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From Grant Ingersoll <>
Subject Re: getting mahout clustering info back into lucene
Date Sat, 05 Nov 2011 14:06:07 GMT

On Nov 5, 2011, at 8:36 AM, Robert Stewart wrote:

> If I run mahout clustering on lucene vectors, how would I go about getting that cluster
information back into lucene, in order to use the cluster identifiers in field collapsing?

Since Lucene doesn't have incremental field update (which is seriously non-trivial to do in
an inverted index), the only way to do this is to re-index.  Once DocValues are updateable,
this may be a lot easier.   You could, also, perhaps use the ParallelReader, but that has
some restrictions (you have to keep docids in sync)

> I know I can re-index with the new cluster info, but is there any way to put cluster
info into an existing index (which also may be non-optimized and quite large)?  One way maybe
to have a custom field collapsing component that can read mahout cluster output.  Any thoughts?

Solr has some plugins around clustering already, if you are using that.  I've done some prototyping
on hooking in Mahout, but there is nothing official yet.  I haven't looked at field collapsing
in depth yet.

On trunk, you might be able to do some other fancy tricks to make this work via codecs.

Grant Ingersoll

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