[jira] [Updated] (MAPREDUCE-4385) FairScheduler.maxTasksToAssign() should check for fairscheduler.assignmultiple.maps < TaskTracker.availableSlots

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated MAPREDUCE-4385:
----------------------------------------

    Attachment: MR-4385.patch

Uploading a straight-forward patch that returns the minimum of availableSlots() and the number of tasks requested as per config file.

Testing:
- Didn't add additional tests
- Ran TestFairScheduler
                
> FairScheduler.maxTasksToAssign() should check for fairscheduler.assignmultiple.maps < TaskTracker.availableSlots
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4385
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4385
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 1.0.3
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: MR-4385.patch
>
>
> FairScheduler.maxTasksToAssign() can potentially return a value greater than the available slots. Currently, we rely on canAssignMaps()/canAssignReduces() to reject such requests.
> These additional calls can be avoided by check against the available slots in maxTasksToAssign().

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