Varun Saxena commented on YARN-1291:

Hi [~sandyr], I had raised YARN-2287 which is also about printing of too many 
RM Audit logs in critical flow. For this, in the patch, I had added support for 
printing audit logs at different log levels and changed container logs in RM 
and NM to DEBUG. I didnt remove the audit logs as I wasnt sure if these audit 
logs are really required or not.  

> RM INFO logs limit scheduling speed
> -----------------------------------
>                 Key: YARN-1291
>                 URL: https://issues.apache.org/jira/browse/YARN-1291
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.2.0
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
> I've been running some microbenchmarks to see how fast the Fair Scheduler can 
> fill up a cluster and found its performance is significantly hampered by 
> logging.
> I tested with 500 (mock) nodes, and found that:
> * Taking out fair scheduler INFO logs on the critical path brought down the 
> latency from 14000 ms to 6000 ms
> * Taking out the INFO that RMContainerImpl logs when a container transitions 
> brought it down from 6000 ms to 4000 ms
> * Taking out RMAuditLogger logs brought it down from 4000 ms to 1700 ms

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