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https://issues.apache.org/jira/browse/HDFS-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215048#comment-13215048
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Suresh Srinivas commented on HDFS-3005:
---------------------------------------
I added that comment when doing Federation work. The problem was with the
existing code. I wanted to cleanup that part of the code and did not get to it.
Now that it is an issue, lets fix it :-)
> ConcurrentModificationException in FSDataset$FSVolume.getDfsUsed(..)
> --------------------------------------------------------------------
>
> Key: HDFS-3005
> URL: https://issues.apache.org/jira/browse/HDFS-3005
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Reporter: Tsz Wo (Nicholas), SZE
>
> Saw this in [build
> #1888|https://builds.apache.org/job/PreCommit-HDFS-Build/1888//testReport/org.apache.hadoop.hdfs.server.datanode/TestMulitipleNNDataBlockScanner/testBlockScannerAfterRestart/].
> {noformat}
> java.util.ConcurrentModificationException
> at java.util.HashMap$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$FSVolume.getDfsUsed(FSDataset.java:557)
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolumeSet.getDfsUsed(FSDataset.java:809)
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolumeSet.access$1400(FSDataset.java:774)
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset.getDfsUsed(FSDataset.java:1124)
> at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.sendHeartBeat(BPOfferService.java:406)
> at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.offerService(BPOfferService.java:490)
> at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.run(BPOfferService.java:635)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
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