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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3936) MiniDFSCluster shutdown may fail due to BlocksMap#getBlockCollection NPE
Date Fri, 14 Sep 2012 05:36:07 GMT
Eli Collins created HDFS-3936:
---------------------------------

             Summary: MiniDFSCluster shutdown may fail due to BlocksMap#getBlockCollection
NPE
                 Key: HDFS-3936
                 URL: https://issues.apache.org/jira/browse/HDFS-3936
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha
            Reporter: Eli Collins
            Assignee: Eli Collins


Looks like HDFS-3664 didn't fix the whole issue because the added join times out because the
thread closing the BM (FSN#stopCommonServices) holds the FSN lock while closing the BM and
the BM is block uninterruptedly trying to aquire the FSN lock.

{noformat}
2012-09-13 18:54:12,526 FATAL hdfs.MiniDFSCluster (MiniDFSCluster.java:shutdown(1355)) - Test
resulted in an unexpected exit
org.apache.hadoop.util.ExitUtil$ExitException: Fatal exception with message null
stack trace
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:101)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1132)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1107)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3061)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3023)
	at java.lang.Thread.run(Thread.java:662)
{noformat}

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