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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2015/03/30 22:50:53 UTC

[jira] [Commented] (HBASE-11811) Use binary search for seeking into a block

    [ https://issues.apache.org/jira/browse/HBASE-11811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387375#comment-14387375 ] 

stack commented on HBASE-11811:
-------------------------------

Patch looks good. Would help case where repeated, random seeks in a small set of hot blocks.  Won't help scans.

We should write the index into the block at write time rather than calculate when reading?

> Use binary search for seeking into a block
> ------------------------------------------
>
>                 Key: HBASE-11811
>                 URL: https://issues.apache.org/jira/browse/HBASE-11811
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>         Attachments: 11811-wip-v2.txt, 11811-wip-v4.txt, block_index-v2.txt
>
>
> Currently upon every seek (including Gets) we need to linearly look through the block from the beginning until we find the Cell we are looking for.
> It should be possible to build a simple cache of offsets of Cells for each block as it is loaded and then use binary search to find the Cell in question.



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