SERVER-12638 repro.js (shorter)

repro_shorter.js

var clusterConfig = { shards : 3,
                      mongos : 3,
                      config : 1 };

var st = new ShardingTest(clusterConfig);
var mongos = st.s;

function createShardedCollections(collName, dbName, mongosHost) {
    var mongos = new Mongo(mongosHost);
    var i = 0;
    assert.commandWorked(mongos.adminCommand({ enableSharding : dbName + "_" + i }));
    assert.commandWorked(mongos.adminCommand({ shardcollection : dbName + "_" + i + "." + "collection",
                                                   key : { _id : "hashed" },
                                                   numInitialChunks : 15 }));
}

function parallelCreateShardedCollections(baseName, nthreads) {
    var i = 0;
    var threads = [];
    for (i = 0; i < nthreads; ++i) {
        var collName = baseName + "_";
        var dbName = baseName + "_" + i;
        threads[i] = new Thread(createShardedCollections, collName, dbName, mongos.host);
    }
    for (i = 0; i < nthreads; ++i) {
        threads[i].start();
    }
    for (i = 0; i < nthreads; ++i) {
        threads[i].join();
    }
    return true;
}

jsTest.log("Disabling balancer");
st.stopBalancer();
// mongos.getDB("config").settings.update({ _id: "balancer" }, { $set : { stopped : true } });

jsTest.log("Creating collections");
parallelCreateShardedCollections("basename", 10);

sleep(900000);
st.stop();