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From Tobias Jungen <tobias.jun...@gmail.com>
Subject Re: mapreduce from cassandra to cassandra
Date Tue, 18 May 2010 20:00:31 GMT
Also note that the BMT example in contrib is an example of a hadoop process
writing to Cassandra.

On Tue, May 18, 2010 at 12:52 PM, Stu Hood <stu.hood@rackspace.com> wrote:

> A Cassandra OutputFormat was recently contributed, but I haven't had a
> chance to review it. Any feedback you can give would be awesome:
> https://issues.apache.org/jira/browse/CASSANDRA-1101
>
> Thanks,
> Stu
>
> -----Original Message-----
> From: "Jeff Zhang" <zjffdu@gmail.com>
> Sent: Tuesday, May 18, 2010 4:39am
> To: user@cassandra.apache.org
> Subject: Re: mapreduce from cassandra to cassandra
>
> BTW, maybe we should create an issue on jira for this problem if the
> Cassandra committee think it is necessary.
>
>
>
> On Tue, May 18, 2010 at 5:30 PM, Jeff Zhang <zjffdu@gmail.com> wrote:
> > reuse is not possible, but I think it won't hard for cassandra to
> > implement a ColumnFamilyOutputFormat. In my opinion, the
> > ColumnFamilyOutputFormat should be easier to implement than
> > ColumnFamilyInputFormat, because you don't need to think about split
> > in the implementation of OutputFormat.
> >
> >
> >
> >
> >
> > On Tue, May 18, 2010 at 5:22 PM, Ran Tavory <rantav@gmail.com> wrote:
> >> hbase - yes. But is that reusable for cassandra?
> >>
> >> On Tue, May 18, 2010 at 12:17 PM, Jeff Zhang <zjffdu@gmail.com> wrote:
> >>>
> >>> 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
> >>
> >>
> >
> >
> >
> > --
> > Best Regards
> >
> > Jeff Zhang
> >
>
>
>
> --
> Best Regards
>
> Jeff Zhang
>
>
>

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