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[MAPREDUCE-4595] TestLostTracker failing - possibly due to a race in JobHistory.JobHistoryFilesManager#run() - MapReduce - [issue]
...The source for occasional failure of TestLostTracker seems like the following:On job completion, JobHistoryFilesManager#run() spawns another thread to move history files to done folder. Test...
http://issues.apache.org/jira/browse/MAPREDUCE-4595    Author: Karthik Kambatla, 2013-05-15, 06:16
[MAPREDUCE-4706] FairScheduler#dump(): Computing of # running maps and reduces is commented out - MapReduce - [issue]
...In FairScheduler#dump(), we conveniently comment the updating of number of running maps and reduces. It needs to be fixed for the dump to throw out meaningful information....
http://issues.apache.org/jira/browse/MAPREDUCE-4706    Author: Karthik Kambatla, 2013-05-15, 06:16
[MAPREDUCE-5222] Fix JobClient incompatibilities with MR1 - MapReduce - [issue]
...JobClient is missing the following two public methods we need to add for binary compatibility: static isJobDirValid(Path, FileSystem) Path getStagingAreaDir()...
http://issues.apache.org/jira/browse/MAPREDUCE-5222    Author: Karthik Kambatla, 2013-05-14, 15:06
[MAPREDUCE-5214] Compatibility: Add a deprecated MRAdmin that wraps around RMAdmin - MapReduce - [issue]
...MRAdmin doesn't apply to MR2. However, to maintain compatibility against 1.x releases, it might be a good idea to add a deprecated version of MRAdmin that wraps around RMAdmin, prints out a ...
http://issues.apache.org/jira/browse/MAPREDUCE-5214    Author: Karthik Kambatla, 2013-05-13, 23:42
[MAPREDUCE-5218] Annotate (comment) internal classes as Private - MapReduce - [issue]
...The following classes are intended for internal use and it would be nice to explicitly state that in comments/annotation. TaskUmbilicalProtocol TaskInProgress MapReducePolicyProvider MRAdmin...
http://issues.apache.org/jira/browse/MAPREDUCE-5218    Author: Karthik Kambatla, 2013-05-09, 22:23
[expand - 1 more] - Re: JVM vs container memory configs - MapReduce - [mail # dev]
...Thanks a lot for your inputs, Bobby and Harsh.  Harsh - Agree that we should raise the heap sizes, particularly for your second reason. Once we arrive at  a good default value, I t...
   Author: Karthik Kambatla, 2013-05-06, 16:59
[MAPREDUCE-5207] Add mapreduce.{map|reduce}.memory.mb defaults to mapred-default.xml - MapReduce - [issue]
...mapred-default.xml is missing defaults for mapredue.{map|reduce}.memory.mb...
http://issues.apache.org/jira/browse/MAPREDUCE-5207    Author: Karthik Kambatla, 2013-05-03, 18:01
Re: Cannot find JobTracker and TaskTracker classes in Hadoop 2.0.2-alpha - MapReduce - [mail # dev]
...Hi Thoihen  Hadoop 2.x (and 0.23.x) releases have MapReduce running on YARN, which operates on the ResourceManager/NodeManager architecture  and not JobTracker/TaskTracker. Hadoop ...
   Author: Karthik Kambatla, 2013-04-26, 18:28
Re: Why number of reducers should be less than number of reducer slots. - MapReduce - [mail # dev]
...I wonder how accurate that is.  However, by setting the number of reducers slightly lesser than the reduce slots, the difference acts as headroom for speculative reduce tasks. And, the ...
   Author: Karthik Kambatla, 2013-04-23, 06:33
[MAPREDUCE-5098] Fix findbugs warnings in gridmix - MapReduce - [issue]
...Work on MAPREDUCE-5077 has exposed a bunch of findbugs warnings in gridmix code. https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3459//artifact/trunk/patchprocess/newPatchFindbugsWar...
http://issues.apache.org/jira/browse/MAPREDUCE-5098    Author: Karthik Kambatla, 2013-04-11, 14:09
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