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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1125) Filter out ColumnFamily rows that aren't part of the query
Date Sat, 02 Jul 2011 18:58:22 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059098#comment-13059098
] 

Jeremy Hanna commented on CASSANDRA-1125:
-----------------------------------------

So does this only include key ranges - that's what it sounds like.  And indexes are out for
now too, it sounds like - e.g. where timebucket = 12345.

> Filter out ColumnFamily rows that aren't part of the query
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-1125
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1125
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Hadoop
>            Reporter: Jeremy Hanna
>            Assignee: Mck SembWever
>            Priority: Minor
>             Fix For: 1.0
>
>         Attachments: 1125-formatted.txt, CASSANDRA-1125.patch
>
>
> Currently, when running a MapReduce job against data in a Cassandra data store, it reads
through all the data for a particular ColumnFamily.  This could be optimized to only read
through those rows that have to do with the query.
> It's a small change but wanted to put it in Jira so that it didn't fall through the cracks.

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