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Posted to yarn-issues@hadoop.apache.org by "Botong Huang (JIRA)" <ji...@apache.org> on 2017/10/11 21:14:00 UTC

[jira] [Updated] (YARN-7317) Fix overallocation resulted from ceiling in LocalityMulticastAMRMProxyPolicy

     [ https://issues.apache.org/jira/browse/YARN-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Botong Huang updated YARN-7317:
-------------------------------
    Attachment: YARN-7317.v1.patch

> Fix overallocation resulted from ceiling in LocalityMulticastAMRMProxyPolicy
> ----------------------------------------------------------------------------
>
>                 Key: YARN-7317
>                 URL: https://issues.apache.org/jira/browse/YARN-7317
>             Project: Hadoop YARN
>          Issue Type: Task
>            Reporter: Botong Huang
>            Assignee: Botong Huang
>            Priority: Minor
>         Attachments: YARN-7317.v1.patch
>
>
> When LocalityMulticastAMRMProxyPolicy is splitting up the ANY requests into different subclusters, we are doing Ceil(N * weight), leading to overallocation overall. It is better to do Floor(N * weight) for each subcluster and then assign the residue randomly according to the weights. So that the total number of containers we ask from all subclusters sum up to be N. 



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