Chapter 6. MirrorMaker configuration properties

Type: string
Default: null
Importance: high

A list of host/port pairs used to establish the initial connection to the Kafka cluster. Clients use this list to bootstrap and discover the full set of Kafka brokers. While the order of servers in the list does not matter, we recommend including more than one server to ensure resilience if any servers are down. This list does not need to contain the entire set of brokers, as Kafka clients automatically manage and update connections to the cluster efficiently. This list must be in the form host1:port1,host2:port2,…​.

Type: password
Default: null
Importance: high

The password of the private key in the key store file or the PEM key specified in 'ssl.keystore.key'.

Type: password
Default: null
Importance: high

Certificate chain in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with a list of X.509 certificates.

Type: password
Default: null
Importance: high

Private key in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with PKCS#8 keys. If the key is encrypted, key password must be specified using 'ssl.key.password'.

Type: string
Default: null
Importance: high

The location of the key store file. This is optional for client and can be used for two-way authentication for client.

Type: password
Default: null
Importance: high

The store password for the key store file. This is optional for client and only needed if 'ssl.keystore.location' is configured. Key store password is not supported for PEM format.

Type: password
Default: null
Importance: high

Trusted certificates in the format specified by 'ssl.truststore.type'. Default SSL engine factory supports only PEM format with X.509 certificates.

Type: string
Default: null
Importance: high

The location of the trust store file.

Type: password
Default: null
Importance: high

The password for the trust store file. If a password is not set, trust store file configured will still be used, but integrity checking is disabled. Trust store password is not supported for PEM format.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface.

Type: password
Default: null
Importance: medium

JAAS login context parameters for SASL connections in the format used by JAAS configuration files. JAAS configuration file format is described here. The format for the value is: loginModuleClass controlFlag (optionName=optionValue)*;. For brokers, the config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.jaas.config=com.example.ScramLoginModule required;.

Type: string
Default: null
Importance: medium

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL login callback handler class that implements the AuthenticateCallbackHandler interface. For brokers, login callback handler config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.callback.handler.class=com.example.CustomScramLoginCallbackHandler.

Type: class
Default: null
Importance: medium

The fully qualified name of a class that implements the Login interface. For brokers, login config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLogin.

Type: string
Default: GSSAPI
Importance: medium

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: null
Importance: medium

The OAuth/OIDC provider URL from which the provider’s JWKS (JSON Web Key Set) can be retrieved. The URL can be HTTP(S)-based or file-based. If the URL is HTTP(S)-based, the JWKS data will be retrieved from the OAuth/OIDC provider via the configured URL on broker startup. All then-current keys will be cached on the broker for incoming requests. If an authentication request is received for a JWT that includes a "kid" header claim value that isn’t yet in the cache, the JWKS endpoint will be queried again on demand. However, the broker polls the URL every sasl.oauthbearer.jwks.endpoint.refresh.ms milliseconds to refresh the cache with any forthcoming keys before any JWT requests that include them are received. If the URL is file-based, the broker will load the JWKS file from a configured location on startup. In the event that the JWT includes a "kid" header value that isn’t in the JWKS file, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: medium

The URL for the OAuth/OIDC identity provider. If the URL is HTTP(S)-based, it is the issuer’s token endpoint URL to which requests will be made to login based on the configuration in sasl.jaas.config. If the URL is file-based, it specifies a file containing an access token (in JWT serialized form) issued by the OAuth/OIDC identity provider to use for authorization.

Type: string
Default: PLAINTEXT
Valid Values: (case insensitive) [SASL_SSL, PLAINTEXT, SSL, SASL_PLAINTEXT]
Importance: medium

Protocol used to communicate with brokers.

Type: list
Default: TLSv1.2,TLSv1.3
Importance: medium

The list of protocols enabled for SSL connections. The default is 'TLSv1.2,TLSv1.3'. This means that clients and servers will prefer TLSv1.3 if both support it and fallback to TLSv1.2 otherwise (assuming both support at least TLSv1.2). This default should be fine for most use cases. Also see the config documentation for ssl.protocol to understand how it can impact the TLS version negotiation behavior.

Type: string
Default: JKS
Importance: medium

The file format of the key store file. This is optional for client. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: string
Default: TLSv1.3
Importance: medium

The SSL protocol used to generate the SSLContext. The default is 'TLSv1.3', which should be fine for most use cases. A typical alternative to the default is 'TLSv1.2'. Allowed values for this config are dependent on the JVM. Clients using the defaults for this config and 'ssl.enabled.protocols' will downgrade to 'TLSv1.2' if the server does not support 'TLSv1.3'. If this config is set to 'TLSv1.2', however, clients will not use 'TLSv1.3' even if it is one of the values in ssl.enabled.protocols and the server only supports 'TLSv1.3'.

Type: string
Default: null
Importance: medium

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: JKS
Importance: medium

The file format of the trust store file. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: class
Default: org.apache.kafka.clients.admin.ForwardingAdmin
Importance: low

Class which extends ForwardingAdmin to define custom cluster resource management (topics, configs, etc). The class must have a constructor with signature (Map<String, Object> config) that is used to configure a KafkaAdminClient and may also be used to configure clients for external systems if necessary.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultReplicationPolicy
Importance: low

Class which defines the remote topic naming convention.

Type: boolean
Default: true
Importance: low

Whether to use replication.policy.separator to control the names of topics used for checkpoints and offset syncs. By default, custom separators are used in these topic names; however, if upgrading MirrorMaker 2 from older versions that did not allow for these topic names to be customized, it may be necessary to set this property to 'false' in order to continue using the same names for those topics.

Type: string
Default: .
Importance: low

Separator used in remote topic naming convention.

Type: string
Default: /usr/bin/kinit
Importance: low

Kerberos kinit command path.

Type: long
Default: 60000
Importance: low

Login thread sleep time between refresh attempts.

Type: double
Default: 0.05
Importance: low

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.8
Importance: low

Login thread will sleep until the specified window factor of time from last refresh to ticket’s expiry has been reached, at which time it will try to renew the ticket.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider connection timeout. Currently applies only to OAUTHBEARER.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider read timeout. Currently applies only to OAUTHBEARER.

Type: short
Default: 300
Valid Values: [0,…​,3600]
Importance: low

The amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. If a refresh would otherwise occur closer to expiration than the number of buffer seconds then the refresh will be moved up to maintain as much of the buffer time as possible. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: short
Default: 60
Valid Values: [0,…​,900]
Importance: low

The desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. Legal values are between 0 and 900 (15 minutes); a default value of 60 (1 minute) is used if no value is specified. This value and sasl.login.refresh.buffer.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.8
Valid Values: [0.5,…​,1.0]
Importance: low

Login refresh thread will sleep until the specified window factor relative to the credential’s lifetime has been reached, at which time it will try to refresh the credential. Legal values are between 0.5 (50%) and 1.0 (100%) inclusive; a default value of 0.8 (80%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.05
Valid Values: [0.0,…​,0.25]
Importance: low

The maximum amount of random jitter relative to the credential’s lifetime that is added to the login refresh thread’s sleep time. Legal values are between 0 and 0.25 (25%) inclusive; a default value of 0.05 (5%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: int
Default: 30
Importance: low

The (optional) value in seconds to allow for differences between the time of the OAuth/OIDC identity provider and the broker.

Type: list
Default: null
Importance: low

The (optional) comma-delimited setting for the broker to use to verify that the JWT was issued for one of the expected audiences. The JWT will be inspected for the standard OAuth "aud" claim and if this value is set, the broker will match the value from JWT’s "aud" claim to see if there is an exact match. If there is no match, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: low

The (optional) setting for the broker to use to verify that the JWT was created by the expected issuer. The JWT will be inspected for the standard OAuth "iss" claim and if this value is set, the broker will match it exactly against what is in the JWT’s "iss" claim. If there is no match, the broker will reject the JWT and authentication will fail.

Type: boolean
Default: false
Importance: low

The (optional) setting to enable the OAuth client to URL-encode the client_id and client_secret in the authorization header in accordance with RFC6749, see here for more details. The default value is set to 'false' for backward compatibility.

Type: long
Default: 3600000 (1 hour)
Importance: low

The (optional) value in milliseconds for the broker to wait between refreshing its JWKS (JSON Web Key Set) cache that contains the keys to verify the signature of the JWT.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between attempts to retrieve the JWKS (JSON Web Key Set) from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between JWKS (JSON Web Key Set) retrieval attempts from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: string
Default: scope
Importance: low

The OAuth claim for the scope is often named "scope", but this (optional) setting can provide a different name to use for the scope included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: string
Default: sub
Importance: low

The OAuth claim for the subject is often named "sub", but this (optional) setting can provide a different name to use for the subject included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: list
Default: null
Importance: low

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: string
Default: https
Importance: low

The endpoint identification algorithm to validate server hostname using server certificate.

Type: class
Default: null
Importance: low

The class of type org.apache.kafka.common.security.auth.SslEngineFactory to provide SSLEngine objects. Default value is org.apache.kafka.common.security.ssl.DefaultSslEngineFactory. Alternatively, setting this to org.apache.kafka.common.security.ssl.CommonNameLoggingSslEngineFactory will log the common name of expired SSL certificates used by clients to authenticate at any of the brokers with log level INFO. Note that this will cause a tiny delay during establishment of new connections from mTLS clients to brokers due to the extra code for examining the certificate chain provided by the client. Note further that the implementation uses a custom truststore based on the standard Java truststore and thus might be considered a security risk due to not being as mature as the standard one.

Type: string
Default: SunX509
Importance: low

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: null
Importance: low

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: PKIX
Importance: low

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: string
Importance: high

Alias of source cluster.

Type: list
Default: follower\.replication\.throttled\.replicas,leader\.replication\.throttled\.replicas,message\.timestamp\.difference\.max\.ms,message\.timestamp\.type,unclean\.leader\.election\.enable,min\.insync\.replicas
Importance: high

Topic config properties that should not be replicated. Supports comma-separated property names and regexes.

Type: password
Default: null
Importance: high

The password of the private key in the key store file or the PEM key specified in 'ssl.keystore.key'.

Type: password
Default: null
Importance: high

Certificate chain in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with a list of X.509 certificates.

Type: password
Default: null
Importance: high

Private key in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with PKCS#8 keys. If the key is encrypted, key password must be specified using 'ssl.key.password'.

Type: string
Default: null
Importance: high

The location of the key store file. This is optional for client and can be used for two-way authentication for client.

Type: password
Default: null
Importance: high

The store password for the key store file. This is optional for client and only needed if 'ssl.keystore.location' is configured. Key store password is not supported for PEM format.

Type: password
Default: null
Importance: high

Trusted certificates in the format specified by 'ssl.truststore.type'. Default SSL engine factory supports only PEM format with X.509 certificates.

Type: string
Default: null
Importance: high

The location of the trust store file.

Type: password
Default: null
Importance: high

The password for the trust store file. If a password is not set, trust store file configured will still be used, but integrity checking is disabled. Trust store password is not supported for PEM format.

Type: string
Default: target
Importance: high

Alias of target cluster. Used in metrics reporting.

Type: list
Default: .*
Importance: high

Topics to replicate. Supports comma-separated topic names and regexes.

Type: list
Default: mm2.\.internal,.\.replica,__.*
Importance: high

Excluded topics. Supports comma-separated topic names and regexes. Excludes take precedence over includes.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface.

Type: password
Default: null
Importance: medium

JAAS login context parameters for SASL connections in the format used by JAAS configuration files. JAAS configuration file format is described here. The format for the value is: loginModuleClass controlFlag (optionName=optionValue)*;. For brokers, the config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.jaas.config=com.example.ScramLoginModule required;.

Type: string
Default: null
Importance: medium

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL login callback handler class that implements the AuthenticateCallbackHandler interface. For brokers, login callback handler config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.callback.handler.class=com.example.CustomScramLoginCallbackHandler.

Type: class
Default: null
Importance: medium

The fully qualified name of a class that implements the Login interface. For brokers, login config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLogin.

Type: string
Default: GSSAPI
Importance: medium

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: null
Importance: medium

The OAuth/OIDC provider URL from which the provider’s JWKS (JSON Web Key Set) can be retrieved. The URL can be HTTP(S)-based or file-based. If the URL is HTTP(S)-based, the JWKS data will be retrieved from the OAuth/OIDC provider via the configured URL on broker startup. All then-current keys will be cached on the broker for incoming requests. If an authentication request is received for a JWT that includes a "kid" header claim value that isn’t yet in the cache, the JWKS endpoint will be queried again on demand. However, the broker polls the URL every sasl.oauthbearer.jwks.endpoint.refresh.ms milliseconds to refresh the cache with any forthcoming keys before any JWT requests that include them are received. If the URL is file-based, the broker will load the JWKS file from a configured location on startup. In the event that the JWT includes a "kid" header value that isn’t in the JWKS file, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: medium

The URL for the OAuth/OIDC identity provider. If the URL is HTTP(S)-based, it is the issuer’s token endpoint URL to which requests will be made to login based on the configuration in sasl.jaas.config. If the URL is file-based, it specifies a file containing an access token (in JWT serialized form) issued by the OAuth/OIDC identity provider to use for authorization.

Type: string
Default: PLAINTEXT
Valid Values: (case insensitive) [SASL_SSL, PLAINTEXT, SSL, SASL_PLAINTEXT]
Importance: medium

Protocol used to communicate with brokers.

