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From "Mattmann, Chris A (388J)" <>
Subject Re: [VOTE] merge lucene/solr development (take 3)
Date Tue, 09 Mar 2010 14:58:07 GMT
Hi Dennis,

> It was late when I wrote that, maybe my analogy was not clear.  You are
> echoing what I was trying to say that that Hadoop != Nutch and it
> wouldn't have been as useful if it had only ever been viewed that way.
> I think part of this discussion is looking at Lucene as needing things
> that are beyond it.  That should be other projects.
> Here is my logic FWIW:
> Solr depends on Lucene.
> Many other projects depend critically on Lucene
> Not all of those projects depend on Solr
> Solr and Lucene have different responsibilities
> Therefore Solr != Lucene and should not merge dev.
> Should Solr work more closely to move some of it pieces into Lucene if
> they are applicable.  Yes.  To me that doesn't mean merge.

+1, my sentiments exactly.


> Dennis
> Ted Dunning wrote:
>> This logic escapes me.
>> Nutch hatched Hadoop.  Hadoop was perceived to be of much broader utility
>> than just for nutch so it was made more general and a separate project was
>> formed.  Hadoop does not depend on Nutch.
>> Lucene existed.  Solr was built to make it easier to use Lucene.  The
>> developers of Solr built a bunch of stuff that was specific to server-ness
>> and a bunch of stuff that would have general utility to many Lucene
>> developers.  Solr depends critically on Lucene and can be seen as a Lucene
>> wrapper.
>> How does this analogy fit together?  Is it supposed to be Hadoop is to Nutch
>> as Solr is to Lucene?  That seems so clearly wrong it can't be what you were
>> saying.
>> On Mon, Mar 8, 2010 at 10:10 PM, Dennis Kubes <> wrote:
>>>> 3) For new Lucene features, there would be an effort to integrate it
>>>> into Solr.
>>> No.  Because by specializing towards Solr, or Nutch, or any of the hundred
>>> other applications that use Lucene, it looses its general applicability.
>>>  Where would Hadoop be if it never made it past Nutch?

Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA

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