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https://issues.apache.org/jira/browse/HDFS-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008213#comment-13008213
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Hairong Kuang commented on HDFS-1766:
-------------------------------------

Todd, you meant the part of code in createDataNode, right?

> Datanode is marked dead, but datanode process is alive and verifying blocks
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-1766
>                 URL: https://issues.apache.org/jira/browse/HDFS-1766
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.23.0
>
>         Attachments: killDN.patch
>
>
> We have a datanode marked dead in the namenode, and it is not taking any 
> traffic. But it is verifying blocks continuously, so the DataNode process is 
> definitely not dead. Jstack shows that the main thread and the offerService 
> thread are gone but the JVM stuck at waiting for other threads to die. It 
> seems to me that the offerService thread has died abnormally, for example, by 
> a runtime exception and it did not shut down other threads before exiting.

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