Page History

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• On topic creation
• On topic modification
  • Change in topic config, via AdminClient.alterConfigs() (this change done as part of this KIP).
  • Adding partitions to topics, via AdminClient.createPartitions() (see KIP-195, but this change done as part of this KIP)
  • Reassigning partitions to brokers, and/or changing the replication factor via AdminClient.reassignPartitions() (see KIP-179)
  • KIP-113
• On topic deletion

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Note: Unlike previous policy interfaces the inner RequestMetadata is an interface rather than a class. This should simplify testing and better permit use sites to, for example, lazily fetch metadata when it's actually required by the policy implementation, rather than eagerly fetch information which the policy didn't actually require.

What other policies might there be in future? delete records policy

Deprecate existing policies

The existing CreateTopicPolicy and AlterConfigPolicy will be deprecated, but will continue to be applied when they are configured.

Using create.topic.policy.class.name or  alter.config.policy.class.name will result in an deprecation warning in the broker logs.

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