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[MAPREDUCE-5323] Min Spills For Combine Ignored - MapReduce - [issue]
...We've observed for some time that combiners always run when specified. However there is a config called mapreduce.map.combine.minspills which sort of implies that the developer or administra...
http://issues.apache.org/jira/browse/MAPREDUCE-5323    Author: Jeff Bean, 2013-06-15, 00:43
Re: Job Tracker & TaskTracker logs location Understaning - MapReduce - [mail # user]
...Give this a read, and let me know if there are still questions:  http://blog.cloudera.com/blog/2009/09/apache-hadoop-log-files-where-to-find-them-in-cdh-and-what-info-they-contain/ &nbs...
   Author: Jeff Bean, 2013-01-28, 18:10
Re: Fair Scheduler is not Fair why? - MapReduce - [mail # user]
...Validate your scheduler capacity and behavior by using sleep jobs. Submit sleep jobs to the pools that mirror your production jobs and just check that the scheduler pool allocation behaves a...
   Author: Jeff Bean, 2013-01-16, 17:02
[expand - 1 more] - Re: When reduce tasks start in MapReduce Streaming? - MapReduce - [mail # user]
...It's called Hadoop Streaming because keys and values are streamed in to stdin of the script you specify for Hadoop Streaming and then captured via stdout.  On Wed, Jan 16, 2013 at 1:04 ...
   Author: Jeff Bean, 2013-01-16, 09:20
Re: Profiler in Hadoop MapReduce - MapReduce - [mail # user]
...Hi Pedro,  Have you read the documentation on profiling MapReduce?  http://hadoop.apache.org/docs/r0.20.2/mapred_tutorial.html#Profiling  Jeff  On Sat, Dec 15, 2012 at 7:...
   Author: Jeff Bean, 2012-12-30, 18:23
[MAPREDUCE-2836] Provide option to fail jobs when submitted to non-existent pools. - MapReduce - [issue]
...In some environments, it might be desirable to explicitly specify the fair scheduler pools and to explicitly fail jobs that are not submitted to any of the pools. Current behavior of the fai...
http://issues.apache.org/jira/browse/MAPREDUCE-2836    Author: Jeff Bean, 2012-03-28, 09:12
[MAPREDUCE-2905] CapBasedLoadManager incorrectly allows assignment when assignMultiple is true (was: assignmultiple per job) - MapReduce - [issue]
...We encountered a situation where in the same cluster, large jobs benefit from mapred.fairscheduler.assignmultiple, but small jobs with small numbers of mappers do not: the mappers all clump ...
http://issues.apache.org/jira/browse/MAPREDUCE-2905    Author: Jeff Bean, 2011-11-22, 19:36
Re: mapred.child.java.opts question - MapReduce - [mail # user]
...Does your class use GenericOptionsParser (does it implement Tool, and does it call ToolRunner.run(), for example?  Jeff  On Tue, Jun 14, 2011 at 8:47 AM, Alex Kozlov  wrote: &...
   Author: Jeff Bean, 2011-06-14, 18:22
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