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https://issues.apache.org/jira/browse/MAPREDUCE-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975418#action_12975418
 ] 

Todd Lipcon commented on MAPREDUCE-2224:
----------------------------------------

     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or 
modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning 
messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number 
of javac compiler warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs 
(version 1.3.9) warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the 
total number of release audit warnings.
     [exec] 
     [exec]     +1 system test framework.  The patch passed system test 
framework compile.


Failed tests:
    [junit] Test org.apache.hadoop.mapred.TestControlledMapReduceJob FAILED 
(timeout)
    [junit] Test org.apache.hadoop.mapreduce.lib.db.TestDBJob FAILED (timeout)
    [junit] Test org.apache.hadoop.mapreduce.lib.db.TestDataDrivenDBInputFormat 
FAILED (timeout)

which I believe are all failing on trunk


> Synchronization bugs in JvmManager
> ----------------------------------
>
>                 Key: MAPREDUCE-2224
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2224
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.22.0
>
>         Attachments: mapreduce-2224-cdh3.txt, mapreduce-2224.txt, 
> mapreduce-2224.txt, mapreduce-2224.txt, mapreduce-2224.txt
>
>
> JvmManager.JvmManagerForType has several HashMap members that are 
> inconsistently synchronized. I've seen sporadic NPEs in the 0.20 version of 
> this code which has similar bugs.

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