[jira] [Commented] (MAPREDUCE-5773) Provide dedicated MRAppMaster syslog length limit

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917342#comment-13917342 ] 

Hadoop QA commented on MAPREDUCE-5773:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12631996/MAPREDUCE-5773.v01.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4387//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4387//console

This message is automatically generated.

> Provide dedicated MRAppMaster syslog length limit
> -------------------------------------------------
>
>                 Key: MAPREDUCE-5773
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5773
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am
>    Affects Versions: 2.3.0
>            Reporter: Gera Shegalov
>            Assignee: Gera Shegalov
>            Priority: Blocker
>             Fix For: 2.4.0
>
>         Attachments: MAPREDUCE-5773.v01.patch
>
>
> Currently mapreduce.task.userlog.limit.kb controls both the length of task attempt logs and MA-AM attempt logs. Obviously, MR-AM log is not userlog.
> We are interested in keeping MR-AM log either in its entirety or in much larger size than task logs for debugging. 
> MAPREDUCE-5672 introduced CRLA. We already use a dedicated setting for how many backups of rolled files we keep for MR-AM. However, for large jobs with tens of megabyte AM log, it means that you have a long series of files. A natural improvement is to have a configuration yarn.app.mapreduce.am.container.log.limit.kb . It allows to either disable rolling the log for altogether while keeping it for the task attempts, or to use much a larger limit to make rolling less frequent. 



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