Jun Rao created KAFKA-1410:
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Summary: MetadataCache cleanup
Key: KAFKA-1410
URL: https://issues.apache.org/jira/browse/KAFKA-1410
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 0.8.2
Reporter: Jun Rao
Assignee: Jun Rao
There are a few remaining cleanup items from KAFKA-1356 for trunk.
1. There is no need to call ensureTopicExists(). A consistent check would
require holding the read lock of metadata cache on every fetch/producer
request, which means a metadata update could block all fetch/producer requests.
Also, this call is just an optimization. When leaderAndIsrRequest is propagated
after a topic deletion, fetch/producer requests will be rejected by the
ReplicaManager.
2. The update of the controller epoc when handling metadata request needs to be
done inside the replicaStateChangeLock.
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