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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10016) Make use of backward seek implemented in reverse scan support for range queries.
Date Thu, 21 Nov 2013 14:47:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828981#comment-13828981
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Anoop Sam John commented on HBASE-10016:
----------------------------------------

+1 for the idea

> Make use of backward seek implemented in reverse scan support for range queries.
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-10016
>                 URL: https://issues.apache.org/jira/browse/HBASE-10016
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>             Fix For: 0.98.0
>
>
> We can use backward seek in case of range queries based on value.
> Example:
> Lets suppose main table data as below
> row1 : c
> row2 : b
> row3 : d 
> Then in index table value will be part of rowkey.
> b: row2
> c :row1
> d: row3
> In this case first seek point we get from index table is row2 and next is row1. 
> When the current seek point is less than previous seek point then we can use backward
seek which will be supported in HBASE-4811(Support reverse Scan) which gives better performance
than closing and reseek to the lesser rowkey.



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