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https://issues.apache.org/jira/browse/YARN-10284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123401#comment-17123401
 ] 

Hadoop QA commented on YARN-10284:
----------------------------------

| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  1m 
18s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green} No case conflicting files found. {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:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 21m 
53s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
32s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
22s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
35s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 41s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
26s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  1m 
11s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  
8s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
30s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 15s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
23s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
15s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m 
30s{color} | {color:green} hadoop-yarn-server-common in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
28s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 64m 53s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://builds.apache.org/job/PreCommit-YARN-Build/26096/artifact/out/Dockerfile
 |
| JIRA Issue | YARN-10284 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13004558/YARN-10284.004.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux 244f95bd5d3a 4.15.0-101-generic #102-Ubuntu SMP Mon May 11 
10:07:26 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 9fe4c37c25b |
| Default Java | Private Build-1.8.0_252-8u252-b09-1~18.04-b09 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/26096/testReport/ |
| Max. process+thread count | 314 (vs. ulimit of 5500) |
| modules | C: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common U: 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/26096/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.12.0 https://yetus.apache.org |


This message was automatically generated.



> Add lazy initialization of LogAggregationFileControllerFactory in LogServlet
> ----------------------------------------------------------------------------
>
>                 Key: YARN-10284
>                 URL: https://issues.apache.org/jira/browse/YARN-10284
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: log-aggregation, yarn
>    Affects Versions: 3.3.0
>            Reporter: Adam Antal
>            Assignee: Adam Antal
>            Priority: Major
>         Attachments: YARN-10284.001.patch, YARN-10284.002.patch, 
> YARN-10284.003.patch, YARN-10284.004.patch
>
>
> Suppose the {{mapred}} user has no access to the remote folder. Pinging the 
> JHS if it's online in every few seconds will produce the following entry in 
> the log:
> {noformat}
> 2020-05-19 00:17:20,331 WARN 
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController:
>  Unable to determine if the filesystem supports append operation
> java.nio.file.AccessDeniedException: test-bucket: 
> org.apache.hadoop.fs.s3a.auth.NoAuthWithAWSException: There is no mapped role 
> for the group(s) associated with the authenticated user. (user: mapred)
>       at 
> org.apache.hadoop.fs.s3a.S3AUtils.translateException(S3AUtils.java:204)
> [...]
>       at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:513)
>       at 
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController.getRollOverLogMaxSize(LogAggregationIndexedFileController.java:1157)
>       at 
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController.initInternal(LogAggregationIndexedFileController.java:149)
>       at 
> org.apache.hadoop.yarn.logaggregation.filecontroller.LogAggregationFileController.initialize(LogAggregationFileController.java:135)
>       at 
> org.apache.hadoop.yarn.logaggregation.filecontroller.LogAggregationFileControllerFactory.<init>(LogAggregationFileControllerFactory.java:139)
>       at 
> org.apache.hadoop.yarn.server.webapp.LogServlet.<init>(LogServlet.java:66)
>       at 
> org.apache.hadoop.mapreduce.v2.hs.webapp.HsWebServices.<init>(HsWebServices.java:99)
>       at 
> org.apache.hadoop.mapreduce.v2.hs.webapp.HsWebServices$$FastClassByGuice$$1eb8d5d6.newInstance(<generated>)
>       at 
> com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40)
> [...]
>       at 
> org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
>       at java.lang.Thread.run(Thread.java:748)
> {noformat}
> We should only create the {{LogAggregationFactory}} instance when we actually 
> need it, not every time the {{LogServlet}} object is instantiated (so 
> definitely not in the constructor). In this way we prevent pressure on the 
> S3A auth side, especially if the authentication request is a costly operation.



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