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YARN-7397. Reduce lock contention in FairScheduler#getAppWeight() 

(cherry picked from commit e62bbbca7a)
This commit is contained in:
Daniel Templeton 2017-10-28 09:13:13 -07:00
parent c818c85238
commit ab93bf5b00
1 changed files with 9 additions and 6 deletions
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15
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
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@ -369,17 +369,20 @@ public class FairScheduler extends
}
public float getAppWeight(FSAppAttempt app) {
try {
double weight = 1.0;
if (sizeBasedWeight) {
readLock.lock();
double weight = 1.0;
if (sizeBasedWeight) {
try {
// Set weight based on current memory demand
weight = Math.log1p(app.getDemand().getMemorySize()) / Math.log(2);
} finally {
readLock.unlock();
}
return (float)weight * app.getPriority().getPriority();
} finally {
readLock.unlock();
}
return (float)weight * app.getPriority().getPriority();
}
public Resource getIncrementResourceCapability() {