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[MAPREDUCE-1872] Re-think (user|queue) limits on (tasks|jobs) in the CapacityScheduler - MapReduce - [issue]
...We need to re-think our story to have lead to a better overall picture of having limits on {users, queues} w.r.t Jobs - limits on submission, initialization Tasks - limits per-job, per...
http://issues.apache.org/jira/browse/MAPREDUCE-1872    Author: Arun C Murthy, 2014-07-30, 21:18
[MAPREDUCE-1841] o.a.h.mapreduce.FileOutputCommitter doens't check for existence of ${mapred.output.dir}/_temporary - MapReduce - [issue]
...o.a.h.mapred.FileOutputCommitter.getWorkOutputPath checks for existence of ${mapred.output.dir}/temporary to ensure tasks launched _after the job-cleanup task fail early (in a vast majority ...
http://issues.apache.org/jira/browse/MAPREDUCE-1841    Author: Arun C Murthy, 2014-07-30, 20:57
[MAPREDUCE-1717] Topology resolution should be asynchronous - MapReduce - [issue]
...Currently we hold the JT lock while resolving topology of nodes. We need to make this asynchronous w.r.t. the JT lock....
http://issues.apache.org/jira/browse/MAPREDUCE-1717    Author: Arun C Murthy, 2014-07-30, 19:09
[MAPREDUCE-1689] Write MR wire protocols in Avro IDL - MapReduce - [issue]
...As part of the the move to AVRO and wire compatibility, write all Map-Reduce protocols in AVRO IDL. This is analogous to HDFS-1069....
http://issues.apache.org/jira/browse/MAPREDUCE-1689    Author: Arun C Murthy, 2014-07-30, 18:10
[MAPREDUCE-1521] Protection against incorrectly configured reduces - MapReduce - [issue]
...We've seen a fair number of instances where naive users process huge data-sets (>10TB) with badly mis-configured #reduces e.g. 1 reduce.This is a significant problem on large clusters sin...
http://issues.apache.org/jira/browse/MAPREDUCE-1521    Author: Arun C Murthy, 2014-07-30, 00:35
[MAPREDUCE-1485] CapacityScheduler should have prevent a single job taking over large parts of a cluster - MapReduce - [issue]
...The proposal is to have a per-queue limit on the number of concurrent tasks a job can run on a cluster. We've seen cases where a single, large, job took over a majority of the cluster - wors...
http://issues.apache.org/jira/browse/MAPREDUCE-1485    Author: Arun C Murthy, 2014-07-30, 00:31
[MAPREDUCE-1261] Enhance mumak to implement a 'stress-test' for the JobTracker - MapReduce - [issue]
...I propose we enhance mumak to implement a proper 'stress-test' tool for the JobTracker. The idea is that we enhance mumak to have a mode where it can use the real JobTracker (and Scheduler o...
http://issues.apache.org/jira/browse/MAPREDUCE-1261    Author: Arun C Murthy, 2014-07-29, 21:58
[MAPREDUCE-1192] Use the DistributedCache for job.xml and job.jar - MapReduce - [issue]
...It would be more efficient if we used the DistributedCache for a job's configuration and jars....
http://issues.apache.org/jira/browse/MAPREDUCE-1192    Author: Arun C Murthy, 2014-07-29, 20:59
[MAPREDUCE-1015] Map-Reduce interface classification - MapReduce - [issue]
...HADOOP-5073 introduced the ability to classify apis wrt scope and stability. We should do a sweep over the Map-Reduce apis and classify them accordingly....
http://issues.apache.org/jira/browse/MAPREDUCE-1015    Author: Arun C Murthy, 2014-07-24, 01:11
[MAPREDUCE-989] Allow segregation of DistributedCache for maps and reduces - MapReduce - [issue]
...Applications might have differing needs for files in the DistributedCache wrt maps and reduces. We should allow them to specify them separately....
http://issues.apache.org/jira/browse/MAPREDUCE-989    Author: Arun C Murthy, 2014-07-24, 00:49
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