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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6541) Exclude scheduled reducer memory when calculating available mapper slots from headroom to avoid deadlock
Date Thu, 27 Oct 2016 11:30:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611597#comment-15611597
] 

Hadoop QA commented on MAPREDUCE-6541:
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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 11s {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} 6m 42s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 29s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 18s {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 16s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 34s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 15s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 22s {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 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 20s {color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 15s {color} | {color:red}
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app: The patch generated
8 new + 226 unchanged - 0 fixed = 234 total (was 226) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 27s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 12s {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} findbugs {color} | {color:green} 0m 42s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 13s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m 0s {color} | {color:green}
hadoop-mapreduce-client-app in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 15s {color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 21m 34s {color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12835550/MAPREDUCE-6541.02.patch
|
| JIRA Issue | MAPREDUCE-6541 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 34acfc665c56 3.13.0-93-generic #140-Ubuntu SMP Mon Jul 18 21:21:05 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 4e403de |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6780/artifact/patchprocess/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-app.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6780/testReport/
|
| 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://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6780/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Exclude scheduled reducer memory when calculating available mapper slots from headroom
to avoid deadlock 
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6541
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6541
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Wangda Tan
>            Assignee: Varun Saxena
>         Attachments: MAPREDUCE-6541.01.patch, MAPREDUCE-6541.02.patch
>
>
> We saw a MR deadlock recently:
> - When NM restarted by framework without enable recovery, containers running on these
nodes will be identified as "ABORTED", and MR AM will try to reschedule "ABORTED" mapper containers.
> - Since such lost mappers are "ABORTED" container, MR AM gives normal mapper priority
(priority=20) to such mapper requests. If there's any pending reducer (priority=10) at the
same time, mapper requests need to wait for reducer requests satisfied.
> - In our test, one mapper needs 700+ MB, reducer needs 1000+ MB, and RM available resource
= mapper-request = (700+ MB), only one job was running in the system so scheduler cannot allocate
more reducer containers AND MR-AM thinks there're enough headroom for mapper so reducer containers
will not be preempted.
> MAPREDUCE-6302 can solve most of the problems, but in the other hand, I think we may
need to exclude scheduled reducers resource when calculating #available-mapper-slots from
headroom. Which we can avoid excessive reducer preemption.



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