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Posted to hdfs-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2011/03/03 03:05:36 UTC

[jira] Resolved: (HDFS-27) RPC on Datanode blocked forever.

     [ https://issues.apache.org/jira/browse/HDFS-27?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HDFS-27.
----------------------------------------

    Resolution: Not A Problem

I think this is not a problem anymore.  Please feel free to reopen if I was wrong.

> RPC on Datanode blocked forever.
> --------------------------------
>
>                 Key: HDFS-27
>                 URL: https://issues.apache.org/jira/browse/HDFS-27
>             Project: Hadoop HDFS
>          Issue Type: Bug
>         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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