[jira] [Resolved] (AMBARI-4999) Ambari should allow at least 3 yarn containers on a one-node installation

["Srimanth Gunturi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMBARI-4999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Srimanth Gunturi resolved AMBARI-4999.
--------------------------------------

    Resolution: Fixed

+1 received. Committed to trunk.

> Ambari should allow at least 3 yarn containers on a one-node installation
> -------------------------------------------------------------------------
>
>                 Key: AMBARI-4999
>                 URL: https://issues.apache.org/jira/browse/AMBARI-4999
>             Project: Ambari
>          Issue Type: Task
>          Components: client
>    Affects Versions: 1.5.0
>            Reporter: Srimanth Gunturi
>            Assignee: Srimanth Gunturi
>             Fix For: 1.5.0
>
>         Attachments: AMBARI-4999.patch
>
>
> Ambari UI calculates ram-per-container as a fraction. 
> YARN scheduler's minimum memory is Math.round(ram-per-container), while the maximum memory is Math.round(number-of-containers * ram-percontainer). 
> The problem is that for some fractional values, 3*Math.round(fraction) > Math.round(3*fraction). (Ex: Take value 1.7). Because of that less number of containers can actually be started, as the value slightly goes over the maximum.



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