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[MAPREDUCE-292] Pin reduces with consecutive IDs to nodes and have a single shuffle task per job per node - MapReduce - [issue]
...The idea is to reduce disk seeks while fetching the map outputs. If we opportunistically pin reduces with consecutive IDs (like 5, 6, 7 .. max-reduce-tasks on that node) on a node, and have ...
http://issues.apache.org/jira/browse/MAPREDUCE-292    Author: Devaraj Das, 2009-06-20, 07:51
[MAPREDUCE-286] Optimize the last merge of the map output files - MapReduce - [issue]
...In ReduceTask, today we do merges of io.sort.factor number of files everytime we merge and write the result back to disk. The last merge can probably be better. For example, if there are io....
http://issues.apache.org/jira/browse/MAPREDUCE-286    Author: Devaraj Das, 2009-06-20, 07:51
[MAPREDUCE-261] Blacklisting of TaskTrackers should take into account the user-ID - MapReduce - [issue]
...With HADOOP-4305, it is possible to blacklist TaskTrackers across jobs. It might make sense to also take into account the users whose tasks are being run on the TaskTrackers, and use it in t...
http://issues.apache.org/jira/browse/MAPREDUCE-261    Author: Devaraj Das, 2009-06-20, 07:51
[MAPREDUCE-192] In TaskTracker, the notification for waking up the completion-events fetcher thread may be lost - MapReduce - [issue]
...In the TaskTracker, there is a completion events fetcher thread that fetches new events from the JobTracker. Normally, the fetcher thread would sleep for heartbeatInterval amount of time per...
http://issues.apache.org/jira/browse/MAPREDUCE-192    Author: Devaraj Das, 2009-06-20, 07:51
[MAPREDUCE-196] Create enum for the TaskTypes (Map, Reduce, JobSetup, JobCleanup, TaskCleanup) - MapReduce - [issue]
...Create enum for the TaskTypes - Map, Reduce, JobSetup, JobCleanup, TaskCleanup. Change the framework to use these enum constants and remove usages of booleans like isMap....
http://issues.apache.org/jira/browse/MAPREDUCE-196    Author: Devaraj Das, 2009-06-20, 07:51
[MAPREDUCE-159] Reduce the number of progress calls in the merge code - MapReduce - [issue]
...The number of Progressable.progress calls in the merge code should be reduced. Specifically, MergeQueue.lessThan has a progress call that accounts for ~8% of the CPU of a running reducer....
http://issues.apache.org/jira/browse/MAPREDUCE-159    Author: Devaraj Das, 2009-06-20, 07:50
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