Hudson commented on YARN-10312:

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #18346 (See 
YARN-10312. Add support for yarn logs -logFile to retain backward (ebadger: rev 
* (edit) 
* (edit) 

> Add support for yarn logs -logFile to retain backward compatibility
> -------------------------------------------------------------------
>                 Key: YARN-10312
>                 URL: https://issues.apache.org/jira/browse/YARN-10312
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.10.0, 3.4.1
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>              Labels: compatibility
>         Attachments: YARN-10312.001.patch
> The YARN CLI logs command line option {{-logFiles}} was changed to 
> {{-log_files}}  in 2.9 and later releases.   This change was made as part of 
> YARN-5363.
> Verizon Media is in the process of moving from Hadoop-2.8 to Hadoop-2.10, and 
> while testing integration with Spark, we ran into this issue.   We are 
> concerned that we will run into more cases of this as we roll out to 
> production, and rather than break user scripts, we'd prefer to add 
> {{-logFiles}} as an alias of {{-log_files}}.  If both are provided, 
> {{-logFiles}} will be ignored.

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