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Posted to issues@hbase.apache.org by "Nicolas Liochon (JIRA)" <ji...@apache.org> on 2014/02/26 16:02:20 UTC
[jira] [Commented] (HBASE-10018) Change the location prefetch
[ https://issues.apache.org/jira/browse/HBASE-10018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13912990#comment-13912990 ]
Nicolas Liochon commented on HBASE-10018:
-----------------------------------------
v1:
- remove the lock
- does a small reversed scan instead of a getRowSomething and a scan
- deprecates all the prefetch methods, keep the interfaces but the methods do nothing
- when we were doing a locate *without* the cache, we were also removing the entry from the cache. We don't do that anymore.
> Change the location prefetch
> ----------------------------
>
> Key: HBASE-10018
> URL: https://issues.apache.org/jira/browse/HBASE-10018
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.0, 0.96.0
> Reporter: Nicolas Liochon
> Assignee: Nicolas Liochon
> Priority: Minor
> Fix For: 0.98.1, 0.99.0
>
> Attachments: 10018.v1.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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