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https://issues.apache.org/jira/browse/HDFS-3664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439159#comment-13439159
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Andy Isaacson commented on HDFS-3664:
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bq. May be a dupe of HDFS-3048.
We've merged that patch and are still seeing this NPE (for example HDFS-3822),
so it's not a dupe.
> BlockManager race when stopping active services
> -----------------------------------------------
>
> Key: HDFS-3664
> URL: https://issues.apache.org/jira/browse/HDFS-3664
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Eli Collins
>
> Looks like there's a race hit by the test where we try to do block management
> while shutting down (eg allocate a block or compute replication work after
> BlocksMap#close, resulting in an NPE).
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