[jira] Commented: (CASSANDRA-2245) Enable map reduce to use indexes for ColumnFamilyInputFormat

["Jesse Shieh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001779#comment-13001779 ] 

Jesse Shieh commented on CASSANDRA-2245:
----------------------------------------

+1 for this feature.  We have an index on a date column and want to be able to run a mapreduce just on the previous days data.  This would be very helpful for that use case.

> Enable map reduce to use indexes for ColumnFamilyInputFormat
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-2245
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2245
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>    Affects Versions: 0.7.2
>         Environment: Cassandra 0.7 or later and Hadoop 0.20.1 or later
>            Reporter: Matt Kennedy
>            Priority: Minor
>              Labels: hadoop
>             Fix For: 0.8
>
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> Enable the ability to run a MapReduce job that takes a value in an indexed column as a parameter, and use that to select the data that the MapReduce job operates on.  Right now, it looks like this isn't possible because org.apache.cassandra.hadoop.ColumnFamilyRecordReader will only fetch data with get_range_slices, not get_indexed_slices.

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