Don't create archiver threadpool on single-replset backups

Author: Tim Vaillancourt

MongoBackup/Backup.py

@@ -34,8 +34,8 @@ def __init__(self, options):
         self.dump_gzip = False
         self.balancer_wait_secs = 300
         self.balancer_sleep = 10
-        self.archiver_threads = None
-        self.resolver_threads = None
+        self.archiver_threads = 1
+        self.resolver_threads = 1
         self.notify_nsca = None
         self.nsca_server = None
         self.nsca_password = None
@@ -164,6 +164,8 @@ def run(self):
         if not self.is_mongos:
             logging.info("Starting backup of %s:%s in replset mode" % (self.host, self.port))
 
+            self.archiver_threads = 1
+
             try:
                 self.mongodumper = Mongodumper(
                     self.host,