Re: Parallel queries to Solr

[Shawn Heisey]

On 2/27/2014 11:32 AM, solr2020 wrote:
We are using DefaultHttpClient 4.2 .3  on solrj side to send parallel
queries to Solr. But the connection manager associated with this
(PoolingHttpClientConnectionManager) by default allows 2 concurrent
connections only.How to send more than 2 parallel queries/how to establish
more than 2 connections?.

First, if you just create SolrJ server objects without specifying the 
HttpClient, they will by default allow a LOT more connections than 
that.  I don't have the numbers handy, but it is a lot more than two.

Here's how you can create objects (either HttpSolrServer or 
CloudSolrServer) that allow even more connections:

        ModifiableSolrParams params = new ModifiableSolrParams();
params.add(HttpClientUtil.PROP_MAX_CONNECTIONS_PER_HOST, "300");
        params.add(HttpClientUtil.PROP_MAX_CONNECTIONS, "5000");
        HttpClient httpClient = HttpClientUtil.createClient(params);

        String myUrl = "http://localhost:8983/solr/collection1";;
        SolrServer hServer = new HttpSolrServer(myUrl, httpClient);

        String zkHost = "zoo1:2181,zoo2:2181,zoo3:2181/mysolr";
        LBHttpSolrServer lbServer = new LBHttpSolrServer(httpClient);
        SolrServer cServer = new CloudSolrServer(zkHost, lbServer);

Thanks,
Shawn