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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1766) Datanode is marked dead, but datanode process is alive and verifying blocks
Date Mon, 21 Mar 2011 05:19:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009023#comment-13009023
] 

dhruba borthakur commented on HDFS-1766:
----------------------------------------

Yes, catching Throwable might be better.

> 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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