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From "Vinay (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5368) Namenode deadlock during safemode extention
Date Wed, 16 Oct 2013 09:39:41 GMT
Vinay created HDFS-5368:
---------------------------

             Summary: Namenode deadlock during safemode extention
                 Key: HDFS-5368
                 URL: https://issues.apache.org/jira/browse/HDFS-5368
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Vinay
            Assignee: Vinay
            Priority: Blocker


Namenode entered to safemode during restart

1. After restart NN entered to safemode extention.
2. During this time deadlock happened between datanode heartbeat and SafemodeMonitor() thread.

{normat}Found one Java-level deadlock:
=============================
"org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953":
  waiting to lock monitor 0x18c3b42c (object 0x0439c6f8, a java.util.TreeMap),
  which is held by "IPC Server handler 2 on 62212"
"IPC Server handler 2 on 62212":
  waiting to lock monitor 0x18c3987c (object 0x043849a0, a org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeInfo),
  which is held by "org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953"{noformat}

Check attached jstack for complete stack



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