Type: list
Default: TLSv1.2,TLSv1.3
Importance: medium

The list of protocols enabled for SSL connections. The default is 'TLSv1.2,TLSv1.3'. This means that clients and servers will prefer TLSv1.3 if both support it and fallback to TLSv1.2 otherwise (assuming both support at least TLSv1.2). This default should be fine for most use cases. Also see the config documentation for ssl.protocol to understand how it can impact the TLS version negotiation behavior.

Type: string
Default: JKS
Importance: medium

The file format of the key store file. This is optional for client. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: string
Default: TLSv1.3
Importance: medium

The SSL protocol used to generate the SSLContext. The default is 'TLSv1.3', which should be fine for most use cases. A typical alternative to the default is 'TLSv1.2'. Allowed values for this config are dependent on the JVM. Clients using the defaults for this config and 'ssl.enabled.protocols' will downgrade to 'TLSv1.2' if the server does not support 'TLSv1.3'. If this config is set to 'TLSv1.2', however, clients will not use 'TLSv1.3' even if it is one of the values in ssl.enabled.protocols and the server only supports 'TLSv1.3'.

Type: string
Default: null
Importance: medium

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: JKS
Importance: medium

The file format of the trust store file. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: long
Default: 60000 (1 minute)
Importance: low

Timeout for administrative tasks, e.g. detecting new topics.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultConfigPropertyFilter
Importance: low

ConfigPropertyFilter to use. Selects topic config properties to replicate.

Type: long
Default: 1000 (1 second)
Importance: low

Timeout when polling source cluster.

Type: boolean
Default: true
Importance: low

Whether to store the new offset of the replicated records in offset-syncs topic or not. MirrorCheckpointConnector will not be able to sync group offsets or emit checkpoints if emit.checkpoints.enabled and/or sync.group.offsets.enabled are enabled while emit.offset-syncs.enabled is disabled.

Type: boolean
Default: true
Importance: low

Whether to replicate source→target.

Type: class
Default: org.apache.kafka.clients.admin.ForwardingAdmin
Importance: low

Class which extends ForwardingAdmin to define custom cluster resource management (topics, configs, etc). The class must have a constructor with signature (Map<String, Object> config) that is used to configure a KafkaAdminClient and may also be used to configure clients for external systems if necessary.

Type: boolean
Default: true
Importance: low

Whether to replicate the heartbeats topics even when the topic filter does not include them. If set to true, heartbeats topics identified by the replication policy will always be replicated, regardless of the topic filter configuration. If set to false, heartbeats topics will only be replicated if the topic filter allows.

Type: list
Default: org.apache.kafka.common.metrics.JmxReporter
Importance: low

A list of classes to use as metrics reporters. Implementing the org.apache.kafka.common.metrics.MetricsReporter interface allows plugging in classes that will be notified of new metric creation.

Type: string
Default: source
Valid Values: [source, target]
Importance: low

The location (source/target) of the offset-syncs topic.

Type: short
Default: 3
Importance: low

Replication factor for offset-syncs topic.

Type: long
Default: 100
Importance: low

How out-of-sync a remote partition can be before it is resynced.

Type: boolean
Default: true
Importance: low

Whether to periodically check for new topics and partitions.

Type: long
Default: 600
Importance: low

Frequency of topic refresh.

Type: int
Default: 2
Importance: low

Replication factor for newly created remote topics.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultReplicationPolicy
Importance: low

Class which defines the remote topic naming convention.

Type: boolean
Default: true
Importance: low

Whether to use replication.policy.separator to control the names of topics used for checkpoints and offset syncs. By default, custom separators are used in these topic names; however, if upgrading MirrorMaker 2 from older versions that did not allow for these topic names to be customized, it may be necessary to set this property to 'false' in order to continue using the same names for those topics.

Type: string
Default: .
Importance: low

Separator used in remote topic naming convention.

Type: string
Default: /usr/bin/kinit
Importance: low

Kerberos kinit command path.

Type: long
Default: 60000
Importance: low

Login thread sleep time between refresh attempts.

Type: double
Default: 0.05
Importance: low

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.8
Importance: low

Login thread will sleep until the specified window factor of time from last refresh to ticket’s expiry has been reached, at which time it will try to renew the ticket.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider connection timeout. Currently applies only to OAUTHBEARER.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider read timeout. Currently applies only to OAUTHBEARER.

Type: short
Default: 300
Valid Values: [0,…​,3600]
Importance: low

The amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. If a refresh would otherwise occur closer to expiration than the number of buffer seconds then the refresh will be moved up to maintain as much of the buffer time as possible. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: short
Default: 60
Valid Values: [0,…​,900]
Importance: low

The desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. Legal values are between 0 and 900 (15 minutes); a default value of 60 (1 minute) is used if no value is specified. This value and sasl.login.refresh.buffer.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.8
Valid Values: [0.5,…​,1.0]
Importance: low

Login refresh thread will sleep until the specified window factor relative to the credential’s lifetime has been reached, at which time it will try to refresh the credential. Legal values are between 0.5 (50%) and 1.0 (100%) inclusive; a default value of 0.8 (80%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.05
Valid Values: [0.0,…​,0.25]
Importance: low

The maximum amount of random jitter relative to the credential’s lifetime that is added to the login refresh thread’s sleep time. Legal values are between 0 and 0.25 (25%) inclusive; a default value of 0.05 (5%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: int
Default: 30
Importance: low

The (optional) value in seconds to allow for differences between the time of the OAuth/OIDC identity provider and the broker.

Type: list
Default: null
Importance: low

The (optional) comma-delimited setting for the broker to use to verify that the JWT was issued for one of the expected audiences. The JWT will be inspected for the standard OAuth "aud" claim and if this value is set, the broker will match the value from JWT’s "aud" claim to see if there is an exact match. If there is no match, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: low

The (optional) setting for the broker to use to verify that the JWT was created by the expected issuer. The JWT will be inspected for the standard OAuth "iss" claim and if this value is set, the broker will match it exactly against what is in the JWT’s "iss" claim. If there is no match, the broker will reject the JWT and authentication will fail.

Type: boolean
Default: false
Importance: low

The (optional) setting to enable the OAuth client to URL-encode the client_id and client_secret in the authorization header in accordance with RFC6749, see here for more details. The default value is set to 'false' for backward compatibility.

Type: long
Default: 3600000 (1 hour)
Importance: low

The (optional) value in milliseconds for the broker to wait between refreshing its JWKS (JSON Web Key Set) cache that contains the keys to verify the signature of the JWT.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between attempts to retrieve the JWKS (JSON Web Key Set) from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between JWKS (JSON Web Key Set) retrieval attempts from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: string
Default: scope
Importance: low

The OAuth claim for the scope is often named "scope", but this (optional) setting can provide a different name to use for the scope included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: string
Default: sub
Importance: low

The OAuth claim for the subject is often named "sub", but this (optional) setting can provide a different name to use for the subject included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: list
Default: null
Importance: low

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: string
Default: https
Importance: low

The endpoint identification algorithm to validate server hostname using server certificate.

