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https://issues.apache.org/jira/browse/YARN-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15163327#comment-15163327
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Hadoop QA commented on YARN-4720:
---------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 16s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 
2s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 26s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 29s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
15s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 28s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
13s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 
49s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 18s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 22s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
25s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 20s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 20s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 24s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 24s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 13s 
{color} | {color:red} 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager:
 patch generated 1 new + 17 unchanged - 1 fixed = 18 total (was 18) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 25s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
10s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 0s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 15s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 20s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 8m 55s 
{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed with 
JDK v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m 22s 
{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed with 
JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
18s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 33m 44s {color} 
| {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12789595/YARN-4720.02.patch |
| JIRA Issue | YARN-4720 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux f0125aa6792a 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 |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 3369a4f |
| Default Java | 1.7.0_95 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_72 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_95 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-YARN-Build/10626/artifact/patchprocess/diff-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-nodemanager.txt
 |
| JDK v1.7.0_95  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/10626/testReport/ |
| modules | C: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 U: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/10626/console |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Skip unnecessary NN operations in log aggregation
> -------------------------------------------------
>
>                 Key: YARN-4720
>                 URL: https://issues.apache.org/jira/browse/YARN-4720
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Jun Gong
>         Attachments: YARN-4720.01.patch, YARN-4720.02.patch
>
>
> Log aggregation service could have unnecessary NN operations in the following 
> scenarios:
> * No new local log has been created since the last upload for the long 
> running service scenario.
> * NM uses {{ContainerLogAggregationPolicy}} that skips log aggregation for 
> certain containers.
> In the following code snippet, even though {{pendingContainerInThisCycle}} is 
> empty, it still creates the writer and then removes the file later. Thus it 
> introduces unnecessary create/getfileinfo/delete NN calls when NM doesn't 
> aggregate logs for an app.
>   
> {noformat}
> AppLogAggregatorImpl.java
> ......
>         writer =
>             new LogWriter(this.conf, this.remoteNodeTmpLogFileForApp,
>                 this.userUgi);
> ......
>       for (ContainerId container : pendingContainerInThisCycle) {
> ......
>       }
> ......
>             if (remoteFS.exists(remoteNodeTmpLogFileForApp)) {
>               if (rename) {
>                 remoteFS.rename(remoteNodeTmpLogFileForApp, renamedPath);
>               } else {
>                 remoteFS.delete(remoteNodeTmpLogFileForApp, false);
>               }
>             }
> ......
> {noformat}



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