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Hang if incremental assign is received while consumer is closing #4527

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4 of 5 tasks
emasab opened this issue Dec 4, 2023 · 3 comments · Fixed by #4528
Closed
4 of 5 tasks

Hang if incremental assign is received while consumer is closing #4527

emasab opened this issue Dec 4, 2023 · 3 comments · Fixed by #4528
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@emasab
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emasab commented Dec 4, 2023

Description

Consumer in cooperative incremental mode will hang if an assignment callback is being processed while it's closing.

How to reproduce

Added a variation 3 to test 0113 to reproduce the bug. The test times out.

Checklist

Please provide the following information:

  • librdkafka version (release number or git tag): master
  • Apache Kafka version: any
  • librdkafka client configuration: any
  • Operating system: any
  • Critical issue
emasab added a commit that referenced this issue Dec 4, 2023
@emasab
Fixes #4527
704c596
@emasab emasab mentioned this issue Dec 4, 2023
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@emasab emasab added the bug label Dec 8, 2023
@mensfeld mensfeld mentioned this issue Jan 10, 2024
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@mensfeld
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@emasab I think this works:

  1. unsubscribe
  2. wait so there are no assignments
  3. close

With this I was not able to hang it.

@mensfeld mensfeld mentioned this issue Jan 11, 2024
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@nhaq-confluent
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@emasab could this issue be closed or should it remain open?

@emasab
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emasab commented Mar 12, 2024

@nhaq-confluent what @mensfeld proposed is a workaround, but we have to review and merge this PR I created
#4528

emasab added a commit that referenced this issue Apr 18, 2024
@emasab
Fixes #4527
e6c75a4
emasab added a commit that referenced this issue Apr 18, 2024
@emasab
Fix hang in incremental assign during close (#4528)
dd1e72d 
While using the cooperative assignor, given an assignment is received while closing the consumer
it's possible that it gets stuck in state WAIT_ASSIGN_CALL, while the method is converted to
a full unassign. Solved by changing state from WAIT_ASSIGN_CALL to WAIT_UNASSIGN_CALL
while doing this conversion.

Closes #4527
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Fix hang in incremental assign during close confluentinc/librdkafka
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@mensfeld @emasab @nhaq-confluent