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Posted to issues@hbase.apache.org by "Nicolas Liochon (JIRA)" <ji...@apache.org> on 2014/03/03 10:24:20 UTC

[jira] [Updated] (HBASE-10018) Change the location prefetch

     [ https://issues.apache.org/jira/browse/HBASE-10018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicolas Liochon updated HBASE-10018:
------------------------------------

    Status: Open  (was: Patch Available)

> Change the location prefetch
> ----------------------------
>
>                 Key: HBASE-10018
>                 URL: https://issues.apache.org/jira/browse/HBASE-10018
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.96.0, 0.98.0
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
>             Fix For: 0.98.1, 0.99.0
>
>         Attachments: 10018.v1.patch, 10018.v2.patch, 10018v3.patch
>
>
> Issues with prefetching are:
> - we do two calls to meta: one for the exact row, one for the prefetch 
> - it's done in a lock
> - we take the next 10 regions. Why 10, why the 10 next?
> - is it useful if the table has 100K regions?
> Options are:
> - just remove it
> - replace it with a reverse scan: this would save a call
>  



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