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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6098) ConcurrentModificationException exception during DataNode shutdown
Date Wed, 12 Mar 2014 21:50:43 GMT
Arpit Agarwal created HDFS-6098:
-----------------------------------

             Summary: ConcurrentModificationException exception during DataNode shutdown
                 Key: HDFS-6098
                 URL: https://issues.apache.org/jira/browse/HDFS-6098
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 2.4.0
            Reporter: Arpit Agarwal


Exception hit during DN shutdown while running {{TestWebHdfsWithMultipleNameNodes}}:

{code}
java.util.ConcurrentModificationException: null
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
	at java.util.HashMap$EntryIterator.next(HashMap.java:934)
	at java.util.HashMap$EntryIterator.next(HashMap.java:932)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.shutdown(FsVolumeImpl.java:251)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeList.shutdown(FsVolumeList.java:249)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.shutdown(FsDatasetImpl.java:1376)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdown(DataNode.java:1301)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdownDataNodes(MiniDFSCluster.java:1523)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1498)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1482)
	at org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes.shutdownCluster(TestWebHdfsWithMultipleNameNodes.java:99)
{code}



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