storage: remove mongodb_replica_set option

This option is not needed as you can pass the option into the MongoDB
URL.

Change-Id: Ic549e7d0da6cdff5babaae58ff0b823122e00fbf

aodh/storage/__init__.py

@@ -34,11 +34,6 @@ OPTS = [
                default=-1,
                help=("Number of seconds that alarm histories are kept "
                      "in the database for (<= 0 means forever).")),
-    cfg.StrOpt('mongodb_replica_set',
-               default=None,
-               help='The name of the replica set which is used to connect to '
-                    'MongoDB database. If it is set, MongoReplicaSetClient '
-                    'will be used instead of MongoClient.'),
     cfg.StrOpt('alarm_connection',
                secret=True,
                default=None,

aodh/storage/impl_mongodb.py

@@ -44,8 +44,7 @@ class Connection(pymongo_base.Connection):
         self.conn = self.CONNECTION_POOL.connect(
             url,
             conf.database.max_retries,
-            conf.database.retry_interval,
-            conf.database.mongodb_replica_set)
+            conf.database.retry_interval)
 
         # Require MongoDB 2.4 to use $setOnInsert
         if self.conn.server_info()['versionArray'] < [2, 4]:

aodh/storage/mongo/utils.py

@@ -59,7 +59,7 @@ class ConnectionPool(object):
     def __init__(self):
         self._pool = {}
 
-    def connect(self, url, max_retries, retry_interval, replica_set=None):
+    def connect(self, url, max_retries, retry_interval):
         connection_options = pymongo.uri_parser.parse_uri(url)
         del connection_options['database']
         del connection_options['username']
@@ -77,9 +77,7 @@ class ConnectionPool(object):
         LOG.info(_('Connecting to %(db)s on %(nodelist)s') % log_data)
         try:
             client = MongoProxy(
-                pymongo.MongoClient(
-                    url, replicaSet=replica_set,
-                ),
+                pymongo.MongoClient(url),
                 max_retries,
                 retry_interval,
             )

doc/source/install/manual.rst

@@ -48,11 +48,12 @@ MongoDB
     [database]
     connection = mongodb://username:password@host:27017/aodh
 
-   If MongoDB is configured in replica set mode, add param in aodh.conf
-   to use MongoReplicaSetClient::
+   If MongoDB is configured in replica set mode, add `?replicaSet=` in your
+   connection URL::
 
     [database]
-    mongodb_replica_set = replica_name
+    connection = mongodb://username:password@host:27017/aodh?replicaSet=foobar
+
 
 SQLalchemy-supported DBs
 ------------------------