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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1291) RM INFO logs limit scheduling speed
Date Thu, 10 Oct 2013 21:24:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-1291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13791999#comment-13791999
] 

Sandy Ryza commented on YARN-1291:
----------------------------------

I would like to demote the RMContainerImpl state transition log to DEBUG and use an AsyncAppender
for the RMAuditLogger (at least make this configurable if not default).
[~vinodkv], as these logs are pretty core, wanted to check what your thoughts are on this?

> 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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