[HDFS-6098] ConcurrentModificationException exception during DataNode shutdown

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.4.0
• Component/s: datanode
• Assignee: Unassigned
• Reporter: Arpit Agarwal
• Created: 12/Mar/14 21:49
• Updated: 12/Mar/14 23:06
• Resolved: 12/Mar/14 23:06

Description

Exception hit during DN shutdown while running TestWebHdfsWithMultipleNameNodes:

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)

Issue Links

• is duplicated by: HDFS-5705 TestSecondaryNameNodeUpgrade#testChangeNsIDFails may fail due to ConcurrentModificationException