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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5514) Allow timestamp hints
Date Thu, 23 May 2013 21:33:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665696#comment-13665696
] 

Jonathan Ellis commented on CASSANDRA-5514:
-------------------------------------------

LGTM in principle.  Made some tweaks in https://github.com/jbellis/cassandra/commits/5514.
 Still a bit unclear about DCT -- added a hack in the last commit to always return true, but
do we need to do anything on the collector side?
                
> Allow timestamp hints
> ---------------------
>
>                 Key: CASSANDRA-5514
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5514
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>             Fix For: 2.0
>
>         Attachments: 0001-CASSANDRA-5514-v1.patch, 0001-CASSANDRA-5514-v2.patch
>
>
> Slice queries can't optimize based on timestamp except for rare cases (CASSANDRA-4116).
 However, many common queries involve an implicit time component, where the application author
knows that he is only interested in data more recent than X, or older than Y.
> We could use the per-sstable max and min timestamps we track to avoid touching cold data
if we could pass a hint to Cassandra about the time range we care about.

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