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Posted to issues@hbase.apache.org by "Anoop Sam John (JIRA)" <ji...@apache.org> on 2013/03/23 17:05:15 UTC

[jira] [Comment Edited] (HBASE-8188) Avoid unnecessary row compare in StoreScanner

    [ https://issues.apache.org/jira/browse/HBASE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611748#comment-13611748 ] 

Anoop Sam John edited comment on HBASE-8188 at 3/23/13 4:04 PM:
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JM - when batching is not used in Scan (Scan#setBatch(int)), limit will come into StoreScanner as -1.
                
      was (Author: anoopsamjohn):
    JM - when batching is not used in Scan limit will come into StoreScanner as -1.
                  
> Avoid unnecessary row compare in StoreScanner
> ---------------------------------------------
>
>                 Key: HBASE-8188
>                 URL: https://issues.apache.org/jira/browse/HBASE-8188
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: 8188-0.94.txt, 8188-0.96.txt, 8188-0.96.txt
>
>
> When scanner batching disable (which is the default) a row compare in StoreScanner avoided, because only entire rows of data are requested.
> This provides a slight performance gain, especially for tall tables (and when all data is in the cache)

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