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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2011/02/25 02:08:38 UTC

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-2245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999169#comment-12999169 ] 

Brandon Williams commented on CASSANDRA-2245:
---------------------------------------------

An easy way to solve this is CASSANDRA-1600, but we held off on it for 0.7 because we didn't want to break the thrift API.

> 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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