[ https://issues.apache.org/jira/browse/YARN-9676?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Antal reassigned YARN-9676:
--------------------------------

    Assignee: Adam Antal

> 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
>
> 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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