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

["Jun Rao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao closed KAFKA-937.
-------------------------


Thanks for the review. Committed the delta patch to 0.8, after fixing the logging.
                
> 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
>             Fix For: 0.8
>
>         Attachments: kafka-937_ConsumerOffsetChecker.patch, kafka-937_delta.patch, kafka-937.patch
>
>
> 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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