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From lei liu <liulei...@gmail.com>
Subject ./bin/hdfs haadmin -transitionToActive deadlock
Date Sat, 12 Oct 2013 07:54:52 GMT
I use CDH4.3.1, When I start NameNode,and transition one NameNode to
active, there is below deadlock:

Found one Java-level deadlock:
=============================
"22558696@qtp-1616586953-6":
  waiting to lock monitor 0x00002aaab3621f40 (object 0x00000000f7646958, a
org.apache.hadoop.hdfs.server.namenode.NameNode),
  which is held by "IPC Server handler 1 on 20020"
"IPC Server handler 1 on 20020":
  waiting to lock monitor 0x00002aaab9052ab8 (object 0x00000000f747f1b8, a
org.apache.hadoop.metrics2.impl.MetricsSystemImpl),
  which is held by "Timer for 'NameNode' metrics system"
"Timer for 'NameNode' metrics system":
  waiting for ownable synchronizer 0x00000000f764a858, (a
java.util.concurrent.locks.ReentrantReadWriteLock$FairSync),
  which is held by "IPC Server handler 1 on 20020"

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