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https://issues.apache.org/jira/browse/FLINK-28942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-28942:
-----------------------------------
Labels: pull-request-available (was: )
> Deadlock may occurs when releasing readers for SortMergeResultPartition
> -----------------------------------------------------------------------
>
> Key: FLINK-28942
> URL: https://issues.apache.org/jira/browse/FLINK-28942
> Project: Flink
> Issue Type: Bug
> Affects Versions: 1.16.0
> Reporter: Yuxin Tan
> Priority: Major
> Labels: pull-request-available
>
> After adding the logic of recycling buffers in CompositeBuffer in
> https://issues.apache.org/jira/browse/FLINK-28373, when reading data and
> recycling buffers simultaneously, the deadlock between the lock of
> SortMergeResultPartition and the lock of SingleInputGate may occur.
> In short, the deadlock may occur as follows.
> 1. SingleInputGate.getNextBufferOrEvent (SingleInputGate lock)
> CompositeBuffer.getFullBufferData -> CompositeBuffer.recycleBuffer -> waiting
> for
> SortMergeResultPartition lock;
> 2. ResultPartitionManager.releasePartition (SortMergeResultPartition lock) ->
> SortMergeSubpartitionReader.notifyDataAvailable ->
> SingleInputGate.notifyChannelNonEmpty -> waiting for SingleInputGate lock.
> The possibility of this deadlock is very small, but we should fix the bug as
> soon as possible.
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