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https://issues.apache.org/jira/browse/HBASE-5980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272073#comment-13272073
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Todd Lipcon commented on HBASE-5980:
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Yep - some proxy for the efficiency of the filter. Often, newer HBase users
apply filters expecting them to work like SQL WHERE clauses, and don't realize
that even though their scan returns only 100 rows, it in fact is reading
thousands or millions off disk.
> Scanner responses from RS should include metrics on rows/KVs filtered
> ---------------------------------------------------------------------
>
> Key: HBASE-5980
> URL: https://issues.apache.org/jira/browse/HBASE-5980
> Project: HBase
> Issue Type: Improvement
> Components: client, metrics, regionserver
> Affects Versions: 0.96.0
> Reporter: Todd Lipcon
> Priority: Minor
>
> Currently it's difficult to know, when issuing a filter, what percentage of
> rows were skipped by that filter. We should expose some basic counters back
> to the client scanner object. For example:
> - number of rows filtered by row key alone (filterRowKey())
> - number of times each filter response was returned by filterKeyValue() -
> corresponding to Filter.ReturnCode
> What would be slickest is if this could actually return a tree of counters
> for cases where FilterList or other combining filters are used. But a
> top-level is a good start.
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