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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2013/01/14 06:04:12 UTC
[jira] [Commented] (HBASE-7550) Synchronization problem in
AssignmentManager
[ https://issues.apache.org/jira/browse/HBASE-7550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552433#comment-13552433 ]
Ted Yu commented on HBASE-7550:
-------------------------------
+1 on patch.
> Synchronization problem in AssignmentManager
> --------------------------------------------
>
> Key: HBASE-7550
> URL: https://issues.apache.org/jira/browse/HBASE-7550
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.5
>
> Attachments: 7550.txt
>
>
> While running TestSplitTransactionOnCluster#testShouldClearRITWhenNodeFoundInSplittingState in a loop I encountered this error condition:
> {code}
> java.util.NoSuchElementException
> at java.util.concurrent.ConcurrentSkipListMap$Iter.advance(ConcurrentSkipListMap.java:2224)
> at java.util.concurrent.ConcurrentSkipListMap$EntryIterator.next(ConcurrentSkipListMap.java:2270)
> at java.util.concurrent.ConcurrentSkipListMap$EntryIterator.next(ConcurrentSkipListMap.java:2266)
> at java.util.TreeMap.buildFromSorted(TreeMap.java:2394)
> at java.util.TreeMap.buildFromSorted(TreeMap.java:2344)
> at java.util.TreeMap.<init>(TreeMap.java:195)
> at org.apache.hadoop.hbase.master.AssignmentManager.getRegionsInTransition(AssignmentManager.java:2843)
> at org.apache.hadoop.hbase.regionserver.TestSplitTransactionOnCluster.testShouldClearRITWhenNodeFoundInSplittingState(TestSplitTransactionOnCluster.java:637)
> {code}
> This can only occur when the map being copied into the TreeMap is modified concurrently.
> While looking at the (0.94) code I noticed that synchronization is indeed missing from the nodeDeleted hook.
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