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From Jeff Zhang <zjf...@gmail.com>
Subject Re: mapreduce from cassandra to cassandra
Date Tue, 18 May 2010 09:17:06 GMT
I believe it is possible to write result back to cassandra. If I
remember correctly, HBase has both InputFormat and OutputFormat for
hadoop.




On Tue, May 18, 2010 at 5:08 PM, Ran Tavory <rantav@gmail.com> wrote:
> In the wordcount example the process reads from cassandra and the result is
> written to a local file at /tmp/word_count*
> Is it possible to read from cassandra and write the result back to cassandra
> to a specified cf/row/column?
> I see that there exists a ColumnFamilyInputFormat but not
> ColumnFamilyOutputFormat or something like that
> (in http://svn.apache.org/repos/asf/cassandra/trunk/src/java/org/apache/cassandra/hadoop/)
> My knowledge about hadoop and mr is pretty basic so maybe I'm missing
> something simple, lmk, thanks!



-- 
Best Regards

Jeff Zhang

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