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Vinod Kumar Vavilapalli
Arun C Murthy
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[MAPREDUCE-5932] Provide an option to use a dedicated reduce-side shuffle log
...For reducers in large jobs our users cannot easily spot portions of the log associated with problems with their code. An example reducer with INFO-level logging generates ~3500 lines / ~700K...
, 2015-04-25, 00:15
[MAPREDUCE-5892] Derive MR-AM container size and Xmx based on the job size: number of splits and reduces
, 2015-04-20, 22:05
[MAPREDUCE-6128] Automatic addition of bundled jars to distributed cache
...On the client side, JDK adds Class-Path elements from the job jar manifeston the classpath. In theory there could be many bundled jars in many directories such that adding them manually via ...
, 2015-04-09, 23:29
[MAPREDUCE-4844] Counters / AbstractCounters have constant references not declared final
...Counters have a number of immutable fields that have not been declared 'final'.For example, the field groups is not final. It is, however, accessed in a couple of methods that are declared '...
, 2015-04-04, 19:32
[MAPREDUCE-6280] Reject directory vs file path conflict resolution in FileOutputCommitter
...If one task commits a directory foo, and then another task commits file foo, the directory foo with potentially many files will be wiped out. While this is a very unlikely scenario, due to t...
, 2015-03-18, 22:08
[MAPREDUCE-5847] Remove redundant code for fileOutputByteCounter in MapTask and ReduceTask
...Both MapTask and ReduceTask carry redundant code to update BYTES_WRITTEN counter. However, Task.updateCounters uses file system stats for this....
, 2015-02-05, 22:49
[MAPREDUCE-5839] Provide a boolean switch to enable LazyOutputFormat
, 2015-02-05, 18:46
[MAPREDUCE-5696] Add Localization counters to MR
...Users are often unaware of localization cost that their jobs incur. To measure effectiveness of localization caches it is necessary to expose the overhead in the form of user-visible metrics...
, 2015-02-05, 18:31
[MAPREDUCE-5648] Allow user-specified diagnostics for killed tasks and jobs
...Our users and tools want to be able to supply additional custom diagnostic messages to mapreduce ClientProtocol killTask....
, 2015-02-05, 18:31
[MAPREDUCE-6209] Implement a heuristic to auto-size Java heap of MRAppMaster container proportional to the job size
...The size of Java heap required by the AM is linearly proportional to the size of the MR job (number of mappers/splits and reducers). it would be nice if users did not have to adjust the AM c...
, 2015-01-21, 11:14
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