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https://issues.apache.org/jira/browse/HADOOP-4672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668254#action_12668254
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Raghu Angadi commented on HADOOP-4672:
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The above jstack is from Koji.
> RPC on Datanode blocked forever.
> --------------------------------
>
> Key: HADOOP-4672
> URL: https://issues.apache.org/jira/browse/HADOOP-4672
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs, io
> Affects Versions: 0.17.0
> Environment: Java SE 1.6.0-b105 on Linux 2.6.x
> Reporter: Raghu Angadi
> Attachments: datanode-jstack
>
>
> We recently noticed a number of datanodes got stuck. The main thread that
> sends heartbeats and block reports is blocked in select() in side
> blockReport() RPC. I will add a stack trace in the next comment.
> I am not sure why select was blocked forever since there is no connection
> open to NameNode. In fact, NN was restarted in between. It could be some JDK
> bug or a Hadoop bug.
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