Type: class
Default: null
Importance: low

The class of type org.apache.kafka.common.security.auth.SslEngineFactory to provide SSLEngine objects. Default value is org.apache.kafka.common.security.ssl.DefaultSslEngineFactory. Alternatively, setting this to org.apache.kafka.common.security.ssl.CommonNameLoggingSslEngineFactory will log the common name of expired SSL certificates used by clients to authenticate at any of the brokers with log level INFO. Note that this will cause a tiny delay during establishment of new connections from mTLS clients to brokers due to the extra code for examining the certificate chain provided by the client. Note further that the implementation uses a custom truststore based on the standard Java truststore and thus might be considered a security risk due to not being as mature as the standard one.

Type: string
Default: SunX509
Importance: low

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: null
Importance: low

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: PKIX
Importance: low

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: boolean
Default: true
Importance: low

Whether to periodically configure remote topic ACLs to match their corresponding upstream topics.

Type: long
Default: 600
Importance: low

Frequency of topic ACL sync.

Type: boolean
Default: true
Importance: low

Whether to periodically configure remote topics to match their corresponding upstream topics.

Type: long
Default: 600
Importance: low

Frequency of topic config sync.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultTopicFilter
Importance: low

TopicFilter to use. Selects topics to replicate.

Type: string
Valid Values: non-empty string without ISO control characters
Importance: high

Globally unique name to use for this connector.

Type: string
Importance: high

Name or alias of the class for this connector. Must be a subclass of org.apache.kafka.connect.connector.Connector. If the connector is org.apache.kafka.connect.file.FileStreamSinkConnector, you can either specify this full name, or use "FileStreamSink" or "FileStreamSinkConnector" to make the configuration a bit shorter.

Type: int
Default: 1
Valid Values: [1,…​]
Importance: high

Maximum number of tasks to use for this connector.

Type: boolean
Default: true
Importance: low

(Deprecated) Whether to enforce that the tasks.max property is respected by the connector. By default, connectors that generate too many tasks will fail, and existing sets of tasks that exceed the tasks.max property will also be failed. If this property is set to false, then connectors will be allowed to generate more than the maximum number of tasks, and existing sets of tasks that exceed the tasks.max property will be allowed to run. This property is deprecated and will be removed in an upcoming major release.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the keys in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.HeaderConverter, A class with a public, no-argument constructor
Importance: low

HeaderConverter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the header values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro. By default, the SimpleHeaderConverter is used to serialize header values to strings and deserialize them by inferring the schemas.

Type: string
Default: restart
Valid Values: [none, restart]
Importance: low

The action that Connect should take on the connector when changes in external configuration providers result in a change in the connector’s configuration properties. A value of 'none' indicates that Connect will do nothing. A value of 'restart' indicates that Connect should restart/reload the connector with the updated configuration properties.The restart may actually be scheduled in the future if the external configuration provider indicates that a configuration value will expire in the future.

Type: list
Default: ""
Valid Values: non-null string, unique transformation aliases
Importance: low

Aliases for the transformations to be applied to records.

Type: list
Default: ""
Valid Values: non-null string, unique predicate aliases
Importance: low

Aliases for the predicates used by transformations.

Type: long
Default: 0
Importance: medium

The maximum duration in milliseconds that a failed operation will be reattempted. The default is 0, which means no retries will be attempted. Use -1 for infinite retries.

Type: long
Default: 60000 (1 minute)
Importance: medium

The maximum duration in milliseconds between consecutive retry attempts. Jitter will be added to the delay once this limit is reached to prevent thundering herd issues.

Type: string
Default: none
Valid Values: [none, all]
Importance: medium

Behavior for tolerating errors during connector operation. 'none' is the default value and signals that any error will result in an immediate connector task failure; 'all' changes the behavior to skip over problematic records.

Type: boolean
Default: false
Importance: medium

If true, write each error and the details of the failed operation and problematic record to the Connect application log. This is 'false' by default, so that only errors that are not tolerated are reported.

Type: boolean
Default: false
Importance: medium

Whether to include in the log the Connect record that resulted in a failure. For sink records, the topic, partition, offset, and timestamp will be logged. For source records, the key and value (and their schemas), all headers, and the timestamp, Kafka topic, Kafka partition, source partition, and source offset will be logged. This is 'false' by default, which will prevent record keys, values, and headers from being written to log files.

Type: string
Importance: high

Alias of source cluster.

Type: list
Default: .*
Importance: high

Consumer groups to replicate. Supports comma-separated group IDs and regexes.

Type: list
Default: console-consumer-.,connect-.,__.*
Importance: high

Exclude groups. Supports comma-separated group IDs and regexes. Excludes take precedence over includes.

Type: password
Default: null
Importance: high

The password of the private key in the key store file or the PEM key specified in 'ssl.keystore.key'.

Type: password
Default: null
Importance: high

Certificate chain in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with a list of X.509 certificates.

Type: password
Default: null
Importance: high

Private key in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with PKCS#8 keys. If the key is encrypted, key password must be specified using 'ssl.key.password'.

Type: string
Default: null
Importance: high

The location of the key store file. This is optional for client and can be used for two-way authentication for client.

Type: password
Default: null
Importance: high

The store password for the key store file. This is optional for client and only needed if 'ssl.keystore.location' is configured. Key store password is not supported for PEM format.

Type: password
Default: null
Importance: high

Trusted certificates in the format specified by 'ssl.truststore.type'. Default SSL engine factory supports only PEM format with X.509 certificates.

Type: string
Default: null
Importance: high

The location of the trust store file.

Type: password
Default: null
Importance: high

The password for the trust store file. If a password is not set, trust store file configured will still be used, but integrity checking is disabled. Trust store password is not supported for PEM format.

Type: string
Default: target
Importance: high

Alias of target cluster. Used in metrics reporting.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface.

Type: password
Default: null
Importance: medium

JAAS login context parameters for SASL connections in the format used by JAAS configuration files. JAAS configuration file format is described here. The format for the value is: loginModuleClass controlFlag (optionName=optionValue)*;. For brokers, the config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.jaas.config=com.example.ScramLoginModule required;.

Type: string
Default: null
Importance: medium

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL login callback handler class that implements the AuthenticateCallbackHandler interface. For brokers, login callback handler config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.callback.handler.class=com.example.CustomScramLoginCallbackHandler.

Type: class
Default: null
Importance: medium

The fully qualified name of a class that implements the Login interface. For brokers, login config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLogin.

