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[MAPREDUCE-4883] Reducer's Maximum Shuffle Buffer Size should be enlarged for 64bit JVM - MapReduce - [issue]
...In hadoop-0.20.2, hadoop-1.0.3 or other versions, reducer's shuffle buffer size cannot exceed 2048MB (i.e., Integer.MAX_VALUE). This is reasonable for 32bit JVM.But for 64bit JVM, although r...
http://issues.apache.org/jira/browse/MAPREDUCE-4883    Author: Lijie Xu, 2014-01-28, 05:21
[MAPREDUCE-5482] Release kvoffsets and kvindices before going to merge phase - MapReduce - [issue]
...In org.apache.hadoop.mapred.MapTask.MapOutputBuffer.flush() method, we only released the kvbuffer before the merge phase (i.e., mergeParts()). Though kvindices and kvoffsets are small in man...
http://issues.apache.org/jira/browse/MAPREDUCE-5482    Author: Lijie Xu, 2013-08-27, 03:38
[MAPREDUCE-5461] Let users be able to get latest Key in reduce() - MapReduce - [issue]
...Reducer generates <K, List(V)> for reduce(). In some cases such as SecondarySort, although current V and next V share the same K, their actual corresponding Ks are different. For examp...
http://issues.apache.org/jira/browse/MAPREDUCE-5461    Author: Lijie Xu, 2013-08-15, 16:36
[MAPREDUCE-4882] Error in estimating the length of the output file in Spill Phase - MapReduce - [issue]
...The sortAndSpill() method in MapTask.java has an error in estimating the length of the output file. The "long size" should be "(bufvoid - bufstart) + bufend" not "(bufvoid - bufend) + bufsta...
http://issues.apache.org/jira/browse/MAPREDUCE-4882    Author: Lijie Xu, 2013-01-26, 12:37
About reducer's Shuffle JVM Heap Size - MapReduce - [mail # dev]
...Hi, all. I'm debugging Hadoop's source code and find an incomprehensible setting. In hadoop-0.20.2 and hadoop-1.0.3, reducer's shuffle buffer size cannot  exceed 2048MB (i.e., Integer.M...
   Author: Lijie Xu, 2012-10-27, 14:35
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