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Would multireducers be of interest to Hadoop MR core? - MapReduce - [mail # dev]
...Hi,Hadoop includes MultipleOutputs class to deal with MR job that needs towrite to multiple output formats.We at Akamai have extended the idea, and allowed multiple mappers to writeto multip...
   Author: Elazar Leibovich, 2014-09-04, 22:42
[MAPREDUCE-5279] Jobs can deadlock if headroom is limited by cpu instead of memory - MapReduce - [issue]
...YARN-2 imported cpu dimension scheduling, but MR RMContainerAllocator doesn't take into account virtual cores while scheduling reduce tasks.This may cause more reduce tasks to be scheduled b...
http://issues.apache.org/jira/browse/MAPREDUCE-5279    Author: Peng Zhang, 2014-09-04, 16:52
[MAPREDUCE-5221] Reduce side Combiner is not used when using the new API - MapReduce - [issue]
...If a combiner is specified using o.a.h.mapreduce.Job.setCombinerClass - this will silently ignored on the reduce side since the reduce side usage is only aware of the old api combiner.This d...
http://issues.apache.org/jira/browse/MAPREDUCE-5221    Author: Siddharth Seth, 2014-09-04, 04:14
[MAPREDUCE-6057] Remove obsolete entries from mapred-default.xml - MapReduce - [issue]
...The following properties are defined in mapred-default.xml but no longer exist in MRJobConfig.  map.sort.class  mapred.child.env  mapred.child.java.opts &n...
http://issues.apache.org/jira/browse/MAPREDUCE-6057    Author: Ray Chiang, 2014-09-04, 03:56
[MAPREDUCE-5891] Improved shuffle error handling across NM restarts - MapReduce - [issue]
...To minimize the number of map fetch failures reported by reducers across an NM restart it would be nice if reducers only reported a fetch failure after trying for at specified period of time...
http://issues.apache.org/jira/browse/MAPREDUCE-5891    Author: Jason Lowe, 2014-09-04, 03:40
[MAPREDUCE-5688] TestStagingCleanup fails intermittently with JDK7 - MapReduce - [issue]
...Due to random ordering ordering in JDK7, the test TestStagingCleanup#testDeletionofStagingOnKillLastTry is failingTests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4.231 sec &l...
http://issues.apache.org/jira/browse/MAPREDUCE-5688    Author: Mit Desai, 2014-09-04, 02:15
[MAPREDUCE-5791] Shuffle phase is slow in Windows - FadviseFileRegion::transferTo does not read disks efficiently - MapReduce - [issue]
...transferTo method in org.apache.hadoop.mapred.FadvisedFileRegion is using transferTo method from a FileChannel to transfer data from a disk to socket. This is performing slow in Windows, slo...
http://issues.apache.org/jira/browse/MAPREDUCE-5791    Author: Nikola Vujic, 2014-09-04, 02:15
[MAPREDUCE-5794] SliveMapper always uses default FileSystem. - MapReduce - [issue]
...Similar to MAPREDUCE-5780, SliveMapper should use the test path to get FileSystem....
http://issues.apache.org/jira/browse/MAPREDUCE-5794    Author: Tsz Wo Nicholas Sze, 2014-09-04, 02:15
[MAPREDUCE-5833] TestRMContainerAllocator fails ocassionally - MapReduce - [issue]
...testReportedAppProgress and testReportedAppProgressWithOnlyMaps have race conditions.Stacktracejava.util.NoSuchElementException: null at java.util.Collections$EmptyIterator.next(Collections....
http://issues.apache.org/jira/browse/MAPREDUCE-5833    Author: Zhijie Shen, 2014-09-04, 02:12
[MAPREDUCE-5835] Killing Task might cause the job to go to ERROR state - MapReduce - [issue]
...There could be a race condition if job is killed right after task attempt receives TA_DONE event. In that case, TaskImpl might receive T_ATTEMPT_SUCCEEDED followed by T_ATTEMPTED_KILLED for ...
http://issues.apache.org/jira/browse/MAPREDUCE-5835    Author: Ming Ma, 2014-09-04, 02:12
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