Type: string
Default: GSSAPI
Importance: medium

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: null
Importance: medium

The OAuth/OIDC provider URL from which the provider’s JWKS (JSON Web Key Set) can be retrieved. The URL can be HTTP(S)-based or file-based. If the URL is HTTP(S)-based, the JWKS data will be retrieved from the OAuth/OIDC provider via the configured URL on broker startup. All then-current keys will be cached on the broker for incoming requests. If an authentication request is received for a JWT that includes a "kid" header claim value that isn’t yet in the cache, the JWKS endpoint will be queried again on demand. However, the broker polls the URL every sasl.oauthbearer.jwks.endpoint.refresh.ms milliseconds to refresh the cache with any forthcoming keys before any JWT requests that include them are received. If the URL is file-based, the broker will load the JWKS file from a configured location on startup. In the event that the JWT includes a "kid" header value that isn’t in the JWKS file, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: medium

The URL for the OAuth/OIDC identity provider. If the URL is HTTP(S)-based, it is the issuer’s token endpoint URL to which requests will be made to login based on the configuration in sasl.jaas.config. If the URL is file-based, it specifies a file containing an access token (in JWT serialized form) issued by the OAuth/OIDC identity provider to use for authorization.

Type: string
Default: PLAINTEXT
Valid Values: (case insensitive) [SASL_SSL, PLAINTEXT, SSL, SASL_PLAINTEXT]
Importance: medium

Protocol used to communicate with brokers.

Type: list
Default: TLSv1.2,TLSv1.3
Importance: medium

The list of protocols enabled for SSL connections. The default is 'TLSv1.2,TLSv1.3'. This means that clients and servers will prefer TLSv1.3 if both support it and fallback to TLSv1.2 otherwise (assuming both support at least TLSv1.2). This default should be fine for most use cases. Also see the config documentation for ssl.protocol to understand how it can impact the TLS version negotiation behavior.

Type: string
Default: JKS
Importance: medium

The file format of the key store file. This is optional for client. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: string
Default: TLSv1.3
Importance: medium

The SSL protocol used to generate the SSLContext. The default is 'TLSv1.3', which should be fine for most use cases. A typical alternative to the default is 'TLSv1.2'. Allowed values for this config are dependent on the JVM. Clients using the defaults for this config and 'ssl.enabled.protocols' will downgrade to 'TLSv1.2' if the server does not support 'TLSv1.3'. If this config is set to 'TLSv1.2', however, clients will not use 'TLSv1.3' even if it is one of the values in ssl.enabled.protocols and the server only supports 'TLSv1.3'.

Type: string
Default: null
Importance: medium

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: JKS
Importance: medium

The file format of the trust store file. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: long
Default: 60000 (1 minute)
Importance: low

Timeout for administrative tasks, e.g. detecting new topics.

Type: short
Default: 3
Importance: low

Replication factor for checkpoints topic.

Type: long
Default: 1000 (1 second)
Importance: low

Timeout when polling source cluster.

Type: boolean
Default: true
Importance: low

Whether to replicate consumer offsets to target cluster.

Type: long
Default: 60
Importance: low

Frequency of checkpoints.

Type: boolean
Default: true
Importance: low

Whether to replicate source→target.

Type: class
Default: org.apache.kafka.clients.admin.ForwardingAdmin
Importance: low

Class which extends ForwardingAdmin to define custom cluster resource management (topics, configs, etc). The class must have a constructor with signature (Map<String, Object> config) that is used to configure a KafkaAdminClient and may also be used to configure clients for external systems if necessary.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultGroupFilter
Importance: low

GroupFilter to use. Selects consumer groups to replicate.

Type: list
Default: org.apache.kafka.common.metrics.JmxReporter
Importance: low

A list of classes to use as metrics reporters. Implementing the org.apache.kafka.common.metrics.MetricsReporter interface allows plugging in classes that will be notified of new metric creation.

Type: string
Default: source
Valid Values: [source, target]
Importance: low

The location (source/target) of the offset-syncs topic.

Type: boolean
Default: true
Importance: low

Whether to periodically check for new consumer groups.

Type: long
Default: 600
Importance: low

Frequency of group refresh.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultReplicationPolicy
Importance: low

Class which defines the remote topic naming convention.

Type: boolean
Default: true
Importance: low

Whether to use replication.policy.separator to control the names of topics used for checkpoints and offset syncs. By default, custom separators are used in these topic names; however, if upgrading MirrorMaker 2 from older versions that did not allow for these topic names to be customized, it may be necessary to set this property to 'false' in order to continue using the same names for those topics.

Type: string
Default: .
Importance: low

Separator used in remote topic naming convention.

Type: string
Default: /usr/bin/kinit
Importance: low

Kerberos kinit command path.

Type: long
Default: 60000
Importance: low

Login thread sleep time between refresh attempts.

Type: double
Default: 0.05
Importance: low

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.8
Importance: low

Login thread will sleep until the specified window factor of time from last refresh to ticket’s expiry has been reached, at which time it will try to renew the ticket.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider connection timeout. Currently applies only to OAUTHBEARER.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider read timeout. Currently applies only to OAUTHBEARER.

Type: short
Default: 300
Valid Values: [0,…​,3600]
Importance: low

The amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. If a refresh would otherwise occur closer to expiration than the number of buffer seconds then the refresh will be moved up to maintain as much of the buffer time as possible. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: short
Default: 60
Valid Values: [0,…​,900]
Importance: low

The desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. Legal values are between 0 and 900 (15 minutes); a default value of 60 (1 minute) is used if no value is specified. This value and sasl.login.refresh.buffer.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.8
Valid Values: [0.5,…​,1.0]
Importance: low

Login refresh thread will sleep until the specified window factor relative to the credential’s lifetime has been reached, at which time it will try to refresh the credential. Legal values are between 0.5 (50%) and 1.0 (100%) inclusive; a default value of 0.8 (80%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.05
Valid Values: [0.0,…​,0.25]
Importance: low

The maximum amount of random jitter relative to the credential’s lifetime that is added to the login refresh thread’s sleep time. Legal values are between 0 and 0.25 (25%) inclusive; a default value of 0.05 (5%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: int
Default: 30
Importance: low

The (optional) value in seconds to allow for differences between the time of the OAuth/OIDC identity provider and the broker.

Type: list
Default: null
Importance: low

The (optional) comma-delimited setting for the broker to use to verify that the JWT was issued for one of the expected audiences. The JWT will be inspected for the standard OAuth "aud" claim and if this value is set, the broker will match the value from JWT’s "aud" claim to see if there is an exact match. If there is no match, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: low

The (optional) setting for the broker to use to verify that the JWT was created by the expected issuer. The JWT will be inspected for the standard OAuth "iss" claim and if this value is set, the broker will match it exactly against what is in the JWT’s "iss" claim. If there is no match, the broker will reject the JWT and authentication will fail.

