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  1. Hadoop HDFS
  2. HDFS-1782

FSNamesystem.startFileInternal(..) throws NullPointerException

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.22.0
    • Fix Version/s: 0.22.0, 0.23.0
    • Component/s: namenode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      I'm observing when there is one balancer running trying to run another one results in
      "Java.lang.NullPointerException" error. I was hoping to see message "Another balancer is running.
      Exiting.... Exiting ...". This is a reproducible issue.

      Details
      ========

      1) Cluster ->elrond

      [hdfs@]$ hadoop version

      2) Run first balancer
      [hdfs]$ hdfs balancer
      1
      through XX.XX.XX.XX:1004 is succeeded.
      [hdfs@]$ hdfs balancer
      11/03/09 16:34:32 INFO balancer.Balancer: namenodes =
      java.io.IOException: java.lang.NullPointerException
      at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1400)
      at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1284)
      at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:779)
      at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.apache.hadoop.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:346)
      at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1399)
      at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1395)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAs(Subject.java:396)
      at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1094)
      at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1393)
      . Exiting ...
      Balancing took 1.366 seconds

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            • Assignee:
              johnvijoe John George
              Reporter:
              johnvijoe John George
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              Dates

              • Created:
                Updated:
                Resolved: