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https://issues.apache.org/jira/browse/MAPREDUCE-7453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763092#comment-17763092
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ASF GitHub Bot commented on MAPREDUCE-7453:
-------------------------------------------
zhengchenyu opened a new pull request, #6042:
URL: https://github.com/apache/hadoop/pull/6042
### Description of PR
Since [HADOOP-18649](https://issues.apache.org/jira/browse/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:
```
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.
```
> Note: log4j.appender.{APPENDER}.MaxFileSize is not set before, then use
default value 10M, so no problem before
[HADOOP-18649](https://issues.apache.org/jira/browse/HADOOP-18649)
### How was this patch tested?
test in cluster.
### For code changes:
just fix default value to avoid missing logs.
> 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
>
> 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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