Type: boolean
Default: false
Importance: low

The (optional) setting to enable the OAuth client to URL-encode the client_id and client_secret in the authorization header in accordance with RFC6749, see here for more details. The default value is set to 'false' for backward compatibility.

Type: long
Default: 3600000 (1 hour)
Importance: low

The (optional) value in milliseconds for the broker to wait between refreshing its JWKS (JSON Web Key Set) cache that contains the keys to verify the signature of the JWT.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between attempts to retrieve the JWKS (JSON Web Key Set) from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between JWKS (JSON Web Key Set) retrieval attempts from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: string
Default: scope
Importance: low

The OAuth claim for the scope is often named "scope", but this (optional) setting can provide a different name to use for the scope included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: string
Default: sub
Importance: low

The OAuth claim for the subject is often named "sub", but this (optional) setting can provide a different name to use for the subject included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: list
Default: null
Importance: low

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: string
Default: https
Importance: low

The endpoint identification algorithm to validate server hostname using server certificate.

Type: class
Default: null
Importance: low

The class of type org.apache.kafka.common.security.auth.SslEngineFactory to provide SSLEngine objects. Default value is org.apache.kafka.common.security.ssl.DefaultSslEngineFactory. Alternatively, setting this to org.apache.kafka.common.security.ssl.CommonNameLoggingSslEngineFactory will log the common name of expired SSL certificates used by clients to authenticate at any of the brokers with log level INFO. Note that this will cause a tiny delay during establishment of new connections from mTLS clients to brokers due to the extra code for examining the certificate chain provided by the client. Note further that the implementation uses a custom truststore based on the standard Java truststore and thus might be considered a security risk due to not being as mature as the standard one.

Type: string
Default: SunX509
Importance: low

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: null
Importance: low

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: PKIX
Importance: low

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: boolean
Default: false
Importance: low

Whether to periodically write the translated offsets to __consumer_offsets topic in target cluster, as long as no active consumers in that group are connected to the target cluster.

Type: long
Default: 60
Importance: low

Frequency of consumer group offset sync.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultTopicFilter
Importance: low

TopicFilter to use. Selects topics to replicate.

Type: string
Valid Values: non-empty string without ISO control characters
Importance: high

Globally unique name to use for this connector.

Type: string
Importance: high

Name or alias of the class for this connector. Must be a subclass of org.apache.kafka.connect.connector.Connector. If the connector is org.apache.kafka.connect.file.FileStreamSinkConnector, you can either specify this full name, or use "FileStreamSink" or "FileStreamSinkConnector" to make the configuration a bit shorter.

Type: int
Default: 1
Valid Values: [1,…​]
Importance: high

Maximum number of tasks to use for this connector.

Type: boolean
Default: true
Importance: low

(Deprecated) Whether to enforce that the tasks.max property is respected by the connector. By default, connectors that generate too many tasks will fail, and existing sets of tasks that exceed the tasks.max property will also be failed. If this property is set to false, then connectors will be allowed to generate more than the maximum number of tasks, and existing sets of tasks that exceed the tasks.max property will be allowed to run. This property is deprecated and will be removed in an upcoming major release.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the keys in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.HeaderConverter, A class with a public, no-argument constructor
Importance: low

HeaderConverter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the header values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro. By default, the SimpleHeaderConverter is used to serialize header values to strings and deserialize them by inferring the schemas.

Type: string
Default: restart
Valid Values: [none, restart]
Importance: low

The action that Connect should take on the connector when changes in external configuration providers result in a change in the connector’s configuration properties. A value of 'none' indicates that Connect will do nothing. A value of 'restart' indicates that Connect should restart/reload the connector with the updated configuration properties.The restart may actually be scheduled in the future if the external configuration provider indicates that a configuration value will expire in the future.

Type: list
Default: ""
Valid Values: non-null string, unique transformation aliases
Importance: low

Aliases for the transformations to be applied to records.

Type: list
Default: ""
Valid Values: non-null string, unique predicate aliases
Importance: low

Aliases for the predicates used by transformations.

Type: long
Default: 0
Importance: medium

The maximum duration in milliseconds that a failed operation will be reattempted. The default is 0, which means no retries will be attempted. Use -1 for infinite retries.

Type: long
Default: 60000 (1 minute)
Importance: medium

The maximum duration in milliseconds between consecutive retry attempts. Jitter will be added to the delay once this limit is reached to prevent thundering herd issues.

Type: string
Default: none
Valid Values: [none, all]
Importance: medium

Behavior for tolerating errors during connector operation. 'none' is the default value and signals that any error will result in an immediate connector task failure; 'all' changes the behavior to skip over problematic records.

Type: boolean
Default: false
Importance: medium

If true, write each error and the details of the failed operation and problematic record to the Connect application log. This is 'false' by default, so that only errors that are not tolerated are reported.

Type: boolean
Default: false
Importance: medium

Whether to include in the log the Connect record that resulted in a failure. For sink records, the topic, partition, offset, and timestamp will be logged. For source records, the key and value (and their schemas), all headers, and the timestamp, Kafka topic, Kafka partition, source partition, and source offset will be logged. This is 'false' by default, which will prevent record keys, values, and headers from being written to log files.

Type: string
Importance: high

Alias of source cluster.

Type: password
Default: null
Importance: high

The password of the private key in the key store file or the PEM key specified in 'ssl.keystore.key'.

Type: password
Default: null
Importance: high

Certificate chain in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with a list of X.509 certificates.

Type: password
Default: null
Importance: high

Private key in the format specified by 'ssl.keystore.type'. Default SSL engine factory supports only PEM format with PKCS#8 keys. If the key is encrypted, key password must be specified using 'ssl.key.password'.

Type: string
Default: null
Importance: high

The location of the key store file. This is optional for client and can be used for two-way authentication for client.

Type: password
Default: null
Importance: high

The store password for the key store file. This is optional for client and only needed if 'ssl.keystore.location' is configured. Key store password is not supported for PEM format.

Type: password
Default: null
Importance: high

Trusted certificates in the format specified by 'ssl.truststore.type'. Default SSL engine factory supports only PEM format with X.509 certificates.

Type: string
Default: null
Importance: high

The location of the trust store file.

Type: password
Default: null
Importance: high

The password for the trust store file. If a password is not set, trust store file configured will still be used, but integrity checking is disabled. Trust store password is not supported for PEM format.

Type: string
Default: target
Importance: high

Alias of target cluster. Used in metrics reporting.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL client callback handler class that implements the AuthenticateCallbackHandler interface.

Type: password
Default: null
Importance: medium

JAAS login context parameters for SASL connections in the format used by JAAS configuration files. JAAS configuration file format is described here. The format for the value is: loginModuleClass controlFlag (optionName=optionValue)*;. For brokers, the config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.jaas.config=com.example.ScramLoginModule required;.

