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[MAPREDUCE-802] Simplify the job updated event notification between Jobtracker and schedulers - MapReduce - [issue]
...HADOOP-4053 and HADOOP-4149 added events to take care of updates to the state / property of a job like the run state / priority of a job notified to the scheduler. We've seen some issues wit...
http://issues.apache.org/jira/browse/MAPREDUCE-802    Author: Hemanth Yamijala, 2009-08-28, 05:16
[MAPREDUCE-897] Provide information captured as part of JobTrackerStatistics via the Hadoop metrics API - MapReduce - [issue]
...MAPREDUCE-467 introduced a framework to collect statistics per node on a fixed set of intervals. Presently there is support for collecting statistics related to number of task failures and a...
http://issues.apache.org/jira/browse/MAPREDUCE-897    Author: Hemanth Yamijala, 2009-08-21, 04:37
[MAPREDUCE-67] Few tasks failed while creating the work directory for a job, when job tracker was restarted - MapReduce - [issue]
...A randomwriter job was running when the job tracker restarted. After the jobtracker restarted, some tasktrackers were sent a reinit action. After this, some new tasks of the random writer we...
http://issues.apache.org/jira/browse/MAPREDUCE-67    Author: Hemanth Yamijala, 2009-08-11, 05:39
[MAPREDUCE-539] Implement a config validator tool for the capacity scheduler - MapReduce - [issue]
...The capacity scheduler sanity checks configuration when it starts and halts if there are any problems found. For ease of deployment, it would help to have a simple utility that will validate...
http://issues.apache.org/jira/browse/MAPREDUCE-539    Author: Hemanth Yamijala, 2009-07-29, 08:47
[MAPREDUCE-803] Provide a command line option to clean up jobtracker system directory - MapReduce - [issue]
...When the JT is restarted, the mapreduce system directory's contents are used for job recovery. For sites that use this feature, there might be instances when we don't want to restart to read...
http://issues.apache.org/jira/browse/MAPREDUCE-803    Author: Hemanth Yamijala, 2009-07-28, 06:05
[MAPREDUCE-762] Task's process trees may not be killed if a TT is restarted - MapReduce - [issue]
...Some work has been done to make sure the tasktrackers kill process trees of tasks when they finish (either successfully, or with failures or when they are killed). Related JIRAs are HADOOP-2...
http://issues.apache.org/jira/browse/MAPREDUCE-762    Author: Hemanth Yamijala, 2009-07-16, 07:30
[MAPREDUCE-3] Set mapred.child.ulimit automatically to the value of the RAM limits for a job, if they are set - MapReduce - [issue]
...Memory based monitoring and scheduling allow users to set memory limits for the tasks of their jobs. This parameter is the total memory taken by the task, and any children it may launch (for...
http://issues.apache.org/jira/browse/MAPREDUCE-3    Author: Hemanth Yamijala, 2009-07-11, 00:51
[MAPREDUCE-537] Instrument events in the capacity scheduler for collecting metrics information - MapReduce - [issue]
...We need to instrument various events in the capacity scheduler so that we can collect metrics about them. This data will help us determine improvements to scheduling strategies itself....
http://issues.apache.org/jira/browse/MAPREDUCE-537    Author: Hemanth Yamijala, 2009-07-01, 05:00
[MAPREDUCE-550] Add support for scheduling jobs based on memory requirements to the Fairscheduler - MapReduce - [issue]
...In HADOOP-3759, we added the ability for users to specify jobs requesting for a certain amount of virtual memory. For e.g. users can say that their jobs require 2GB of memory to run. In HADO...
http://issues.apache.org/jira/browse/MAPREDUCE-550    Author: Hemanth Yamijala, 2009-06-20, 08:01
[MAPREDUCE-554] Improve limit handling in fairshare scheduler - MapReduce - [issue]
...The fairshare scheduler has a way by which it can limit the number of jobs in a pool by setting the maxRunningJobs parameter in its allocations definition. This limit is treated as a hard li...
http://issues.apache.org/jira/browse/MAPREDUCE-554    Author: Hemanth Yamijala, 2009-06-20, 08:01
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