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From "Jim Challenger (JIRA)" <...@uima.apache.org>
Subject [jira] [Updated] (UIMA-3664) DUCC RM - rounding error allocation shares
Date Mon, 05 May 2014 15:20:15 GMT

     [ https://issues.apache.org/jira/browse/UIMA-3664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Challenger updated UIMA-3664:
---------------------------------

    Affects Version/s: 1.1.0-Ducc
        Fix Version/s: 1.1.0-Ducc

> DUCC RM - rounding error allocation shares
> ------------------------------------------
>
>                 Key: UIMA-3664
>                 URL: https://issues.apache.org/jira/browse/UIMA-3664
>             Project: UIMA
>          Issue Type: Bug
>          Components: DUCC
>    Affects Versions: 1.1.0-Ducc
>            Reporter: Jim Challenger
>            Assignee: Jim Challenger
>            Priority: Minor
>             Fix For: 1.1.0-Ducc
>
>
> During share counting on a cluster with a large spread of machine sizes (30G up to 256G),
and there are a lot of requests for 30G shares, but only a few for 45G shares, the current
code will make a rounding assumption that tends to starve the small, 45G job.
> The code needs to change to round UP, not DOWN, if the math calculating qshares has a
residual.  



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