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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12984) BlockPoolSlice can leak in a mini dfs cluster
Date Fri, 12 Jan 2018 15:08:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324092#comment-16324092
] 

Robert Joseph Evans commented on HDFS-12984:
--------------------------------------------

+1 for committing it.

> 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
>         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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