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[MAPREDUCE-4582] [MAPREDUCE-3902] ScheduledRequests#remove should remove the elements from mapsHostMapping and mapsRackMapping - MapReduce - [issue]
...ScheduledRequests#remove only remove the specified TaskAttemptId from "maps".It's inefficient, and the method should remove the elements from mapsHostMapping and mapsRackMapping....
http://issues.apache.org/jira/browse/MAPREDUCE-4582    Author: Tsuyoshi OZAWA, 2012-09-04, 19:17
[MAPREDUCE-4615] [MAPREDUCE-3902] RMContainerAllocator#assign should be split into functions - MapReduce - [issue]
...Currently, the RMContainerAllocator#assign functions does a lot of works inside the one function. This is a bit confusing and make the changes difficult, so this ticket is for refactoring th...
http://issues.apache.org/jira/browse/MAPREDUCE-4615    Author: Tsuyoshi OZAWA, 2012-08-31, 23:02
[MAPREDUCE-4609] [MAPREDUCE-3902] RMContainerAllocator#scheduleInterval should be configurable - MapReduce - [issue]
...Currently, RMContainerAllocator#scheduleInterval is fixed. It should be configurable....
http://issues.apache.org/jira/browse/MAPREDUCE-4609    Author: Tsuyoshi OZAWA, 2012-08-31, 21:20
[MAPREDUCE-4599] [MAPREDUCE-3902] Ensure not to launch container on blacklisted hosts - MapReduce - [issue]
...The current implementation of RMContainerAllocator doesn't ensure not to launch containers on blacklisted nodes. This may cause some skews by tasks on bad nodes....
http://issues.apache.org/jira/browse/MAPREDUCE-4599    Author: Tsuyoshi OZAWA, 2012-08-29, 19:32
Re: How to reduce total shuffle time - MapReduce - [mail # user]
...It depends of workload. Could you tell us more specification about your job? In general case which reducers are bottleneck, there are some tuning techniques as follows: 1. Allocate more memo...
   Author: Tsuyoshi OZAWA, 2012-08-28, 08:37
[MAPREDUCE-4581] [MAPREDUCE-3902] TaskHeartbeatHandler should extends HeartbeatHandlerBase - MapReduce - [issue]
...TaskHeartbeatHandler extends AbstractService currently, however, this causes code duplication between TaskHeartbeatHandler and HeartbeatHandlerBase. TaskHeartbeatHandler should extends Heart...
http://issues.apache.org/jira/browse/MAPREDUCE-4581    Author: Tsuyoshi OZAWA, 2012-08-25, 21:27
Re: Branch created for MAPREDUCE-3902 - MapReduce - [mail # dev]
...Thanks for your quick response :)  Tsuyoshi  On Fri, Aug 24, 2012 at 2:08 PM, Siddharth Seth  wrote:...
   Author: Tsuyoshi OZAWA, 2012-08-24, 05:16
Re: Multi-level aggregation with combining the result of maps per node/rack - MapReduce - [mail # dev]
...Bikas,  Yes, this feature is similar to Dryad approach. The design of current prototype is a bit hacky to minimize the costs of implementation. The modified file is only MapTask.java. P...
   Author: Tsuyoshi OZAWA, 2012-08-01, 07:51
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