[
https://issues.apache.org/jira/browse/YARN-2410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14733149#comment-14733149
]
Hadoop QA commented on YARN-2410:
---------------------------------
\\
\\
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch | 15m 44s | Pre-patch trunk compilation is
healthy. |
| {color:green}+1{color} | @author | 0m 0s | The patch does not contain any
@author tags. |
| {color:green}+1{color} | tests included | 0m 0s | The patch appears to
include 1 new or modified test files. |
| {color:green}+1{color} | javac | 7m 44s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 9m 51s | There were no new javadoc
warning messages. |
| {color:green}+1{color} | release audit | 0m 23s | The applied patch does
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle | 0m 21s | The applied patch generated
14 new checkstyle issues (total was 60, now 74). |
| {color:red}-1{color} | whitespace | 0m 1s | The patch has 1 line(s) that
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install | 1m 28s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with
eclipse:eclipse. |
| {color:red}-1{color} | findbugs | 0m 47s | The patch appears to introduce 1
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | mapreduce tests | 0m 21s | Tests passed in
hadoop-mapreduce-client-shuffle. |
| | | 37m 15s | |
\\
\\
|| Reason || Tests ||
| FindBugs | module:hadoop-mapreduce-client-shuffle |
\\
\\
|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12754414/YARN-2410-v6.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 9b68577 |
| checkstyle |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/artifact/patchprocess/diffcheckstylehadoop-mapreduce-client-shuffle.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/artifact/patchprocess/whitespace.txt
|
| Findbugs warnings |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/artifact/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-shuffle.html
|
| hadoop-mapreduce-client-shuffle test log |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/artifact/patchprocess/testrun_hadoop-mapreduce-client-shuffle.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.gq1.ygridcore.net 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 |
| Console output |
https://builds.apache.org/job/PreCommit-YARN-Build/9019/console |
This message was automatically generated.
> Nodemanager ShuffleHandler can possible exhaust file descriptors
> ----------------------------------------------------------------
>
> Key: YARN-2410
> URL: https://issues.apache.org/jira/browse/YARN-2410
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 2.5.0
> Reporter: Nathan Roberts
> Assignee: Kuhu Shukla
> Attachments: YARN-2410-v1.patch, YARN-2410-v2.patch,
> YARN-2410-v3.patch, YARN-2410-v4.patch, YARN-2410-v5.patch, YARN-2410-v6.patch
>
>
> The async nature of the shufflehandler can cause it to open a huge number of
> file descriptors, when it runs out it crashes.
> Scenario:
> Job with 6K reduces, slow start set to 0.95, about 40 map outputs per node.
> Let's say all 6K reduces hit a node at about same time asking for their
> outputs. Each reducer will ask for all 40 map outputs over a single socket in
> a
> single request (not necessarily all 40 at once, but with coalescing it is
> likely to be a large number).
> sendMapOutput() will open the file for random reading and then perform an
> async transfer of the particular portion of this file(). This will
> theoretically
> happen 6000*40=240000 times which will run the NM out of file descriptors and
> cause it to crash.
> The algorithm should be refactored a little to not open the fds until they're
> actually needed.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
