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https://issues.apache.org/jira/browse/HBASE-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726588#action_12726588
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Lars George commented on HBASE-1481:
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This was filed back then after a discussion on IRC between - I think - you and
me and maybe Stack. For me this was for a faster row counting. Especially in
the shell, which is quite slow because it is a sequential scan.
For the faster MR variant we have the RowCounter driver class in the hbase.jar,
which now uses as many mappers as the table has regions. The legacy "mapred"
one seemed to have default to the 1 mapper setting from the hadoop configs.
With that in place I am not sure if we need this issue still being open.
> 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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