nateab opened a new pull request, #226:
URL: https://github.com/apache/flink-connector-kafka/pull/226
When multiple KafkaSink subtasks run in the same TaskManager, Kafka
auto-generates identical client.id values for producers, causing
InstanceAlreadyExistsException from JMX MBean registration collisions.
This adds client.id.prefix support to KafkaSink, mirroring the existing
KafkaSource implementation (FLINK-28842):
- Add KafkaSinkOptions with CLIENT_ID_PREFIX config option
- Add KafkaSinkBuilder.setClientIdPrefix() API method
- Auto-generate default prefix from transactionalIdPrefix or random value
- Set per-subtask client.id ({prefix}-{subtaskId}) in restoreWriter() before
passing config to writer constructors
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