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https://issues.apache.org/jira/browse/CASSANDRA-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191472#comment-13191472
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Brandon Williams commented on CASSANDRA-2878:
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+1 on e66fc06 at https://github.com/jbellis/cassandra/tree/2878-rebased
> Allow map/reduce to use server-side query filters
> -------------------------------------------------
>
> Key: CASSANDRA-2878
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2878
> Project: Cassandra
> Issue Type: New Feature
> Components: Hadoop
> Reporter: Mck SembWever
> Assignee: Jonathan Ellis
> Priority: Critical
> Labels: hadoop
> Fix For: 1.1
>
>
> 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.
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