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https://issues.apache.org/jira/browse/CASSANDRA-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Strickland updated CASSANDRA-4208:
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Attachment: trunk-4208-v2.txt
I've added a patch to allow support for MultipleOutputs. Hadoop trunk now
contains a new version of MultipleOutputs that should support this out of the
box, although I am submitting a patch to deal with an inconsistency that could
cause future issues with non-file formats.
The basic solution involves changing the config key for output CF to match the
"basename" key being written by MultipleOutputs. I had to make related changes
to CassandraStorage and TestRingCache, as well as some minor changes to
ColumnFamilyInputFormat to account for some interface changes in Hadoop trunk.
So the bottom line is this will work if people use Hadoop and Cassandra trunk
with both patches applied. The original patch can be used as a temporary
solution if needed.
> 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-v2.txt, 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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