[YARN-5453] FairScheduler#update may skip update demand resource of child queue/app if current demand reached maxResource

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-alpha2
• Component/s: fairscheduler
• Labels: oct16-easy
• Hadoop Flags: Reviewed
• Assignee: sandflee
• Reporter: sandflee
• Created: 30/Jul/16 15:53
• Updated: 10/Nov/16 08:34
• Resolved: 10/Nov/16 07:47

Description

      demand = Resources.createResource(0);
      for (FSQueue childQueue : childQueues) {
        childQueue.updateDemand();
        Resource toAdd = childQueue.getDemand();
        demand = Resources.add(demand, toAdd);
        demand = Resources.componentwiseMin(demand, maxRes);
        if (Resources.equals(demand, maxRes)) {
          break;
        }
      }

if one singe queue's demand resource exceed maxRes, the other queue's demand resource will not update.