Chapter 4. Deprecated features
The features deprecated in this release, and that were supported in previous releases of AMQ Streams, are outlined below.
4.1. Java 8 support removed in AMQ Streams 2.4.0
Support for Java 8 was deprecated in AMQ Streams 2.0.0. Support for Java 8 is removed in AMQ Streams 2.4.0. This applies to all AMQ Streams components, including clients.
AMQ Streams supports Java 11. Use Java 11 when developing new applications. Plan to migrate any applications that currently use Java 8 to Java 11.
If you want to continue using Java 8 for the time being, AMQ Streams 2.2 provides Long Term Support (LTS). For information on the LTS terms and dates, see the AMQ Streams LTS Support Policy.
4.2. OpenTracing
Support for OpenTracing is deprecated.
The Jaeger clients are now retired and the OpenTracing project archived. As such, we cannot guarantee their support for future Kafka versions. We are introducing a new tracing implementation based on the OpenTelemetry project.
4.3. Kafka MirrorMaker 2 identity replication policy
Identity replication policy is used with MirrorMaker 2 to override the automatic renaming of remote topics. Instead of prepending the name with the name of the source cluster, the topic retains its original name. This optional setting is useful for active/passive backups and data migration.
To implement an identity replication policy, you specify a replication policy class (replication.policy.class) in the MirrorMaker 2 configuration. The AMQ Streams mirror-maker-2-extensions component, which includes the io.strimzi.kafka.connect.mirror.IdentityReplicationPolicy class, is now deprecated and will be removed in the future. Therefore, it is recommended to update your implementation to use Kafka’s own replication policy class (org.apache.kafka.connect.mirror.IdentityReplicationPolicy).
4.4. Kafka MirrorMaker 1
Kafka MirrorMaker replicates data between two or more active Kafka clusters, within or across data centers. Kafka MirrorMaker 1 was deprecated in Kafka 3.0.0 and will be removed in Kafka 4.0.0. MirrorMaker 2 will be the only version available. MirrorMaker 2 is based on the Kafka Connect framework, connectors managing the transfer of data between clusters.
As a result, MirrorMaker 1 has also been deprecated in AMQ Streams as well. If you are using MirrorMaker 1 (referred to as just MirrorMaker in the AMQ Streams documentation), use MirrorMaker 2 with the IdentityReplicationPolicy class. MirrorMaker 2 renames topics replicated to a target cluster. IdentityReplicationPolicy configuration overrides the automatic renaming. Use it to produce the same active/passive unidirectional replication as MirrorMaker 1.
