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From Chris Hostetter <>
Subject Re: Processing solr response....
Date Wed, 05 Sep 2007 00:37:59 GMT
: - Does Solr create its own index or is it a wrapper on lucene index(i et its
: the latter)

"Lucene" in the context of this discussion is a Java Library.  Solr is an 
application written in Java -- Solr uses the Lucene library to create an 

: - If answer to the prev Q is NO,  then how is the SOlr index diff from the
: lucene index.

the index is a Lucene index, which can be read by any application that 
uses the Lucene library -- one caveat to this is that depending on the 
FieldTypes you tell Solr to use, the field values may be encoded in ways 
that other applications will not understand.  several people have used 
Solr to search indexes built by their own custom code, or by nutch (and 
vice versa)

: - IndexReader and IndexWriter will no longer be used in the SOlr programs -
: yes/no ?

Solr provides an HTTP API for indexing and searching data.  your 
application can be written in any language you want, and communicates with 
Solr over HTTP -- it can get the responses back in a variety of formats.

: - some documentation on using remote indexes with SOlr ( also faceted
: searching)

you have to elaborate on what you mean by "remote indexes" ... 

Solr as a "web service" can be as "remote" as you want it to be from your 
clients (as long as your clients can reach it over the network using HTTP) 
but it accesses the underlying index using the filesystem.

If you mean you want Solr to be able to access the unerlying index across 
a network in real time -- that is not suported.  You can however use the 
replication scripts to create you index on one "master" machine and then 
have any number of "slave" machines pull it -- Solr can then begin to 
seamlessly use the new index while it finishs existing requests using the 
old index.


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