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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9086) Add some options to improve count performance
Date Sun, 04 Aug 2013 01:37:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728721#comment-13728721
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Lars Hofhansl commented on HBASE-9086:
--------------------------------------

bq. "FirstKeyOnly" should have been named "FirstRowOnly" and "FirstKeyOnly"

Well... It does not return a row, but the first KeyValue on the row. A FilterList of FirstKeyOnlyFilter
and KeyOnlyFilter might work, just need to try to make sure. Probably just needs a unit test
to make sure.
                
> 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, HBase-9086_v0.2.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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