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https://issues.apache.org/jira/browse/CASSANDRA-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872354#action_12872354
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Jonathan Ellis commented on CASSANDRA-1125:
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another option would be to use the RowPredicate with CASSANDRA-749
> 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: Improvement
> Components: Hadoop
> Reporter: Jeremy Hanna
> Assignee: Jeremy Hanna
> Priority: Minor
> Fix For: 0.7
>
>
> 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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