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[MAPREDUCE-4272] SortedRanges.Range#compareTo is not spec compliant - MapReduce - [issue]
...SortedRanges.Range#compareTo does not satisfy the requirement of Comparable#compareTo, where "the implementor must ensure sgn(x.compareTo(y)) == -sgn(y.compareTo(x)) for all x and y."Th...
http://issues.apache.org/jira/browse/MAPREDUCE-4272    Author: Luke Lu, 2012-12-28, 00:13
[MAPREDUCE-4881] Task should throw exception and die if its attempt directory already exists - MapReduce - [issue]
...While tracking down HADOOP-9051, I noticed that TaskLog can create circular symlinks when a task's attempt directory exists before task initialization, which usually indicate a restart bug i...
http://issues.apache.org/jira/browse/MAPREDUCE-4881    Author: Luke Lu, 2012-12-15, 18:22
Re: Shuffle phase: fine-grained control of data flow - MapReduce - [mail # dev]
...For skewed map output, another optimization would be "local direct shuffle" to further minimize network usage AND disk spillage (on the reducer side), ie. schedule reduce tasks on the same h...
   Author: Luke Lu, 2012-11-09, 17:54
Re: About reducer's Shuffle JVM Heap Size - MapReduce - [mail # dev]
...The task code was optimized from 32-bit jvm (yes, people use 64-bit jvm for servers and 32-bit jvm for tasks in production), because it's more memory efficient with the same Xmx, which by de...
   Author: Luke Lu, 2012-11-02, 22:45
Re: Fair scheduler. - MapReduce - [mail # user]
...You have a different issue (in addition to MAPREDUCE-4398). setting mapreduce.jobtracker.staging.root.dir to /user will solve the first problem. The "magic" number of 4 is the default number...
   Author: Luke Lu, 2012-10-18, 10:11
Re: issue with permissions of mapred.system.dir - MapReduce - [mail # user]
...It's a known issue for fairscheduler in Hadoop 1.x, see MAPREDUCE-4398. A workaround is to submit 4 or more jobs as the user of the jobtracker and everything will work fine afterwards. BTW, ...
   Author: Luke Lu, 2012-10-14, 08:47
[MAPREDUCE-4399] Fix performance regression in shuffle - MapReduce - [issue]
...There is a significant (up to 3x) performance regression in shuffle (vs 0.20.2) in the Hadoop 1.x series. Most noticeable with high-end switches....
http://issues.apache.org/jira/browse/MAPREDUCE-4399    Author: Luke Lu, 2012-10-03, 05:10
[MAPREDUCE-3061] Generic application history service - MapReduce - [issue]
...The mapreduce job history server currently needs to be deployed as a trusted server in sync with the mapreduce runtime. Every new application would need a similar application history server....
http://issues.apache.org/jira/browse/MAPREDUCE-3061    Author: Luke Lu, 2012-08-28, 20:07
[MAPREDUCE-4400] Fix performance regression for small jobs/workflows - MapReduce - [issue]
...There is a significant performance regression for small jobs/workflows (vs 0.20.2) in the Hadoop 1.x series. Most noticeable with Hive and Pig jobs. PigMix has an average 40% regression agai...
http://issues.apache.org/jira/browse/MAPREDUCE-4400    Author: Luke Lu, 2012-08-24, 00:22
Re: MetricsContext counterpart in metrics2 framework - MapReduce - [mail # dev]
...There is no MetricsContext in metrics2. The functionality of MetricsContext is split into MetricsSource, MetricsSystem (the pubsub system) and MetricsSink. Typical monitoring plugins just im...
   Author: Luke Lu, 2012-07-25, 04:14
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