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https://issues.apache.org/jira/browse/HDFS-6428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003957#comment-14003957
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Daryn Sharp commented on HDFS-6428:
-----------------------------------
I only have JDK 7 handy and the debugger shows it's using concurrent classes
for the set and iterator. Maybe JDK6 is flawed. It's probably better to iterate
the values since the keys aren't used, and perhaps that will correctly use a
concurrent iterator.
> TestWebHdfsWithMultipleNameNodes failed with ConcurrentModificationException
> ----------------------------------------------------------------------------
>
> Key: HDFS-6428
> URL: https://issues.apache.org/jira/browse/HDFS-6428
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Attachments: HDFS-6428.001.patch
>
>
> TestWebHdfsWithMultipleNameNodes failed as follows:
> {code}
> Running org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes
> Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 8.643 sec <<<
> FAILURE! - in org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes
> org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes Time elapsed:
> 3.771 sec <<< ERROR!
> 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:1389)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode.shutdown(DataNode.java:1304)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdownDataNodes(MiniDFSCluster.java:1555)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1530)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1514)
> at
> org.apache.hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes.shutdownCluster(TestWebHdfsWithMultipleNameNodes.java:99)
> {code}
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