第 11 章 Using Streams for Apache Kafka with MirrorMaker 2
Use MirrorMaker 2 to replicate data between two or more active Kafka clusters, within or across data centers.
To configure MirrorMaker 2, edit the config/connect-mirror-maker.properties configuration file. If required, you can enable distributed tracing for MirrorMaker 2.
Handling high volumes of messages
You can tune the configuration to handle high volumes of messages. For more information, see Handling high volumes of messages.
MirrorMaker 2 has features not supported by the previous version of MirrorMaker. However, you can configure MirrorMaker 2 to be used in legacy mode.
11.1. Configuring active/active or active/passive modes
You can use MirrorMaker 2 in active/passive or active/active cluster configurations.
- active/active cluster configuration
- An active/active configuration has two active clusters replicating data bidirectionally. Applications can use either cluster. Each cluster can provide the same data. In this way, you can make the same data available in different geographical locations. As consumer groups are active in both clusters, consumer offsets for replicated topics are not synchronized back to the source cluster.
- active/passive cluster configuration
- An active/passive configuration has an active cluster replicating data to a passive cluster. The passive cluster remains on standby. You might use the passive cluster for data recovery in the event of system failure.
The expectation is that producers and consumers connect to active clusters only. A MirrorMaker 2 cluster is required at each target destination.
11.1.1. Bidirectional replication (active/active)
The MirrorMaker 2 architecture supports bidirectional replication in an active/active cluster configuration.
Each cluster replicates the data of the other cluster using the concept of source and remote topics. As the same topics are stored in each cluster, remote topics are automatically renamed by MirrorMaker 2 to represent the source cluster. The name of the originating cluster is prepended to the name of the topic.
图 11.1. Topic renaming
By flagging the originating cluster, topics are not replicated back to that cluster.
The concept of replication through remote topics is useful when configuring an architecture that requires data aggregation. Consumers can subscribe to source and remote topics within the same cluster, without the need for a separate aggregation cluster.
11.1.2. Unidirectional replication (active/passive)
The MirrorMaker 2 architecture supports unidirectional replication in an active/passive cluster configuration.
You can use an active/passive cluster configuration to make backups or migrate data to another cluster. In this situation, you might not want automatic renaming of remote topics.
You can override automatic renaming by adding IdentityReplicationPolicy to the source connector configuration. With this configuration applied, topics retain their original names.
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