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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