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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-1263) Only cache guideposts on physical PTable
Date Tue, 30 Sep 2014 08:54:33 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14152975#comment-14152975
] 

ramkrishna.s.vasudevan commented on PHOENIX-1263:
-------------------------------------------------

For the start and stop row also for now we are not collecting the guide posts just using the
region boundaries. So using them and setting the start and stop row to empty[] is fine as
the region is going to be a full region scan.
Incase we are planning to change the logic in the DefaultIterators to use the guideposts then
if we do it in the preScannerOpen then there is a chance that we will end up doing full  region
scan instead of using the guide posts.

> Only cache guideposts on physical PTable
> ----------------------------------------
>
>                 Key: PHOENIX-1263
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-1263
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: James Taylor
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: Phoenix-1263_1.patch, Phoenix-1263_6.patch
>
>
> Rather than caching the guideposts on all tenant-specific tables, we should cache them
only on the physical table. On the client side, we should also update the cache with the latest
for the base multi-tenant table when we update the cache for a tenant-specific table. Then
when we lookup the guideposts, we should ensure that we're getting them from the physical
table.
> Otherwise, it'll be difficult to keep the guideposts cached on the PTable in sync across
all tenant-specific tables (not to mention using quite a bit of memory).



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