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https://issues.apache.org/jira/browse/HBASE-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726597#action_12726597
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Jonathan Gray commented on HBASE-1481:
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Nothing has really been added though. Row counting via MR has always been
possible, we have been doing it here for a long time and the same performance
issue still exists (even with mappers = regions).
The idea behind this issue is to not have to return everything.
Let's just keep it open for now and see what comes of it for 0.20.1. This
might get swept into another larger issue.
> Add fast row key only scanning
> ------------------------------
>
> Key: HBASE-1481
> URL: https://issues.apache.org/jira/browse/HBASE-1481
> Project: Hadoop HBase
> Issue Type: Improvement
> Affects Versions: 0.19.3
> Reporter: Lars George
> Priority: Minor
> Fix For: 0.20.1, 0.21.0
>
>
> Instead of requiring a user to set up a scanner with any column and scan the
> table to gather all row keys while ignoring the column value we should have a
> fast and lightweight scanner that for example takes a "null" for the column
> list and then simply returns only the matching keys of all non-empty or
> deleted rows. Filters should still be applicable.
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