Solr/Solrj: How can I determine the total number of documents in an index?

Question

How can I determine the total number of documents in a Solr index using Solrj?

After hours of searching on my own, I actually have an answer (given below); I'm only posting this question so others can find the solution more easily.

Answer 1

Your answer of sending the query *:* is probably the best, most general solution. Especially if you are using SolrCloud. However, there is an alternate solution, the Solr Core Admin API

Answer 2

Pasting the whole curl:

curl -s --negotiate -u: 'hostname:8983/solr/my_collection/query?q=*:*&rows=0' | jq '.response | .numFound'
1868000278

Answer 3

Here's what I use to get total docs using JSON/PHP hope this helps

// Get total number of documents in solr
$solrObj = file_get_contents("http://HOSTNAME:8983/solr/COLLECTION 
NAME/select?q=*:*&rows=0&wt=json");
// var_dump(json_decode($solrObj));
$res_obj = json_decode($solrObj);
$numDocs = $res_obj->response->numFound; 
echo "Total number docs found!: ".$numDocs."<br />";