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From: "Brandon Williams (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-5251) Hadoop support should be able
 to work with multiple column families
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    [ https://issues.apache.org/jira/browse/CASSANDRA-5251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584682#comment-13584682 ] 

Brandon Williams commented on CASSANDRA-5251:
---------------------------------------------

Can you explain your use case for this?  Writing to multiple CFs isn't a huge problem since all of the IO will still be sequential, but reading from multiple CFs will cause random IO seeking between them so is generally not the best fit.
                
> Hadoop support should be able to work with multiple column families
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-5251
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5251
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>    Affects Versions: 1.1.0, 1.1.11, 1.2.0, 2.0
>            Reporter: Illarion Kovalchuk
>            Priority: Minor
>         Attachments: trunk-5251.txt
>
>
> This patch affects api, so I changed hadoop example in it. The main difference is that now ColumnFamilyInput format generates splits for all input column families, and ColumnFamilyOutputFormat works not with List<Mutation>, but with List<Pair<String,Mutation>>, where Pair.left is for column family name.
> Thank you

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