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https://issues.apache.org/jira/browse/CASSANDRA-5251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590587#comment-13590587
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Jonathan Ellis commented on CASSANDRA-5251:
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If you want to m/r data without random i/o, it needs to be in the same CF,
which may not be ideal for your other uses. Pick your poison.
> 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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