hadoop-yarn-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2410) Nodemanager ShuffleHandler can possible exhaust file descriptors
Date Tue, 08 Sep 2015 22:42:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-2410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735766#comment-14735766
] 

Hadoop QA commented on YARN-2410:
---------------------------------

\\
\\
| (/) *{color:green}+1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  15m 59s | 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 51s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  10m  7s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 21s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {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:green}+1{color} | findbugs |   0m 44s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | mapreduce tests |   0m 19s | Tests passed in hadoop-mapreduce-client-shuffle.
|
| | |  37m 47s | |
\\
\\
|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12754746/YARN-2410-v7.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d9c1fab |
| hadoop-mapreduce-client-shuffle test log | https://builds.apache.org/job/PreCommit-YARN-Build/9046/artifact/patchprocess/testrun_hadoop-mapreduce-client-shuffle.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-YARN-Build/9046/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/9046/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, YARN-2410-v7.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)

Mime
View raw message