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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-7550) Synchronization problem in AssignmentManager
Date Mon, 14 Jan 2013 05:32:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl resolved HBASE-7550.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to 0.94. Thanks for the quick review.
                
> 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.&lt;init&gt;(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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