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https://issues.apache.org/jira/browse/YARN-2768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188222#comment-14188222
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Hadoop QA commented on YARN-2768:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12677855/YARN-2768.patch
against trunk revision ec63a3f.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesApps
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-YARN-Build/5625//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5625//console
This message is automatically generated.
> optimize FSAppAttempt.updateDemand by avoid clone of Resource which takes 85%
> of computing time of update thread
> ----------------------------------------------------------------------------------------------------------------
>
> Key: YARN-2768
> URL: https://issues.apache.org/jira/browse/YARN-2768
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Reporter: Hong Zhiguo
> Assignee: Hong Zhiguo
> Priority: Minor
> Attachments: YARN-2768.patch, profiling_FairScheduler_update.png
>
>
> See the attached picture of profiling result. The clone of Resource object
> within Resources.multiply() takes up **85%** (19.2 / 22.6) CPU time of the
> function FairScheduler.update().
> The code of FSAppAttempt.updateDemand:
> {code}
> public void updateDemand() {
> demand = Resources.createResource(0);
> // Demand is current consumption plus outstanding requests
> Resources.addTo(demand, app.getCurrentConsumption());
> // Add up outstanding resource requests
> synchronized (app) {
> for (Priority p : app.getPriorities()) {
> for (ResourceRequest r : app.getResourceRequests(p).values()) {
> Resource total = Resources.multiply(r.getCapability(),
> r.getNumContainers());
> Resources.addTo(demand, total);
> }
> }
> }
> }
> {code}
> The code of Resources.multiply:
> {code}
> public static Resource multiply(Resource lhs, double by) {
> return multiplyTo(clone(lhs), by);
> }
> {code}
> The clone could be skipped by directly update the value of this.demand.
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