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Posted to mapreduce-issues@hadoop.apache.org by "Vincent Behar (JIRA)" <ji...@apache.org> on 2012/12/05 14:44:58 UTC
[jira] [Created] (MAPREDUCE-4849) TaskSelector not used in
FairScheduler
Vincent Behar created MAPREDUCE-4849:
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Summary: TaskSelector not used in FairScheduler
Key: MAPREDUCE-4849
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4849
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: contrib/fair-share
Affects Versions: 1.1.1, 1.0.4
Reporter: Vincent Behar
The documentation (http://hadoop.apache.org/docs/r1.0.4/fair_scheduler.html) describes the mapred.fairscheduler.taskselector parameter as an "extension point", but while the FairScheduler does instantiate the custom TaskSelector provided this way, it does not call any of its methods (obtainNewMapTask, obtainNewReduceTask, neededSpeculativeMaps or neededSpeculativeReduces).
We should either update the FairScheduler to use the TaskSelector when scheduling a task, or completely remove the TaskSelector and update the documentation.
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