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  1. Hadoop HDFS
  2. HDFS-27

RPC on Datanode blocked forever.

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Not A Problem
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None
    • Environment:

      Java SE 1.6.0-b105 on Linux 2.6.x

      Description

      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.

        Attachments

        1. datanode-jstack
          47 kB
          Raghu Angadi

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            • Assignee:
              Unassigned
              Reporter:
              rangadi Raghu Angadi
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              Dates

              • Created:
                Updated:
                Resolved: