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https://issues.apache.org/jira/browse/HBASE-4926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445693#comment-13445693
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stack commented on HBASE-4926:
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@Jesse I don't think so. Trace would having timings as it crosses spans. It
wouldn't emit counts of how man KVs it interrogated. A DebugFilter that dumped
out kvs skipped, hfiles traversed, etc., sounds useful still.
> 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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