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[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
[MAPREDUCE-982] Deprecated DistributedCache still used in the new apis in org.apache.hadoop.mapreduce package - MapReduce - [issue]
...Deprecated DistributedCache still used in the new apis in org.apache.hadoop.mapreduce package e.g. JobContext, we should fix it....
http://issues.apache.org/jira/browse/MAPREDUCE-982    Author: Arun C Murthy, 2014-07-24, 00:37
[MAPREDUCE-970] task-controller/configuration.c:get_values is broken - MapReduce - [issue]
...task-controller/configuration.c:get_values is supposed to return a char** with the last element set to NULL.It doesn't correctly handle empty config-values, #values as an exactly multiple of...
http://issues.apache.org/jira/browse/MAPREDUCE-970    Author: Arun C Murthy, 2014-07-24, 00:31
[MAPREDUCE-922] Automatic configuration of number of map and reduce slots based on available resources for dealing with heterogenous clusters - MapReduce - [issue]
...Currently the number of map and reduce slots have to be configured manually, which is reasonable for homogeneous clusters. However, as the clusters start to change over time it becomes rathe...
http://issues.apache.org/jira/browse/MAPREDUCE-922    Author: Arun C Murthy, 2014-07-23, 23:12
[MAPREDUCE-921] Map-Reduce framework should gracefully handle heterogenous clusters - MapReduce - [issue]
...Currently several parts of the framework: components, configuration etc. implicitly assume uniformity of the cluster. This jira is meant to be a meta-issue to track various improvements nece...
http://issues.apache.org/jira/browse/MAPREDUCE-921    Author: Arun C Murthy, 2014-07-23, 23:09
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