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https://issues.apache.org/jira/browse/GIRAPH-871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940518#comment-13940518
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Claudio Martella commented on GIRAPH-871:
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OK, i'm committing this one.
> Map task jvm never exits since netty 4 upgrade
> ----------------------------------------------
>
> Key: GIRAPH-871
> URL: https://issues.apache.org/jira/browse/GIRAPH-871
> Project: Giraph
> Issue Type: Bug
> Components: bsp
> Affects Versions: 1.1.0
> Reporter: Craig Muchinsky
> Fix For: 1.1.0
>
> Attachments: GIRAPH-871.patch
>
>
> Some changes made to the NettyClient.stop() logic related to netty 4 are
> causing the final worker thread to hang up indefinitely, preventing the map
> task jvm from exiting. In particular, the call to
> ProgressableUtils.awaitTerminationFuture() is blocking inside the
> ChannelFutureListener callback and deadlocking. Simply moving the
> ProgressableUtils.awaitTerminationFuture() calls outside of the
> ChannelFutureListener callback and placing them at the end of the
> NettyClient.stop() method seems to cure the problem.
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