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[MAPREDUCE-2354] Shuffle should be optimized - MapReduce - [issue]
...Our study shows that shuffle is a performance bottleneck of mapreduce computing. There are some problems of shuffle:(1)Shuffle and reduce are tightly-coupled, usually shuffle phase doesn't c...
http://issues.apache.org/jira/browse/MAPREDUCE-2354    Author: MengWang, 2013-02-08, 06:18
[MAPREDUCE-3927] Shuffle hang when set map.failures.percent - MapReduce - [issue]
...When set mapred.max.map.failures.percent and there does have some failed maps, then shuffle will hang...
http://issues.apache.org/jira/browse/MAPREDUCE-3927    Author: MengWang, 2012-09-07, 22:10
[MAPREDUCE-2345] Optimize jobtracker's  memory usage   - MapReduce - [issue]
...Too many tasks will eat up a considerable amount of JobTracker's heap space. According to our observation, 50GB heap size can support to 5,000,000 tasks, so we should optimize jobtracker's m...
http://issues.apache.org/jira/browse/MAPREDUCE-2345    Author: MengWang, 2011-10-31, 04:58
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