Jason Gustafson created KAFKA-4160:
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Summary: Consumer onPartitionsRevoked should not be invoked while
holding the coordinator lock
Key: KAFKA-4160
URL: https://issues.apache.org/jira/browse/KAFKA-4160
Project: Kafka
Issue Type: Bug
Components: consumer
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Priority: Blocker
Fix For: 0.10.1.0
We have a single lock which is used for protecting access to shared coordinator
state between the foreground thread and the background heartbeat thread.
Currently, the onPartitionsRevoked callback is invoked while holding this lock,
which prevents the heartbeat thread from sending any heartbeats. If the
heartbeat thread is blocked for longer than the session timeout, than the
consumer is kicked out of the group. Typically this is not a problem because
onPartitionsRevoked might only commit offsets, but for Kafka Streams, there is
some expensive cleanup logic which can take longer than the session timeout.
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