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https://issues.apache.org/jira/browse/MAPREDUCE-7309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238204#comment-17238204
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Hadoop QA commented on MAPREDUCE-7309:
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 24m 
43s{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:blue}0{color} | {color:blue} codespell {color} | {color:blue}  0m  
0s{color} |  | {color:blue} codespell was not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} |  | {color:green} The patch does not contain any @author tags. 
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| {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} 32m 
56s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
38s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
34s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
30s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
38s{color} |  | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 18s{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 
31s{color} |  | {color:green} trunk passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
29s{color} |  | {color:green} trunk passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  1m  
1s{color} |  | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  
0s{color} |  | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
32s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
29s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
29s{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 with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {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} blanks {color} | {color:green}  0m  
0s{color} |  | {color:green} The patch has no blanks issues. {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
21s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
28s{color} |  | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m  8s{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 
25s{color} |  | {color:green} the patch passed with JDK 
Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{color} |  | {color:green} the patch passed with JDK Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m  
1s{color} |  | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 
21s{color} |  | {color:green} hadoop-mapreduce-client-app in the patch passed. 
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| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
33s{color} |  | {color:green} The patch does not generate ASF License warnings. 
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| {color:black}{color} | {color:black} {color} | {color:black}107m  9s{color} | 
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/40/artifact/out/Dockerfile
 |
| JIRA Issue | MAPREDUCE-7309 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13015936/MAPREDUCE-7309-005.patch
 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle codespell |
| uname | Linux 22317cb3740d 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 5fee95076b578e0e5d4fc0c8c92af8221e2d0efa |
| Default Java | Private Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.18.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_275-8u275-b01-0ubuntu1~18.04-b01 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/40/testReport/ |
| Max. process+thread count | 681 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/40/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Improve performance of reading resource request for mapper/reducers from 
> config
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7309
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7309
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: applicationmaster
>    Affects Versions: 3.0.0, 3.1.0, 3.2.0, 3.3.0
>            Reporter: Wangda Tan
>            Assignee: Peter Bacsko
>            Priority: Major
>         Attachments: MAPREDUCE-7309-003.patch, MAPREDUCE-7309-004.patch, 
> MAPREDUCE-7309-005.patch, MAPREDUCE-7309.001.patch, MAPREDUCE-7309.002.patch
>
>
> This is an issue could affect all the releases which includes YARN-6927. 
> Basically, we use regex match repeatly when we read mapper/reducer resource 
> request from config files. When we have large config file, and large number 
> of splits, it could take a long time.  
> We saw AM could take hours to parse config when we have 200k+ splits, with a 
> large config file (hundreds of kbs). 
> We should do proper caching for pre-configured resource requests.



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