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// Tests whether a Replica Set in a mongos cluster can cause versioning problems
jsTestLog("Starting sharded cluster...");
var st = new ShardingTest({shards: 1, mongos: 2, other: {rs: true}});
// Uncomment to stop the balancer, since the balancer usually initializes the shard automatically
// SERVER-4921 is otherwise hard to manifest
// st.stopBalancer()
var mongosA = st.s0;
var mongosB = st.s1;
var shard = st.shard0;
coll = mongosA.getCollection(jsTestName() + ".coll");
// Wait for primary and then initialize shard SERVER-5130
st.rs0.getPrimary();
coll.findOne();
var sadmin = shard.getDB("admin");
assert.throws(function() {
sadmin.runCommand({replSetStepDown: 3000, force: true});
});
st.rs0.getPrimary();
mongosA.getDB("admin").runCommand({setParameter: 1, traceExceptions: true});
try {
// This _almost_ always fails, unless the new primary is already detected. If if fails, it
// should
// mark the master as bad, so mongos will reload the replica set master next request
// TODO: Can we just retry and succeed here?
coll.findOne();
} catch (e) {
print("This error is expected : ");
printjson(e);
}
jsTest.log("Running query which should succeed...");
// This should always succeed without throwing an error
coll.findOne();
mongosA.getDB("admin").runCommand({setParameter: 1, traceExceptions: false});
// now check secondary
assert.throws(function() {
sadmin.runCommand({replSetStepDown: 3000, force: true});
});
// Can't use the mongosB - SERVER-5128
other = new Mongo(mongosA.host);
other.setSlaveOk(true);
other = other.getCollection(jsTestName() + ".coll");
print("eliot: " + tojson(other.findOne()));
st.stop();
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