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https://issues.apache.org/jira/browse/YARN-2768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525672#comment-14525672
]
Hadoop QA commented on YARN-2768:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch | 14m 38s | Pre-patch trunk compilation is
healthy. |
| {color:green}+1{color} | @author | 0m 0s | The patch does not contain any
@author tags. |
| {color:red}-1{color} | tests included | 0m 0s | 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{color} | javac | 7m 34s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 9m 37s | There were no new javadoc
warning messages. |
| {color:green}+1{color} | release audit | 0m 22s | The applied patch does
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle | 1m 14s | The applied patch generated 1
new checkstyle issues (total was 6, now 7). |
| {color:green}+1{color} | whitespace | 0m 0s | The patch has no lines that
end in whitespace. |
| {color:green}+1{color} | install | 1m 37s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 2m 38s | The patch does not introduce
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | yarn tests | 1m 57s | Tests passed in
hadoop-yarn-common. |
| {color:green}+1{color} | yarn tests | 52m 8s | Tests passed in
hadoop-yarn-server-resourcemanager. |
| | | 92m 33s | |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12677855/YARN-2768.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / e8d0ee5 |
| checkstyle |
https://builds.apache.org/job/PreCommit-YARN-Build/7668/artifact/patchprocess/diffcheckstylehadoop-yarn-common.txt
|
| hadoop-yarn-common test log |
https://builds.apache.org/job/PreCommit-YARN-Build/7668/artifact/patchprocess/testrun_hadoop-yarn-common.txt
|
| hadoop-yarn-server-resourcemanager test log |
https://builds.apache.org/job/PreCommit-YARN-Build/7668/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-YARN-Build/7668/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf903.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output |
https://builds.apache.org/job/PreCommit-YARN-Build/7668/console |
This message was 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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