[jira] [Created] (HDFS-5705) TestSecondaryNameNodeUpgrade#testChangeNsIDFails may fail due to ConcurrentModificationException

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HDFS-5705:
----------------------------

             Summary: TestSecondaryNameNodeUpgrade#testChangeNsIDFails may fail due to ConcurrentModificationException
                 Key: HDFS-5705
                 URL: https://issues.apache.org/jira/browse/HDFS-5705
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Ted Yu


>From https://builds.apache.org/job/Hadoop-Hdfs-trunk/1626/testReport/org.apache.hadoop.hdfs.server.namenode/TestSecondaryNameNodeUpgrade/testChangeNsIDFails/ :
{code}
java.util.ConcurrentModificationException: null
	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:251)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeList.shutdown(FsVolumeList.java:218)
	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.shutdown(FsDatasetImpl.java:1414)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.shutdown(DataNode.java:1309)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdownDataNodes(MiniDFSCluster.java:1464)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1439)
	at org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1423)
	at org.apache.hadoop.hdfs.server.namenode.TestSecondaryNameNodeUpgrade.doIt(TestSecondaryNameNodeUpgrade.java:97)
	at org.apache.hadoop.hdfs.server.namenode.TestSecondaryNameNodeUpgrade.testChangeNsIDFails(TestSecondaryNameNodeUpgrade.java:116)
{code}
The above happens when shutdown() is called in parallel to addBlockPool() or shutdownBlockPool().



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