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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1481) Add fast row key only scanning
Date Wed, 01 Jul 2009 06:18:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725941#action_12725941
] 

Jonathan Gray commented on HBASE-1481:
--------------------------------------

You say that filters should still be applicable.  Running the filter checks means disassembling
the entire KV and would get rid of much of the potential optimizations.

I saw the core use case of this being row counting.  Other uses for something like this might
be satisfied elsewhere moving forward.

What use cases are you thinking?  Basically, COUNT() operations with filters to allow counting
various things?

> 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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