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

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.0
• Fix Version/s: 1.5.0
• Component/s: ambari-web
• Assignee: Srimanth Gunturi
• Reporter: Srimanth Gunturi
• Created: 07/Mar/14 21:24
• Updated: 07/Mar/14 23:19
• Resolved: 07/Mar/14 23:18

Description

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.