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Posted to dev@kafka.apache.org by "Jun Rao (JIRA)" <ji...@apache.org> on 2013/06/09 17:26:20 UTC

[jira] [Created] (KAFKA-937) ConsumerFetcherThread can deadlock

Jun Rao created KAFKA-937:
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             Summary: ConsumerFetcherThread can deadlock
                 Key: KAFKA-937
                 URL: https://issues.apache.org/jira/browse/KAFKA-937
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8
            Reporter: Jun Rao
            Assignee: Jun Rao


We have the following access pattern that can introduce a deadlock.

AbstractFetcherThread.processPartitionsWithError() ->
ConsumerFetcherThread.processPartitionsWithError() -> 
ConsumerFetcherManager.addPartitionsWithError() wait for lock ->
LeaderFinderThread holding lock while calling AbstractFetcherManager.shutdownIdleFetcherThreads() ->
AbstractFetcherManager calling fetcher.shutdown, which needs to wait until AbstractFetcherThread.processPartitionsWithError() completes.

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