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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4208) ColumnFamilyOutputFormat should support writing to multiple column families
Date Wed, 02 May 2012 16:38:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266685#comment-13266685
] 

T Jake Luciani commented on CASSANDRA-4208:
-------------------------------------------

I would think the Hadoop community would go for it since they already do so much to decouple
MR from HDFS.

Let's ping them and see what they think, otherwise we could go with the less portable solution.
                
> ColumnFamilyOutputFormat should support writing to multiple column families
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4208
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4208
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>    Affects Versions: 1.1.0
>            Reporter: Robbie Strickland
>         Attachments: trunk-4208.txt
>
>
> It is not currently possible to output records to more than one column family in a single
reducer.  Considering that writing values to Cassandra often involves multiple column families
(i.e. updating your index when you insert a new value), this seems overly restrictive.  I
am submitting a patch that moves the specification of column family from the job configuration
to the write() call in ColumnFamilyRecordWriter.

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