SolrJ and ContentStreams

[Marcus Paradies <ma...@gmail.com>]

Hi 

I'm considering to use SolrJ to run queries in a MLT fashion against my Solr
server. I saw that there is already an open bug filed in Jira
(https://issues.apache.org/jira/browse/SOLR-1085).

My questions is: 

Is it possible to use content streams to pass a data stream to the MLT
handler in SolrJ?

Ideally I'd like to do something like 

http://localhost:8983/solr/mlt?stream.body=electronics%20memory&mlt.fl=manu,cat&mlt.interestingTerms=list&mlt.mintf=0

in SolrJ. Currently I'm defining most of the MLT specific parameters in the
solrconfig.xml. Is that possible in SolrJ?

Thanks,
Marcus

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Re: SolrJ and ContentStreams

[Marcus Paradies <ma...@gmail.com>]

Thanks Chris!

That was very helpful and solved my problem.

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Re: SolrJ and ContentStreams

[Chris Hostetter <ho...@fucit.org>]

: I'm considering to use SolrJ to run queries in a MLT fashion against my Solr
: server. I saw that there is already an open bug filed in Jira
: (https://issues.apache.org/jira/browse/SOLR-1085).

note that that issue is really just about having convinience classes for 
executing MLT style requests and parsing hte responses.  Just because 
those convinience methods/classes don't exist yet doesn't mean you can't 
use SolrJ to send MLT requests.  You can instantiate a QueryRequest object 
with the SolrParams you want to specify for MLT, and then extract the data 
you want directly from the QueryResponse.

The only potentially tricky part is sending an arbitrary ContentStream.  
in your example you are using the "stream.body" for a short string -- this 
is easy to do as a param when building a QueryRequest object, but if you 
want to provide a much larger stream of data you can subclass 
QueryRequest to add your own ContentStream (from a File Source or 
whatever) to the Collection it will stream to hte server.

For that matter, even though it's name might fool you, i'm pretty sure you 
a "ContentStreamUpdateRequest" instance with the appropriate URL for your 
MLT handler will do exactly what you want.

https://lucene.apache.org/solr/api/org/apache/solr/client/solrj/request/ContentStreamUpdateRequest.html
https://lucene.apache.org/solr/api/org/apache/solr/client/solrj/request/AbstractUpdateRequest.html#setParam%28java.lang.String,%20java.lang.String%29

-Hoss