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https://issues.apache.org/jira/browse/HDFS-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins reopened HDFS-3048:
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> Small race in BlockManager#close
> --------------------------------
>
> Key: HDFS-3048
> URL: https://issues.apache.org/jira/browse/HDFS-3048
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.2
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hdfs-3048.txt
>
>
> There's a small race in BlockManager#close, we close the BlocksMap before the
> replication monitor, which means the replication monitor can NPE if it tries
> to access the blocks map. We need to swap the order (close the blocks map
> after shutting down the repl monitor).
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