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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4672) RPC on Datanode blocked forever.
Date Mon, 17 Nov 2008 22:53:44 GMT
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

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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