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https://issues.apache.org/jira/browse/HDFS-27?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE resolved HDFS-27.
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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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