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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5186) Improve limit handling in fairshare scheduler
Date Wed, 03 Jun 2009 22:28:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716088#action_12716088
] 

Matei Zaharia commented on HADOOP-5186:
---------------------------------------

A note on progress for this issue: I have a tested patch that removes deficits and also adds
support for FIFO pools (but not yet lazy job init as discussed here). However, I am waiting
for HADOOP-4665 and HADOOP-4667 to be committed before posting it because it depends on those.


> Improve limit handling in fairshare scheduler
> ---------------------------------------------
>
>                 Key: HADOOP-5186
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5186
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/fair-share
>            Reporter: Hemanth Yamijala
>            Priority: Minor
>
> The fairshare scheduler has a way by which it can limit the number of jobs in a pool
by setting the maxRunningJobs parameter in its allocations definition. This limit is treated
as a hard limit, and comes into effect even if the cluster is free to run more jobs, resulting
in underutilization. Possibly the same thing happens with the parameter maxRunningJobs for
user and userMaxJobsDefault. It may help to treat these as a soft limit and run additional
jobs to keep the cluster fully utilized.

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