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https://issues.apache.org/jira/browse/MAPREDUCE-6622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158010#comment-15158010
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Hadoop QA commented on MAPREDUCE-6622:
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| (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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 10s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 
47s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m 16s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m 1s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
25s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 25s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
39s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 
32s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 15s 
{color} | {color:green} trunk passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 10s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 10s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 
11s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m 13s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 2m 13s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m 0s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 2m 0s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
24s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 19s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
34s {color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s 
{color} | {color:red} The patch has 2 line(s) that end in whitespace. Use git 
apply --whitespace=fix. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m 1s 
{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 
16s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 8s 
{color} | {color:green} the patch passed with JDK v1.8.0_72 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 7s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 26s 
{color} | {color:green} hadoop-mapreduce-client-core in the patch passed with 
JDK v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 52s 
{color} | {color:green} hadoop-mapreduce-client-common in the patch passed with 
JDK v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 6m 29s 
{color} | {color:green} hadoop-mapreduce-client-hs in the patch passed with JDK 
v1.8.0_72. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 24s 
{color} | {color:green} hadoop-mapreduce-client-core in the patch passed with 
JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 51s 
{color} | {color:green} hadoop-mapreduce-client-common in the patch passed with 
JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 6m 13s 
{color} | {color:green} hadoop-mapreduce-client-hs in the patch passed with JDK 
v1.7.0_95. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m 21s 
{color} | {color:red} Patch generated 14 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 54m 18s {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/12789079/MAPREDUCE-6622.004.patch
 |
| JIRA Issue | MAPREDUCE-6622 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  xml  |
| uname | Linux 576b1d5b719f 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 / 66289a3 |
| 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 |
| whitespace | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6341/artifact/patchprocess/whitespace-eol.txt
 |
| JDK v1.7.0_95  Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6341/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6341/artifact/patchprocess/patch-asflicense-problems.txt
 |
| modules | C:  
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core   
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common 
  hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs  
U: hadoop-mapreduce-project/hadoop-mapreduce-client |
| Console output | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6341/console |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Add capability to set JHS job cache to a task-based limit
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-6622
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6622
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver
>    Affects Versions: 2.7.2
>            Reporter: Ray Chiang
>            Assignee: Ray Chiang
>              Labels: supportability
>         Attachments: MAPREDUCE-6622.001.patch, MAPREDUCE-6622.002.patch, 
> MAPREDUCE-6622.003.patch, MAPREDUCE-6622.004.patch
>
>
> When setting the property mapreduce.jobhistory.loadedjobs.cache.size the jobs 
> can be of varying size.  This is generally not a problem when the jobs sizes 
> are uniform or small, but when the job sizes can be very large (say greater 
> than 250k tasks), then the JHS heap size can grow tremendously.
> In cases, where multiple jobs are very large, then the JHS can lock up and 
> spend all its time in GC.  However, since the cache is holding on to all the 
> jobs, not much heap space can be freed up.
> By setting a property that sets a cap on the number of tasks allowed in the 
> cache and since the total number of tasks loaded is directly proportional to 
> the amount of heap used, this should help prevent the JHS from locking up.



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