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[MAPREDUCE-6324] Uber jobs fail to update AMRM token when it rolls over - MapReduce - [issue]
...When the RM rolls a new AMRM master key the AMs are supposed to receive a new AMRM token on subsequent heartbeats between the time when the new key is rolled and when it is activated.  ...
http://issues.apache.org/jira/browse/MAPREDUCE-6324    Author: Jason Lowe, 2015-04-27, 23:07
[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, 2015-04-25, 00:15
[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, 2015-04-24, 01:24
[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, 2015-04-23, 05:37
[MAPREDUCE-6279] AM should explicity exit JVM after all services have stopped - MapReduce - [issue]
...Occasionally the MapReduce AM can "get stuck" trying to shut down.  MAPREDUCE-6049 and MAPREDUCE-5888 were specific instances that have been fixed, but this can also occur with uber job...
http://issues.apache.org/jira/browse/MAPREDUCE-6279    Author: Jason Lowe, 2015-04-22, 22:26
[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, 2015-04-10, 21:19
[MAPREDUCE-6263] Configurable timeout between YARNRunner terminate the application and forcefully kill. - 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, 2015-04-10, 21:19
[MAPREDUCE-6162] mapred hsadmin fails on a secure cluster - MapReduce - [issue]
...Attempts to use mapred hsadmin fail on a secure cluster for a couple of reasons. The HSAdmin client isn't configuring the principal config key for the protocol, resulting in a "Failed to spe...
http://issues.apache.org/jira/browse/MAPREDUCE-6162    Author: Jason Lowe, 2015-04-10, 21:19
[MAPREDUCE-6303] Read timeout when retrying a fetch error can be fatal to a reducer - MapReduce - [issue]
...If a reducer encounters an error trying to fetch from a node then encounters a read timeout when trying to re-establish the connection then the reducer can fail.  The read timeout excep...
http://issues.apache.org/jira/browse/MAPREDUCE-6303    Author: Jason Lowe, 2015-04-10, 21:19
[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, 2015-04-09, 22:58
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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