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https://issues.apache.org/jira/browse/HDFS-14986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340749#comment-17340749
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lei w commented on HDFS-14986:
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hi [~Aiphag0] ， hadoop 3.1.2 also appear deadlock as you said above
[comment-16973314](https://issues.apache.org/jira/browse/HDFS-14986?focusedCommentId=16973314&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16973314)
> ReplicaCachingGetSpaceUsed throws ConcurrentModificationException
> ------------------------------------------------------------------
>
> Key: HDFS-14986
> URL: https://issues.apache.org/jira/browse/HDFS-14986
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, performance
> Affects Versions: 2.10.0
> Reporter: Ryan Wu
> Assignee: Aiphago
> Priority: Major
> Fix For: 3.3.0, 3.1.4, 2.10.1
>
> Attachments: HDFS-14986.001.patch, HDFS-14986.002.patch,
> HDFS-14986.003.patch, HDFS-14986.004.patch, HDFS-14986.005.patch,
> HDFS-14986.006.patch
>
>
> Running DU across lots of disks is very expensive . We applied the patch
> HDFS-14313 to get used space from ReplicaInfo in memory.However, new du
> threads throw the exception
> {code:java}
> // 2019-11-08 18:07:13,858 ERROR
> [refreshUsed-/home/vipshop/hard_disk/7/dfs/dn/current/BP-1203969992-XXXX-1450855658517]
>
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed:
> ReplicaCachingGetSpaceUsed refresh error
> java.util.ConcurrentModificationException: Tree has been modified outside of
> iterator
> at
> org.apache.hadoop.hdfs.util.FoldedTreeSet$TreeSetIterator.checkForModification(FoldedTreeSet.java:311)
>
> at
> org.apache.hadoop.hdfs.util.FoldedTreeSet$TreeSetIterator.hasNext(FoldedTreeSet.java:256)
>
> at java.util.AbstractCollection.addAll(AbstractCollection.java:343)
> at java.util.HashSet.<init>(HashSet.java:120)
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.deepCopyReplica(FsDatasetImpl.java:1052)
>
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed.refresh(ReplicaCachingGetSpaceUsed.java:73)
>
> at
> org.apache.hadoop.fs.CachingGetSpaceUsed$RefreshThread.run(CachingGetSpaceUsed.java:178)
>
> at java.lang.Thread.run(Thread.java:748)
> {code}
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