doc: document options supported by the new CMAP connection pool

NODE-2637

Author: mbroadst

lib/mongo_client.js

@@ -146,6 +146,10 @@ const validOptions = require('./operations/connect').validOptions;
  * @param {Number} [options.localThresholdMS=15] **Only applies to the unified topology** The size of the latency window for selecting among multiple suitable servers
  * @param {Number} [options.serverSelectionTimeoutMS=30000] **Only applies to the unified topology** How long to block for server selection before throwing an error
  * @param {Number} [options.heartbeatFrequencyMS=10000] **Only applies to the unified topology** The frequency with which topology updates are scheduled
+ * @param {number} [options.maxPoolSize=10] **Only applies to the unified topology** The maximum number of connections that may be associated with a pool at a given time. This includes in use and available connections.
+ * @param {number} [options.minPoolSize=0] **Only applies to the unified topology** The minimum number of connections that MUST exist at any moment in a single connection pool.
+ * @param {number} [options.maxIdleTimeMS] **Only applies to the unified topology** The maximum amount of time a connection should remain idle in the connection pool before being marked idle. The default is infinity.
+ * @param {number} [options.waitQueueTimeoutMS=0] **Only applies to the unified topology** The maximum amount of time operation execution should wait for a connection to become available. The default is 0 which means there is no limit.
  * @param {AutoEncrypter~AutoEncryptionOptions} [options.autoEncryption] Optionally enable client side auto encryption
  * @param {DriverInfoOptions} [options.driverInfo] Allows a wrapping driver to amend the client metadata generated by the driver to include information about the wrapping driver
  * @param {MongoClient~connectCallback} [callback] The command result callback
@@ -415,6 +419,10 @@ MongoClient.prototype.isConnected = function(options) {
  * @param {Number} [options.localThresholdMS=15] **Only applies to the unified topology** The size of the latency window for selecting among multiple suitable servers
  * @param {Number} [options.serverSelectionTimeoutMS=30000] **Only applies to the unified topology** How long to block for server selection before throwing an error
  * @param {Number} [options.heartbeatFrequencyMS=10000] **Only applies to the unified topology** The frequency with which topology updates are scheduled
+ * @param {number} [options.maxPoolSize=10] **Only applies to the unified topology** The maximum number of connections that may be associated with a pool at a given time. This includes in use and available connections.
+ * @param {number} [options.minPoolSize=0] **Only applies to the unified topology** The minimum number of connections that MUST exist at any moment in a single connection pool.
+ * @param {number} [options.maxIdleTimeMS] **Only applies to the unified topology** The maximum amount of time a connection should remain idle in the connection pool before being marked idle. The default is infinity.
+ * @param {number} [options.waitQueueTimeoutMS=0] **Only applies to the unified topology** The maximum amount of time operation execution should wait for a connection to become available. The default is 0 which means there is no limit.
  * @param {AutoEncrypter~AutoEncryptionOptions} [options.autoEncryption] Optionally enable client side auto encryption
  * @param {DriverInfoOptions} [options.driverInfo] Allows a wrapping driver to amend the client metadata generated by the driver to include information about the wrapping driver
  * @param {MongoClient~connectCallback} [callback] The command result callback

lib/operations/connect.js

@@ -151,6 +151,11 @@ const validOptionNames = [
   'tlsCertificateKeyFilePassword',
   'minHeartbeatFrequencyMS',
   'heartbeatFrequencyMS',
+
+  // CMAP options
+  'maxPoolSize',
+  'minPoolSize',
+  'maxIdleTimeMS',
   'waitQueueTimeoutMS'
 ];
 

lib/topologies/native_topology.js

@@ -15,8 +15,18 @@ class NativeTopology extends Topology {
         cursorFactory: Cursor,
         reconnect: false,
         emitError: typeof options.emitError === 'boolean' ? options.emitError : true,
-        maxPoolSize: typeof options.poolSize === 'number' ? options.poolSize : 5,
-        minPoolSize: typeof options.minSize === 'number' ? options.minSize : 0,
+        maxPoolSize:
+          typeof options.maxPoolSize === 'number'
+            ? options.maxPoolSize
+            : typeof options.poolSize === 'number'
+            ? options.poolSize
+            : 10,
+        minPoolSize:
+          typeof options.minPoolSize === 'number'
+            ? options.minPoolSize
+            : typeof options.minSize === 'number'
+            ? options.minSize
+            : 0,
         monitorCommands:
           typeof options.monitorCommands === 'boolean' ? options.monitorCommands : false
       }