ConcurrentModificationException in FSDataset$FSVolume.getDfsUsed(..)
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Key: HDFS-3005
URL: https://issues.apache.org/jira/browse/HDFS-3005
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
Saw this in [build
#1888|https://builds.apache.org/job/PreCommit-HDFS-Build/1888//testReport/org.apache.hadoop.hdfs.server.datanode/TestMulitipleNNDataBlockScanner/testBlockScannerAfterRestart/].
{noformat}
java.util.ConcurrentModificationException
at java.util.HashMap$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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