Type: string
Default: null
Importance: medium

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: class
Default: null
Importance: medium

The fully qualified name of a SASL login callback handler class that implements the AuthenticateCallbackHandler interface. For brokers, login callback handler config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.callback.handler.class=com.example.CustomScramLoginCallbackHandler.

Type: class
Default: null
Importance: medium

The fully qualified name of a class that implements the Login interface. For brokers, login config must be prefixed with listener prefix and SASL mechanism name in lower-case. For example, listener.name.sasl_ssl.scram-sha-256.sasl.login.class=com.example.CustomScramLogin.

Type: string
Default: GSSAPI
Importance: medium

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: null
Importance: medium

The OAuth/OIDC provider URL from which the provider’s JWKS (JSON Web Key Set) can be retrieved. The URL can be HTTP(S)-based or file-based. If the URL is HTTP(S)-based, the JWKS data will be retrieved from the OAuth/OIDC provider via the configured URL on broker startup. All then-current keys will be cached on the broker for incoming requests. If an authentication request is received for a JWT that includes a "kid" header claim value that isn’t yet in the cache, the JWKS endpoint will be queried again on demand. However, the broker polls the URL every sasl.oauthbearer.jwks.endpoint.refresh.ms milliseconds to refresh the cache with any forthcoming keys before any JWT requests that include them are received. If the URL is file-based, the broker will load the JWKS file from a configured location on startup. In the event that the JWT includes a "kid" header value that isn’t in the JWKS file, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: medium

The URL for the OAuth/OIDC identity provider. If the URL is HTTP(S)-based, it is the issuer’s token endpoint URL to which requests will be made to login based on the configuration in sasl.jaas.config. If the URL is file-based, it specifies a file containing an access token (in JWT serialized form) issued by the OAuth/OIDC identity provider to use for authorization.

Type: string
Default: PLAINTEXT
Valid Values: (case insensitive) [SASL_SSL, PLAINTEXT, SSL, SASL_PLAINTEXT]
Importance: medium

Protocol used to communicate with brokers.

Type: list
Default: TLSv1.2,TLSv1.3
Importance: medium

The list of protocols enabled for SSL connections. The default is 'TLSv1.2,TLSv1.3'. This means that clients and servers will prefer TLSv1.3 if both support it and fallback to TLSv1.2 otherwise (assuming both support at least TLSv1.2). This default should be fine for most use cases. Also see the config documentation for ssl.protocol to understand how it can impact the TLS version negotiation behavior.

Type: string
Default: JKS
Importance: medium

The file format of the key store file. This is optional for client. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: string
Default: TLSv1.3
Importance: medium

The SSL protocol used to generate the SSLContext. The default is 'TLSv1.3', which should be fine for most use cases. A typical alternative to the default is 'TLSv1.2'. Allowed values for this config are dependent on the JVM. Clients using the defaults for this config and 'ssl.enabled.protocols' will downgrade to 'TLSv1.2' if the server does not support 'TLSv1.3'. If this config is set to 'TLSv1.2', however, clients will not use 'TLSv1.3' even if it is one of the values in ssl.enabled.protocols and the server only supports 'TLSv1.3'.

Type: string
Default: null
Importance: medium

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: JKS
Importance: medium

The file format of the trust store file. The values currently supported by the default ssl.engine.factory.class are [JKS, PKCS12, PEM].

Type: long
Default: 60000 (1 minute)
Importance: low

Timeout for administrative tasks, e.g. detecting new topics.

Type: boolean
Default: true
Importance: low

Whether to emit heartbeats to target cluster.

Type: long
Default: 1
Importance: low

Frequency of heartbeats.

Type: boolean
Default: true
Importance: low

Whether to replicate source→target.

Type: class
Default: org.apache.kafka.clients.admin.ForwardingAdmin
Importance: low

Class which extends ForwardingAdmin to define custom cluster resource management (topics, configs, etc). The class must have a constructor with signature (Map<String, Object> config) that is used to configure a KafkaAdminClient and may also be used to configure clients for external systems if necessary.

Type: short
Default: 3
Importance: low

Replication factor for heartbeats topic.

Type: list
Default: org.apache.kafka.common.metrics.JmxReporter
Importance: low

A list of classes to use as metrics reporters. Implementing the org.apache.kafka.common.metrics.MetricsReporter interface allows plugging in classes that will be notified of new metric creation.

Type: class
Default: org.apache.kafka.connect.mirror.DefaultReplicationPolicy
Importance: low

Class which defines the remote topic naming convention.

Type: boolean
Default: true
Importance: low

Whether to use replication.policy.separator to control the names of topics used for checkpoints and offset syncs. By default, custom separators are used in these topic names; however, if upgrading MirrorMaker 2 from older versions that did not allow for these topic names to be customized, it may be necessary to set this property to 'false' in order to continue using the same names for those topics.

Type: string
Default: .
Importance: low

Separator used in remote topic naming convention.

Type: string
Default: /usr/bin/kinit
Importance: low

Kerberos kinit command path.

Type: long
Default: 60000
Importance: low

Login thread sleep time between refresh attempts.

Type: double
Default: 0.05
Importance: low

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.8
Importance: low

Login thread will sleep until the specified window factor of time from last refresh to ticket’s expiry has been reached, at which time it will try to renew the ticket.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider connection timeout. Currently applies only to OAUTHBEARER.

Type: int
Default: null
Importance: low

The (optional) value in milliseconds for the external authentication provider read timeout. Currently applies only to OAUTHBEARER.

Type: short
Default: 300
Valid Values: [0,…​,3600]
Importance: low

The amount of buffer time before credential expiration to maintain when refreshing a credential, in seconds. If a refresh would otherwise occur closer to expiration than the number of buffer seconds then the refresh will be moved up to maintain as much of the buffer time as possible. Legal values are between 0 and 3600 (1 hour); a default value of 300 (5 minutes) is used if no value is specified. This value and sasl.login.refresh.min.period.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: short
Default: 60
Valid Values: [0,…​,900]
Importance: low

The desired minimum time for the login refresh thread to wait before refreshing a credential, in seconds. Legal values are between 0 and 900 (15 minutes); a default value of 60 (1 minute) is used if no value is specified. This value and sasl.login.refresh.buffer.seconds are both ignored if their sum exceeds the remaining lifetime of a credential. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.8
Valid Values: [0.5,…​,1.0]
Importance: low

Login refresh thread will sleep until the specified window factor relative to the credential’s lifetime has been reached, at which time it will try to refresh the credential. Legal values are between 0.5 (50%) and 1.0 (100%) inclusive; a default value of 0.8 (80%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: double
Default: 0.05
Valid Values: [0.0,…​,0.25]
Importance: low

The maximum amount of random jitter relative to the credential’s lifetime that is added to the login refresh thread’s sleep time. Legal values are between 0 and 0.25 (25%) inclusive; a default value of 0.05 (5%) is used if no value is specified. Currently applies only to OAUTHBEARER.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between login attempts to the external authentication provider. Login uses an exponential backoff algorithm with an initial wait based on the sasl.login.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.login.retry.backoff.max.ms setting. Currently applies only to OAUTHBEARER.

