Stephan Ewen created FLINK-3595:
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Summary: Kafka09 consumer thread does not interrupt when stuck in
record emission
Key: FLINK-3595
URL: https://issues.apache.org/jira/browse/FLINK-3595
Project: Flink
Issue Type: Bug
Components: Kafka Connector
Affects Versions: 1.0.0
Reporter: Stephan Ewen
Assignee: Stephan Ewen
Priority: Critical
Fix For: 1.1.0, 1.0.1
When canceling a job, the Kafka 0.9 Consumer Thread may be stuck in a blocking
method (output emitting) and never wakes up.
The thread as a whole cannot be simply interrupted, because of a bug in Kafka
that makes the consumer freeze/hang up on interrupt.
There are two possible solutions:
- allow and call interrupt when the consumer thread is emitting elements
- destroy the output network buffer pools eagerly on canceling. The Kafka
thread will then throw an exception if it is stuck in emitting elements and it
will terminate, which is accepted in case the status is canceled.
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