Adam Antal commented on YARN-9676:

Cherry-picking failed because YARN-8273 only got in branch-3.2 and not 

I'd rather omit the patch to branch-3.1. It is good as it is, thanks. I resolve 
this issue.

> Add DEBUG and TRACE level messages to AppLogAggregatorImpl and connected 
> classes
> --------------------------------------------------------------------------------
>                 Key: YARN-9676
>                 URL: https://issues.apache.org/jira/browse/YARN-9676
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Adam Antal
>            Assignee: Adam Antal
>            Priority: Major
>             Fix For: 3.3.0, 3.2.1
> During the development of the last items of YARN-6875, it was typically 
> difficult to extract information about the internal state of some log 
> aggregation related classes (e.g. {{AppLogAggregatiorImpl}} and 
> {{LogAggregationFileController}}). 
> On my fork I added a few more messages to those classes like:
> - displaying the number of log aggregation cycles
> - displaying the names of the files currently considered for log aggregation 
> by containers
> - immediately displaying any exception caught (and sent to the RM in the 
> diagnostic messages) during the log aggregation process.
> Those messages were quite useful for debugging if any issue occurs, but 
> otherwise it flooded the NM log file with these messages that are usually not 
> needed. I suggest to add (some of) these messages in DEBUG or TRACE level.

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