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YARN-4690. Skip object allocation in FSAppAttempt#getResourceUsage when possible (Ming Ma via sjlee) 

(cherry picked from commit 7de70680fe)
This commit is contained in:
Sangjin Lee 2016-02-17 20:55:21 -08:00
parent 25c2597f9c
commit 23b5c71729
2 changed files with 9 additions and 1 deletions
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3
hadoop-yarn-project/CHANGES.txt
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@ -2312,6 +2312,9 @@ Release 2.6.5 - UNRELEASED
OPTIMIZATIONS
YARN-4690. Skip object allocation in FSAppAttempt#getResourceUsage when
possible (Ming Ma via sjlee)
BUG FIXES
Release 2.6.4 - 2016-02-11

7
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java
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@ -890,7 +890,12 @@ public class FSAppAttempt extends SchedulerApplicationAttempt
public Resource getResourceUsage() {
// Here the getPreemptedResources() always return zero, except in
// a preemption round
return Resources.subtract(getCurrentConsumption(), getPreemptedResources());
// In the common case where preempted resource is zero, return the
// current consumption Resource object directly without calling
// Resources.subtract which creates a new Resource object for each call.
return getPreemptedResources().equals(Resources.none()) ?
getCurrentConsumption() :
Resources.subtract(getCurrentConsumption(), getPreemptedResources());
}
@Override