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https://issues.apache.org/jira/browse/HDFS-5249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13775860#comment-13775860
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Jing Zhao commented on HDFS-5249:
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+1 for the patch.
> Fix dumper thread which may die silently
> ----------------------------------------
>
> Key: HDFS-5249
> URL: https://issues.apache.org/jira/browse/HDFS-5249
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: nfs
> Reporter: Brandon Li
> Assignee: Brandon Li
> Attachments: HDFS-5249.02.patch, HDFS-5249.patch
>
>
> Dumper thread can get an NPE when the WriteCtx it's about to work on is just
> deleted by write back thread.
> A dead dumper thread could cause out-of-memory error when too many pending
> writes accumulated for one opened file.
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