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https://issues.apache.org/jira/browse/HDFS-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008220#comment-13008220
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Todd Lipcon commented on HDFS-1766:
-----------------------------------
Yep, the catch (Exception e)
> 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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