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YARN-1923. Make Fair Scheduler resource ratio calculations terminate faster (Anubhav Dhoot via Sandy Ryza) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1586795 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sanford Ryza 2014-04-11 23:23:33 +00:00
parent 35a5a32f17
commit 755e8c684c
2 changed files with 9 additions and 2 deletions
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3
hadoop-yarn-project/CHANGES.txt
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@ -35,6 +35,9 @@ Release 2.5.0 - UNRELEASED
YARN-1889. In Fair Scheduler, avoid creating objects on each call to
AppSchedulable comparator (Hong Zhiguo via Sandy Ryza)
YARN-1923. Make Fair Scheduler resource ratio calculations terminate faster
(Anubhav Dhoot via Sandy Ryza)
OPTIMIZATIONS
BUG FIXES

8
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/policies/ComputeFairShares.java
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@ -107,8 +107,12 @@ public static void computeShares(
double right = rMax;
for (int i = 0; i < COMPUTE_FAIR_SHARES_ITERATIONS; i++) {
double mid = (left + right) / 2.0;
if (resourceUsedWithWeightToResourceRatio(mid, schedulables, type) <
totalResource) {
int plannedResourceUsed = resourceUsedWithWeightToResourceRatio(
mid, schedulables, type);
if (plannedResourceUsed == totalResource) {
right = mid;
break;
} else if (plannedResourceUsed < totalResource) {
left = mid;
} else {
right = mid;