[jira] [Commented] (HBASE-4926) DebugFilter; counts how many KVs skipped before result found, counts storefiles we tripped over

["Jean-Daniel Cryans (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161086#comment-13161086 ] 

Jean-Daniel Cryans commented on HBASE-4926:
-------------------------------------------

It could also be used in the shell to do stuff like debug_get, debug_scan, and then it would be easy to debug performance of requests.
                
> DebugFilter; counts how many KVs skipped before result found, counts storefiles we tripped over
> -----------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4926
>                 URL: https://issues.apache.org/jira/browse/HBASE-4926
>             Project: HBase
>          Issue Type: Task
>            Reporter: stack
>
> I'm not sure this possible but chatting w/ J-D after he finished helping a crew who had a slow scan, we need ways to help folks figure out why stuff is slow on the server side.  In this case, the user had a region that had gigs of deletes in it that had to be skipped before the scanner got to a value to return so scans looked slow though working 'correctly'.  If the user could enable a DebugFilter than did counts of what Scans were skipping and size of data skipped among other things, it might help w/ the situation above -- and perhaps with others (What else could we count in a filter?)

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