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https://issues.apache.org/jira/browse/MAPREDUCE-7453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17770633#comment-17770633
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ASF GitHub Bot commented on MAPREDUCE-7453:
-------------------------------------------

zhengchenyu commented on PR #6102:
URL: https://github.com/apache/hadoop/pull/6102#issuecomment-1741619676

   > Another observation, the day this PR was reverted, some tests which were 
broken since eternity broke again. 
https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/1355/ & 
with this PR in they were passing: 
https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/1354/testReport/junit/org.apache.hadoop.mapreduce.v2/TestMRJobs/testThreadDumpOnTaskTimeout/
   > 
   > So, some way this fixes those tests, that we should anyway fix
   
   @ayushtkn 
   It looks strange! Since we have revert it, should not fail. Do we have this 
error in other PR?




> Container logs are missing when yarn.app.container.log.filesize is set to 
> default value 0.
> ------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7453
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7453
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 3.3.6
>            Reporter: zhengchenyu
>            Assignee: zhengchenyu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> Since HADOOP-18649, in container-log4j.properties, 
> log4j.appender.\{APPENDER}.MaxFileSize is set to 
> ${yarn.app.container.log.filesize}, but yarn.app.container.log.filesize is 0 
> in default. So log is missing. This log is always rolling and only show the 
> latest log.
> This is the running log like below:
> {code:java}
> Log Type: syslog
> Log Upload Time: Fri Sep 08 11:36:09 +0800 2023
> Log Length: 0
> Log Type: syslog.1
> Log Upload Time: Fri Sep 08 11:36:09 +0800 2023
> Log Length: 179
> 2023-09-08 11:31:34,494 INFO [AsyncDispatcher event handler] 
> org.apache.hadoop.yarn.util.RackResolver: Got an error when resolve 
> hostNames. Falling back to /default-rack for all.  {code}
> Note: log4j.appender.\{APPENDER}.MaxFileSize is not set before, then use 
> default value 10M, so no problem before HADOOP-18649



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