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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6610) DominantResourceCalculator.getResourceAsValue() dominant param is no longer appropriate
Date Mon, 24 Jul 2017 23:18:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099257#comment-16099257
] 

Wangda Tan commented on YARN-6610:
----------------------------------

Thanks [~templedf] for working on the patch and comments from [~sunilg]/[~yufeigu]. 

Tried to review the patch, it is already outdated, I will do a detailed review once the patch
is updated. For one thing definitely need to be updated: Existing impl creates and uses TreeSet
for every compare operation, which could be very slow according to testing of YARN-6788 (we
expect another patch to completely remove map operations in the code path of Resource). I
suggest to relook at the patch once we fill major performance gaps of YARN-3926 branch.

> DominantResourceCalculator.getResourceAsValue() dominant param is no longer appropriate
> ---------------------------------------------------------------------------------------
>
>                 Key: YARN-6610
>                 URL: https://issues.apache.org/jira/browse/YARN-6610
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: YARN-3926
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>         Attachments: YARN-6610.001.patch
>
>
> The {{dominant}} param assumes there are only two resources, i.e. true means to compare
the dominant, and false means to compare the subordinate.  Now that there are _n_ resources,
this parameter no longer makes sense.



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