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https://issues.apache.org/jira/browse/HBASE-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726161#comment-13726161
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Lars Hofhansl commented on HBASE-9086:
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Wait, is that doing what you expect? The KeyOnlyFilter will emit a KV for each
KV it encounters, whereas the FirstKeyOnly filter will only emit a KV once for
each row.
So if all your rows had 3 columns, you'd get 3x the row count.
> Add some options to improve count performance
> ---------------------------------------------
>
> Key: HBASE-9086
> URL: https://issues.apache.org/jira/browse/HBASE-9086
> Project: HBase
> Issue Type: Wish
> Components: shell
> Affects Versions: 0.94.2
> Reporter: Cheney Sun
> Attachments: HBase-9086.patch
>
>
> The current count command in HBase shell is quite slow if the row size is
> very big (100+kB each). It would be helpful to provide some option to specify
> the column to count, which could give user a chance to reduce the data volume
> to scan.
> IMHO, only count the row key would be the ideal solution. Not sure how
> difficult to implement it.
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