Re: Is it possible to searh Solr with a longer query string?

[Jack Krupansky]

Are you using Tomcat?

See:
http://wiki.apache.org/solr/SolrTomcat#Enabling_Longer_Query_Requests
Enabling Longer Query Requests

If you try to submit too long a GET query to Solr, then Tomcat will reject 
your HTTP request on the grounds that the HTTP header is too large; symptoms 
may include an HTTP 400 Bad Request error or (if you execute the query in a 
web browser) a blank browser window.

If you need to enable longer queries, you can set the maxHttpHeaderSize 
attribute on the HTTP Connector element in your server.xml file. The default 
value is 4K. (See http://tomcat.apache.org/tomcat-5.5-doc/config/http.html)

---

If you're not using Tomcat, your container may have a similar limit.

-- Jack Krupansky

-----Original Message----- 
From: yang, gang
Sent: Tuesday, June 25, 2013 5:47 PM
To: solr-user@lucene.apache.org
Cc: Meng, Fan
Subject: RE: Is it possible to searh Solr with a longer query string?

Hi,

I'm using Solr server to develop a search service, and I encounter a problem 
when trying to input a longer query string:

Here is the code:


StringBuffer stringBuffer = new StringBuffer();

... ...
       try{
           //search Pubmed server( a NCBI server ), it returns a list of 
IDs.
           EFetchPubmedServiceStub service = new EFetchPubmedServiceStub();
           EFetchPubmedServiceStub.EFetchRequest req = new 
EFetchPubmedServiceStub.EFetchRequest();
           req.setWebEnv( WebEnv );
           req.setQuery_key( query_key );
           req.setRetstart( "1110" );

           // return 295 IDs
           req.setRetmax( "295" );
           EFetchPubmedServiceStub.EFetchResult res = service.run_eFetch( 
req );

           //connect returned IDs with " OR " and query my local Solr 
server
           for( int i = 0; i < 
res.getPubmedArticleSet().getPubmedArticleSetChoice().length; i++ ){
               EFetchPubmedServiceStub.PubmedArticleType art = 
res.getPubmedArticleSet().getPubmedArticleSetChoice()
                       [ i ].getPubmedArticle();

               if( i > 0 ){
                   stringBuffer.append( " OR " );
               }
               stringBuffer.append( "( pmid:" + 
art.getMedlineCitation().getPMID().getString() + " )" );
           }

           HttpSolrServer solrServer = new HttpSolrServer( 
"http://127.0.0.1:8087/solr430/medline"; );

           String q = stringBuffer.toString();

           //when input query has more 300 IDs, query will throw 
org.apache.solr.client.solrj.SolrServerException: Server at 
http://127.0.0.1:8087/solr430/medline returned non ok status:400, 
message:Bad Request
           QueryResponse solrRes = solrServer.query( new SolrQuery( q ) );
           long found = solrRes.getResults().getNumFound();
           System.out.println( found );
       }
       catch( Exception e ){
           e.printStackTrace();
       }
... ...

Do you think it's possible to change the query string length limit so that 
Solr can accept more IDs?

Thanks.

-Gary