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https://issues.apache.org/jira/browse/CASSANDRA-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189147#comment-13189147
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Mck SembWever commented on CASSANDRA-2878:
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(4) would at least leave CFIF in better place before migrating forward to CIF.
> Allow CQL-based map/reduce
> --------------------------
>
> 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
> 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.
> Adding CQL support to m/r will allow using an index more simply than trying
> to cram support for more parameters into the job configuration.
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