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https://issues.apache.org/jira/browse/HDFS-12984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324245#comment-16324245
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Ajay Kumar commented on HDFS-12984:
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[~revans2] thanks for reporting and review. [~arpitagarwal] thanks for review
and commit.
> BlockPoolSlice can leak in a mini dfs cluster
> ---------------------------------------------
>
> Key: HDFS-12984
> URL: https://issues.apache.org/jira/browse/HDFS-12984
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.5
> Reporter: Robert Joseph Evans
> Assignee: Ajay Kumar
> Fix For: 3.1.0
>
> Attachments: HDFS-12984.001.patch, Screen Shot 2018-01-05 at 4.38.06
> PM.png, Screen Shot 2018-01-05 at 5.26.54 PM.png, Screen Shot 2018-01-05 at
> 5.31.52 PM.png
>
>
> When running some unit tests for storm we found that we would occasionally
> get out of memory errors on the HDFS integration tests.
> When I got a heap dump I found that the ShutdownHookManager was full of
> BlockPoolSlice$1 instances. Which hold a reference to the BlockPoolSlice
> which then in turn holds a reference to the DataNode etc....
> It looks like when shutdown is called on the BlockPoolSlice there is no way
> to remove the shut down hook in because no reference to it is saved.
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