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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-6976) Change assignment related logging to TRACE level
Date Fri, 19 Oct 2012 23:58:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jimmy Xiang resolved HBASE-6976.
--------------------------------

    Resolution: Won't Fix

Based on my testing on the latest trunk code, turning off the logging seems not to help the
assignment performance very much.  This may be because the code has been changed a lot, compared
to 0.94. We can look into this again if we have clear proof this will improve the performance.
                
> Change assignment related logging to TRACE level
> ------------------------------------------------
>
>                 Key: HBASE-6976
>                 URL: https://issues.apache.org/jira/browse/HBASE-6976
>             Project: HBase
>          Issue Type: Improvement
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Priority: Minor
>              Labels: noob
>
> As JD and Elliot mentioned, turning off ZKAssign logging can improve AM performance a
lot.  During the testing, I also noticed that: after all regions are already opened, master
UI still shows lots of regions in transition. It is because AM hasn't finished the ZK event
processing yet.
> Changing the logging level from debug to trace will improve AM performance. With HBASE-6611,
I think AM is getting stable and reliable. I hope we don't need to see these logging any more.
> The logging is still available after turning trace logging level on for AM and ZKAssign
class.

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