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https://issues.apache.org/jira/browse/HADOOP-3639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608021#action_12608021
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Amar Kamat commented on HADOOP-3639:
------------------------------------
The exception is
{code}
Exception in thread "Thread-5" java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$KeyIterator.next(TreeMap.java:1152)
at org.apache.hadoop.dfs.DFSClient.close(DFSClient.java:212)
at
org.apache.hadoop.dfs.DistributedFileSystem.close(DistributedFileSystem.java:228)
at org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:1379)
at org.apache.hadoop.fs.FileSystem.closeAll(FileSystem.java:230)
at
org.apache.hadoop.fs.FileSystem$ClientFinalizer.run(FileSystem.java:215)
{code}
> Exception when closing DFSClient while multiple files are open
> --------------------------------------------------------------
>
> Key: HADOOP-3639
> URL: https://issues.apache.org/jira/browse/HADOOP-3639
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.0, 0.18.0
> Reporter: Benjamin Gufler
> Attachments: patch-dfs-close
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> DFSClient.close uses an iterator for closing files which are still open.
> Closing a file removes that file from the list of open files, which in turn
> breaks the iterator.
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