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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5512) Add support for INCLUDE_AND_SEEK_USING_HINT
Date Wed, 15 Jan 2014 22:00:19 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-5512:
---------------------------------

    Assignee:     (was: Lars Hofhansl)

> Add support for INCLUDE_AND_SEEK_USING_HINT
> -------------------------------------------
>
>                 Key: HBASE-5512
>                 URL: https://issues.apache.org/jira/browse/HBASE-5512
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>         Attachments: 5512-v2.txt, 5512.txt
>
>
> This came up from HBASE-2038
> From Anoop:
> - What we wanted from the filter is include a row and then seek to the next row which
we are interested in. I cant see such a facility with our Filter right now. Correct me if
I am wrong. So suppose we already seeked to one row and this need to be included in the result,
then the Filter should return INCLUDE. Then when the next next() call happens, then only we
can return a SEEK_USING_HINT. So one extra row reading is needed. This might create even one
unwanted HFileBlock fetch (who knows).
> Can we add reseek() at higher level?
> From Lars:
> Yep, for that we'd need to add INCLUDE_AND_SEEK_USING_HINT (similar to the INCLUDE_AND_SEEK_NEXT_ROW
that we already have). Shouldn't be hard to add, I'm happy to do that, if that's the route
we want to go with this.



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