Type: int
Default: 30
Importance: low

The (optional) value in seconds to allow for differences between the time of the OAuth/OIDC identity provider and the broker.

Type: list
Default: null
Importance: low

The (optional) comma-delimited setting for the broker to use to verify that the JWT was issued for one of the expected audiences. The JWT will be inspected for the standard OAuth "aud" claim and if this value is set, the broker will match the value from JWT’s "aud" claim to see if there is an exact match. If there is no match, the broker will reject the JWT and authentication will fail.

Type: string
Default: null
Importance: low

The (optional) setting for the broker to use to verify that the JWT was created by the expected issuer. The JWT will be inspected for the standard OAuth "iss" claim and if this value is set, the broker will match it exactly against what is in the JWT’s "iss" claim. If there is no match, the broker will reject the JWT and authentication will fail.

Type: boolean
Default: false
Importance: low

The (optional) setting to enable the OAuth client to URL-encode the client_id and client_secret in the authorization header in accordance with RFC6749, see here for more details. The default value is set to 'false' for backward compatibility.

Type: long
Default: 3600000 (1 hour)
Importance: low

The (optional) value in milliseconds for the broker to wait between refreshing its JWKS (JSON Web Key Set) cache that contains the keys to verify the signature of the JWT.

Type: long
Default: 10000 (10 seconds)
Importance: low

The (optional) value in milliseconds for the maximum wait between attempts to retrieve the JWKS (JSON Web Key Set) from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: long
Default: 100
Importance: low

The (optional) value in milliseconds for the initial wait between JWKS (JSON Web Key Set) retrieval attempts from the external authentication provider. JWKS retrieval uses an exponential backoff algorithm with an initial wait based on the sasl.oauthbearer.jwks.endpoint.retry.backoff.ms setting and will double in wait length between attempts up to a maximum wait length specified by the sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms setting.

Type: string
Default: scope
Importance: low

The OAuth claim for the scope is often named "scope", but this (optional) setting can provide a different name to use for the scope included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: string
Default: sub
Importance: low

The OAuth claim for the subject is often named "sub", but this (optional) setting can provide a different name to use for the subject included in the JWT payload’s claims if the OAuth/OIDC provider uses a different name for that claim.

Type: list
Default: null
Importance: low

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: string
Default: https
Importance: low

The endpoint identification algorithm to validate server hostname using server certificate.

Type: class
Default: null
Importance: low

The class of type org.apache.kafka.common.security.auth.SslEngineFactory to provide SSLEngine objects. Default value is org.apache.kafka.common.security.ssl.DefaultSslEngineFactory. Alternatively, setting this to org.apache.kafka.common.security.ssl.CommonNameLoggingSslEngineFactory will log the common name of expired SSL certificates used by clients to authenticate at any of the brokers with log level INFO. Note that this will cause a tiny delay during establishment of new connections from mTLS clients to brokers due to the extra code for examining the certificate chain provided by the client. Note further that the implementation uses a custom truststore based on the standard Java truststore and thus might be considered a security risk due to not being as mature as the standard one.

Type: string
Default: SunX509
Importance: low

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: null
Importance: low

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: PKIX
Importance: low

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: string
Valid Values: non-empty string without ISO control characters
Importance: high

Globally unique name to use for this connector.

Type: string
Importance: high

Name or alias of the class for this connector. Must be a subclass of org.apache.kafka.connect.connector.Connector. If the connector is org.apache.kafka.connect.file.FileStreamSinkConnector, you can either specify this full name, or use "FileStreamSink" or "FileStreamSinkConnector" to make the configuration a bit shorter.

Type: int
Default: 1
Valid Values: [1,…​]
Importance: high

Maximum number of tasks to use for this connector.

Type: boolean
Default: true
Importance: low

(Deprecated) Whether to enforce that the tasks.max property is respected by the connector. By default, connectors that generate too many tasks will fail, and existing sets of tasks that exceed the tasks.max property will also be failed. If this property is set to false, then connectors will be allowed to generate more than the maximum number of tasks, and existing sets of tasks that exceed the tasks.max property will be allowed to run. This property is deprecated and will be removed in an upcoming major release.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the keys in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.Converter, A class with a public, no-argument constructor
Importance: low

Converter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro.

Type: class
Default: null
Valid Values: A concrete subclass of org.apache.kafka.connect.storage.HeaderConverter, A class with a public, no-argument constructor
Importance: low

HeaderConverter class used to convert between Kafka Connect format and the serialized form that is written to Kafka. This controls the format of the header values in messages written to or read from Kafka, and since this is independent of connectors it allows any connector to work with any serialization format. Examples of common formats include JSON and Avro. By default, the SimpleHeaderConverter is used to serialize header values to strings and deserialize them by inferring the schemas.

Type: string
Default: restart
Valid Values: [none, restart]
Importance: low

The action that Connect should take on the connector when changes in external configuration providers result in a change in the connector’s configuration properties. A value of 'none' indicates that Connect will do nothing. A value of 'restart' indicates that Connect should restart/reload the connector with the updated configuration properties.The restart may actually be scheduled in the future if the external configuration provider indicates that a configuration value will expire in the future.

Type: list
Default: ""
Valid Values: non-null string, unique transformation aliases
Importance: low

Aliases for the transformations to be applied to records.

Type: list
Default: ""
Valid Values: non-null string, unique predicate aliases
Importance: low

Aliases for the predicates used by transformations.

Type: long
Default: 0
Importance: medium

The maximum duration in milliseconds that a failed operation will be reattempted. The default is 0, which means no retries will be attempted. Use -1 for infinite retries.

Type: long
Default: 60000 (1 minute)
Importance: medium

The maximum duration in milliseconds between consecutive retry attempts. Jitter will be added to the delay once this limit is reached to prevent thundering herd issues.

Type: string
Default: none
Valid Values: [none, all]
Importance: medium

Behavior for tolerating errors during connector operation. 'none' is the default value and signals that any error will result in an immediate connector task failure; 'all' changes the behavior to skip over problematic records.

Type: boolean
Default: false
Importance: medium

If true, write each error and the details of the failed operation and problematic record to the Connect application log. This is 'false' by default, so that only errors that are not tolerated are reported.

Type: boolean
Default: false
Importance: medium

Whether to include in the log the Connect record that resulted in a failure. For sink records, the topic, partition, offset, and timestamp will be logged. For source records, the key and value (and their schemas), all headers, and the timestamp, Kafka topic, Kafka partition, source partition, and source offset will be logged. This is 'false' by default, which will prevent record keys, values, and headers from being written to log files.