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https://issues.apache.org/jira/browse/FLINK-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16658694#comment-16658694
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Till Rohrmann commented on FLINK-9761:
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Thanks for the quick analysis [~zjwang]. Then I think it would be a good idea
to fix this problem for Flink 1.7.
> Potential buffer leak in PartitionRequestClientHandler during job failures
> --------------------------------------------------------------------------
>
> Key: FLINK-9761
> URL: https://issues.apache.org/jira/browse/FLINK-9761
> Project: Flink
> Issue Type: Bug
> Components: Network
> Affects Versions: 1.5.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Critical
> Fix For: 1.5.6, 1.6.3, 1.7.0
>
>
> {{PartitionRequestClientHandler#stagedMessages}} may be accessed from
> multiple threads:
> 1) Netty's IO thread
> 2) During cancellation,
> {{PartitionRequestClientHandler.BufferListenerTask#notifyBufferDestroyed}} is
> called
> If {{PartitionRequestClientHandler.BufferListenerTask#notifyBufferDestroyed}}
> thinks, {{stagesMessages}} is empty, however, it will not install the
> {{stagedMessagesHandler}} that consumes and releases buffers from received
> messages.
> Unless some unexpected combination of code calls prevents this from
> happening, this would leak the non-recycled buffers.
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