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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3616) ConcurrentModificationException in DN shutdown.
Date Sun, 08 Jul 2012 18:15:33 GMT
Uma Maheswara Rao G created HDFS-3616:
-----------------------------------------

             Summary: ConcurrentModificationException in DN shutdown.
                 Key: HDFS-3616
                 URL: https://issues.apache.org/jira/browse/HDFS-3616
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Uma Maheswara Rao G


I have seen this in precommit build #2743

{noformat}
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$EntryIterator.next(HashMap.java:834)
	at java.util.HashMap$EntryIterator.next(HashMap.java:832)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.shutdown(FsVolumeImpl.java:209)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeList.shutdown(FsVolumeList.java:168)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.shutdown(FsDatasetImpl.java:1214)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdown(DataNode.java:1105)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdownDataNodes(MiniDFSCluster.java:1324)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1304)
	at org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes.shutdownCluster(TestWebHdfsWithMultipleNameNodes.java:100)
{noformat}



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