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[MAPREDUCE-4815] FileOutputCommitter.commitJob can be very slow for jobs with many output files - MapReduce - [issue]
...If a job generates many files to commit then the commitJob method call at the end of the job can take minutes.  This is a performance regression from 1.x, as 1.x had the tasks commit di...
http://issues.apache.org/jira/browse/MAPREDUCE-4815    Author: Jason Lowe, 2015-01-31, 00:22
[MAPREDUCE-6230] MR AM does not survive RM restart if RM activated a new AMRM secret key - MapReduce - [issue]
...A MapReduce AM will fail to reconnect to an RM that performed restart in the following scenario: MapReduce job launched with AMRM token generated from AMRM secret X RM rolls new AMRM secret ...
http://issues.apache.org/jira/browse/MAPREDUCE-6230    Author: Jason Lowe, 2015-01-29, 15:25
[MAPREDUCE-6225] Fix new findbug warnings in hadoop-mapreduce-client-core - MapReduce - [issue]
...Recent precommit builds in hadoop-mapreduce-client-core are flagging findbug warnings that appear to be new with the recent findbugs upgrade.  These need to be cleaned up....
http://issues.apache.org/jira/browse/MAPREDUCE-6225    Author: Jason Lowe, 2015-01-28, 20:54
[MAPREDUCE-6141] History server leveldb recovery store - MapReduce - [issue]
...It would be nice to have a leveldb option to the job history server recovery store.  Leveldb would provide some benefits over the existing filesystem store such as better support for at...
http://issues.apache.org/jira/browse/MAPREDUCE-6141    Author: Jason Lowe, 2015-01-27, 15:05
[MAPREDUCE-6219] Reduce memory required for FileInputFormat located status optimization - MapReduce - [issue]
...MAPREDUCE-1981 introduced an optimization to drastically reduce the number of namenode operations required to compute input splits when processing a directory.  However it requires more...
http://issues.apache.org/jira/browse/MAPREDUCE-6219    Author: Jason Lowe, 2015-01-20, 21:36
[MAPREDUCE-5583] Ability to limit running map and reduce tasks - MapReduce - [issue]
...It would be nice if users could specify a limit to the number of map or reduce tasks that are running simultaneously.  Occasionally users are performing operations in tasks that can lea...
http://issues.apache.org/jira/browse/MAPREDUCE-5583    Author: Jason Lowe, 2014-12-08, 02:52
[MAPREDUCE-6172] TestDbClasses timeouts are too aggressive - MapReduce - [issue]
...Some of the TestDbClasses test timeouts are only 1 second, and some of those tests perform disk I/O which could easily exceed the test timeout if the disk is busy or there's some other hiccu...
http://issues.apache.org/jira/browse/MAPREDUCE-6172    Author: Jason Lowe, 2014-12-02, 15:27
[MAPREDUCE-5885] build/test/test.mapred.spill causes release audit warnings - MapReduce - [issue]
...Multiple unit tests are creating files under hadoop-mapreduce-client-jobclient/build/test/test.mapred.spill which are causing release audit warnings during Jenkins patch precommit builds. &n...
http://issues.apache.org/jira/browse/MAPREDUCE-5885    Author: Jason Lowe, 2014-12-01, 03:11
[MAPREDUCE-5891] Improved shuffle error handling across NM restarts - MapReduce - [issue]
...To minimize the number of map fetch failures reported by reducers across an NM restart it would be nice if reducers only reported a fetch failure after trying for at specified period of time...
http://issues.apache.org/jira/browse/MAPREDUCE-5891    Author: Jason Lowe, 2014-12-01, 03:11
[MAPREDUCE-6161] mapred hsadmin command missing from trunk - MapReduce - [issue]
...The hsadmin subcommand of the mapred script is no longer present in trunk. It is present in branch-2....
http://issues.apache.org/jira/browse/MAPREDUCE-6161    Author: Jason Lowe, 2014-11-20, 17:55
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB