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[MAPREDUCE-241] JobQueueTaskScheduler could assign multiple reduces per heartbeat - MapReduce - [issue]
...Currently the JobQueueTaskScheduler assigns only 1 reduce per heartbeat, for applications where latency is important we could assign more reduces (upto available slots)....
http://issues.apache.org/jira/browse/MAPREDUCE-241    Author: Arun C Murthy, 2014-07-21, 19:32
[MAPREDUCE-538] Port HADOOP-4667 to teh capacity scheduler - MapReduce - [issue]
...HADOOP-4667 has implemented 'global scheduling' for the fair-share scheduler with very promising results - we should port the same to the capacity scheduler....
http://issues.apache.org/jira/browse/MAPREDUCE-538    Author: Arun C Murthy, 2014-07-21, 19:18
[MAPREDUCE-312] Port HADOOP-4667 to the default Map-Reduce scheduler - MapReduce - [issue]
...HADOOP-4667 has implemented 'global scheduling' for the fair-share scheduler with very promising results - we should port the same to the default o.a.h.mapred.JobQueueTaskScheduler....
http://issues.apache.org/jira/browse/MAPREDUCE-312    Author: Arun C Murthy, 2014-07-21, 19:18
[MAPREDUCE-291] Optionally a separate daemon should serve JobHistory - MapReduce - [issue]
...Currently the JobTracker serves the JobHistory to end-users off files local-disk/hdfs. While running very large clusters with a large user-base might result in lots of traffic for job-histor...
http://issues.apache.org/jira/browse/MAPREDUCE-291    Author: Arun C Murthy, 2014-07-21, 19:13
[MAPREDUCE-189] Change Map-Reduce framework to use JAAS instead of UGI - MapReduce - [issue]
...Hadoop embraced JAAS via HADOOP-4348.We need to fix Map-Reduce to use JAAS concepts such as Subject, Principal, Permission etc. rather than UserGroupInformation for user identification, queu...
http://issues.apache.org/jira/browse/MAPREDUCE-189    Author: Arun C Murthy, 2014-07-21, 18:16
[MAPREDUCE-288] Documention for using external profilers on Map-Reduce applications - MapReduce - [issue]
...We should document the usage of external profilers such as YourKit/NetBeans on Map-Reduce tasks in http://hadoop.apache.org/core/docs/current/mapred_tutorial.html#Profiling. Specifically the...
http://issues.apache.org/jira/browse/MAPREDUCE-288    Author: Arun C Murthy, 2014-07-21, 17:34
[MAPREDUCE-138] Rework job-setup and job-cleanup tasks - MapReduce - [issue]
...Currently we have a notion of map-{setup|cleanup} TIP and reduce-{setup|cleanup} TIP of which only 1 setup and cleanup tasks are picked by the JobInProgress. Also a lot of state-mainten...
http://issues.apache.org/jira/browse/MAPREDUCE-138    Author: Arun C Murthy, 2014-07-19, 20:00
[MAPREDUCE-387] Hadoop Pipes Submitter assumes that presence of a Java InputFormat implies a Java RecordReader - MapReduce - [issue]
...The Submitter's command line parsing makes this assumption, which might not be true always......
http://issues.apache.org/jira/browse/MAPREDUCE-387    Author: Arun C Murthy, 2014-07-18, 21:55
[MAPREDUCE-82] Revert the temporary change made to collection of Job's metrics done by HADOOP-3521 - MapReduce - [issue]
...HADOOP-3521 is a temporary fix, it needs to be reverted....
http://issues.apache.org/jira/browse/MAPREDUCE-82    Author: Arun C Murthy, 2014-07-18, 19:22
[MAPREDUCE-606] Implement a binary input/output format for Streaming - MapReduce - [issue]
...Lots of streaming applications process textual data with 1 record per line and fields separated by a delimiter. It turns out that there is no point in using any of Hadoop's input/output form...
http://issues.apache.org/jira/browse/MAPREDUCE-606    Author: Arun C Murthy, 2014-07-18, 06:09
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