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[MAPREDUCE-330] Log information regarding changes to job in jobtracker - MapReduce - [issue]
...Some actions like changing the priority of a job, killing a job, killing a task may need to be tracked for admin purposes. It would be good to, at a minimum, log these at an INFO level in th...
http://issues.apache.org/jira/browse/MAPREDUCE-330    Author: Hemanth Yamijala, 2014-07-21, 22:54
[MAPREDUCE-246] Job recovery should fail or kill a job that fails ACL checks upon restart, if the job was running previously - MapReduce - [issue]
...Consider a scenario where a job was submitted to the M/R system and runs for a while. Then say the JT is restarted, and before that the ACLs for the user are changed so that that user can no...
http://issues.apache.org/jira/browse/MAPREDUCE-246    Author: Hemanth Yamijala, 2014-07-21, 22:49
[MAPREDUCE-317] Submitting job information via DFS in Map/Reduce causing consistency and performance issues - MapReduce - [issue]
...Job submission involves two steps: submitting jobs to the System directory on DFS (done by the client), then submit the job via the JobSubmissionProtocol to JobTracker. This two step process...
http://issues.apache.org/jira/browse/MAPREDUCE-317    Author: Hemanth Yamijala, 2014-07-21, 22:14
[MAPREDUCE-555] Provide an option to turn off priorities in jobs - MapReduce - [issue]
...The fairshare scheduler can define pools mapping to queues (as defined in the capacity scheduler - HADOOP-3445). When used in this manner, one can imagine queues set up to be used by users w...
http://issues.apache.org/jira/browse/MAPREDUCE-555    Author: Hemanth Yamijala, 2014-07-21, 20:46
[MAPREDUCE-314] Avoid priority inversion that could result due to scheduling running jobs in an order sorted by priority - MapReduce - [issue]
...Consider a job, J1, with priority NORMAL that is running reduce tasks occupying all reduce slots and has running and pending map tasks. At this point, suppose a job, J2, is submitted with pr...
http://issues.apache.org/jira/browse/MAPREDUCE-314    Author: Hemanth Yamijala, 2014-07-21, 17:44
[MAPREDUCE-507] Have backlinks from history pages to main jobtracker page - MapReduce - [issue]
...When we go from jobtracker.jsp to the job history page, and from then on to any other page in history, there is no way to go back to the jobtracker page. It would be nice to add this....
http://issues.apache.org/jira/browse/MAPREDUCE-507    Author: Hemanth Yamijala, 2014-07-19, 00:59
[MAPREDUCE-534] Provide accounting functionality for Hadoop resource manager - MapReduce - [issue]
...HADOOP-3421 describes requirements for a new resource manager in Hadoop to schedule Map/Reduce jobs. In production systems, it would be useful to produce accounting information related to th...
http://issues.apache.org/jira/browse/MAPREDUCE-534    Author: Hemanth Yamijala, 2014-07-18, 18:46
[MAPREDUCE-274] Hadoop JobClient can return specific exit codes for specific classes of exceptions - MapReduce - [issue]
...Today if a job tracker becomes unresponsive or dies, the hadoop JobClient throws an exception subclass of IOException and exits with an exit code of 1. However, it would probably fail with t...
http://issues.apache.org/jira/browse/MAPREDUCE-274    Author: Hemanth Yamijala, 2014-07-17, 21:57
[MAPREDUCE-229] Provide a command line option to check if a Hadoop jobtracker is idle - MapReduce - [issue]
...This is an RFE for providing a way to determine from the hadoop command line whether a jobtracker is idle. One possibility is to have something like hadoop jobtracker -idle <time>. Had...
http://issues.apache.org/jira/browse/MAPREDUCE-229    Author: Hemanth Yamijala, 2014-07-17, 19:42
Re: Which version of Hadoop - MapReduce - [mail # user]
...2.x.x provides NN high availability. http://hadoop.apache.org/docs/r2.0.3-alpha/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailabilityWithQJM.html  However, it is in alpha stage right now. &...
   Author: Hemanth Yamijala, 2013-04-20, 12:10
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