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[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, 2015-03-03, 03:20
[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, 2015-02-27, 17:23
[MAPREDUCE-6261] NullPointerException if MapOutputBuffer.flush invoked twice - MapReduce - [issue]
...MapOutputBuffer.flush will throw an NPE if it is invoked twice, since it blindly assumes kvbuffer is not null yet sets kvbuffer to null towards the end of the method....
http://issues.apache.org/jira/browse/MAPREDUCE-6261    Author: Jason Lowe, 2015-02-19, 15:21
[MAPREDUCE-6263] Large jobs can lose history when killed due to brief client timeout - MapReduce - [issue]
...YARNRunner connects to the AM to send the kill job command then waits a hardcoded 10 seconds for the job to enter a terminal state.  If the job fails to enter a terminal state in that t...
http://issues.apache.org/jira/browse/MAPREDUCE-6263    Author: Jason Lowe, 2015-02-19, 01:23
[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, 2015-02-17, 15:31
[MAPREDUCE-5727] History server web page can filter without showing filter keyword - MapReduce - [issue]
...I loaded up a job conf page on the history server and used one of the search boxes to narrow the results.  I then navigated to other pages (e.g.: map tasks, logs, etc.) then navigated b...
http://issues.apache.org/jira/browse/MAPREDUCE-5727    Author: Jason Lowe, 2015-02-11, 17:10
[MAPREDUCE-5267] History server should be more robust when cleaning old jobs - MapReduce - [issue]
...Ran across a situation where an admin user had accidentally created a directory in one of the date directories under /mapred/history/done/ that was not readable by the historyserver user. &n...
http://issues.apache.org/jira/browse/MAPREDUCE-5267    Author: Jason Lowe, 2015-02-11, 16:12
[MAPREDUCE-5044] Have AM trigger jstack on task attempts that timeout before killing them - MapReduce - [issue]
...When an AM expires a task attempt it would be nice if it triggered a jstack output via SIGQUIT before killing the task attempt.  This would be invaluable for helping users debug their h...
http://issues.apache.org/jira/browse/MAPREDUCE-5044    Author: Jason Lowe, 2015-02-05, 19:22
[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-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
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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