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https://issues.apache.org/jira/browse/CASSANDRA-1124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-1124.
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    Resolution: Not A Problem

bq. run Hadoop JobTrackers on all of the Cassandra nodes

this is the approach we've been going with.

> Improve Cassandra to MapReduce locality sharing
> -----------------------------------------------
>
>                 Key: CASSANDRA-1124
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1124
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: Jeremy Hanna
>            Priority: Minor
>
> Currently, the hadoop integration only passes the data's local node 
> information (ColumnFamilyRecordReader-RowIterator-getLocation).  Hadoop can 
> take advantage of full locality and it's possible that we have full locality 
> configured in Cassandra.
> So this improvement is for adding the full locality of the data into the 
> String in a way that hadoop can make use of it with its Job/Task Trackers.
> This will allow for jobs to be potentially on the same rack and/or datacenter 
> if possible.

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