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[MAPREDUCE-4815] Speed up FileOutputCommitter#commitJob for 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, 2015-03-16, 22:52
[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-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-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-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-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