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

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

Srimanth Gunturi created AMBARI-4999:
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             Summary: 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


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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