NODE-927 fixes issue where authentication was performed against arbit…

…er instances.

HISTORY.md

@@ -1,3 +1,8 @@
+2.1.8
+----------------
+* NODE-925 ensure we reschedule operations while pool is < poolSize while pool is growing and there are no connnections with not currently performing work.
+* NODE-927 fixes issue where authentication was performed against arbiter instances.
+
 2.1.7 2017-01-24
 ----------------
 * NODE-919 ReplicaSet connection does not close immediately (Issue #156).

lib/topologies/replset.js

@@ -83,7 +83,7 @@ var handlers = ['connect', 'close', 'error', 'timeout', 'parseError'];
  * @param {boolean} [options.promoteValues=true] Promotes BSON values to native types where possible, set to false to only receive wrapper types.
  * @param {boolean} [options.promoteBuffers=false] Promotes Binary BSON values to native Node Buffers.
  * @param {number} [options.pingInterval=5000] Ping interval to check the response time to the different servers
- * @param {number} [options.localThresholdMS=15] Cutoff latency point in MS for MongoS proxy selection
+ * @param {number} [options.localThresholdMS=15] Cutoff latency point in MS for Replicaset member selection
  * @param {boolean} [options.domainsEnabled=false] Enable the wrapping of the callback in the current domain, disabled by default to avoid perf hit.
  * @return {ReplSet} A cursor instance
  * @fires ReplSet#connect
@@ -603,6 +603,11 @@ function applyAuthenticationContexts(self, server, callback) {
     return callback();
   }
 
+  // Do not apply any auth contexts if it's an arbiter
+  if(server.lastIsMaster() && server.lastIsMaster().arbiterOnly) {
+    return callback();
+  }
+
   // Copy contexts to ensure no modificiation in the middle of
   // auth process.
   var authContexts = self.s.authenticationContexts.slice(0);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mongodb-core",
-  "version": "2.1.7",
+  "version": "2.1.8",
   "description": "Core MongoDB driver functionality, no bells and whistles and meant for integration not end applications",
   "main": "index.js",
   "scripts": {