VMware:Config option for http connection pool size

Adding config option 'vmware_connection_pool_size' to specify
the maximum number of connections in the http connection pool.

Change-Id: I4bc2ac61d95c9fc8894503dade6b215c394f0733

cinder/tests/unit/volume/drivers/vmware/test_vmware_vmdk.py

@@ -58,6 +58,7 @@ class VMwareVcVmdkDriverTestCase(test.TestCase):
     VMDK_DRIVER = vmdk.VMwareVcVmdkDriver
     CLUSTERS = ["cls-1", "cls-2"]
     DEFAULT_VC_VERSION = '5.5'
+    POOL_SIZE = 20
 
     VOL_ID = 'abcdefab-cdef-abcd-efab-cdefabcdefab'
     DISPLAY_NAME = 'foo'
@@ -89,6 +90,7 @@ class VMwareVcVmdkDriverTestCase(test.TestCase):
         self._config.vmware_insecure = False
         self._config.vmware_cluster_name = self.CLUSTERS
         self._config.vmware_host_version = self.DEFAULT_VC_VERSION
+        self._config.vmware_connection_pool_size = self.POOL_SIZE
 
         self._db = mock.Mock()
         self._driver = vmdk.VMwareVcVmdkDriver(configuration=self._config,
@@ -2687,17 +2689,19 @@ class VMwareVcVmdkDriverTestCase(test.TestCase):
 
         self._driver.session()
 
+        config = self._driver.configuration
         apiSession.assert_called_once_with(
-            self._config.vmware_host_ip,
+            config.vmware_host_ip,
-            self._config.vmware_host_username,
+            config.vmware_host_username,
-            self._config.vmware_host_password,
+            config.vmware_host_password,
-            self._config.vmware_api_retry_count,
+            config.vmware_api_retry_count,
-            self._config.vmware_task_poll_interval,
+            config.vmware_task_poll_interval,
-            wsdl_loc=self._config.safe_get('vmware_wsdl_location'),
+            wsdl_loc=config.safe_get('vmware_wsdl_location'),
             pbm_wsdl_loc=None,
-            port=self._config.vmware_host_port,
+            port=config.vmware_host_port,
-            cacert=self._config.vmware_ca_file,
+            cacert=config.vmware_ca_file,
-            insecure=self._config.vmware_insecure)
+            insecure=config.vmware_insecure,
+            pool_size=config.vmware_connection_pool_size)
 
     @mock.patch.object(VMDK_DRIVER, 'volumeops')
     @mock.patch.object(VMDK_DRIVER, '_extend_backing')

cinder/volume/drivers/vmware/vmdk.py

@@ -128,6 +128,9 @@ vmdk_opts = [
     cfg.MultiStrOpt('vmware_cluster_name',
                     help='Name of a vCenter compute cluster where volumes '
                          'should be created.'),
+    cfg.IntOpt('vmware_connection_pool_size',
+               default=10,
+               help='Maximum number of connections in http connection pool.'),
 ]
 
 CONF = cfg.CONF
@@ -219,9 +222,10 @@ class VMwareVcVmdkDriver(driver.VolumeDriver):
     # 1.4.0 - support for volume retype
     # 1.5.0 - restrict volume placement to specific vCenter clusters
     # 1.6.0 - support for manage existing
-    VERSION = '1.6.0'
+    # 1.7.0 - new config option 'vmware_connection_pool_size'
+    VERSION = '1.7.0'
 
-    # ThirdaPartySystems wiki page
+    # ThirdPartySystems wiki page
     CI_WIKI_NAME = "VMware_CI"
 
     # Minimum supported vCenter version.
@@ -1814,6 +1818,7 @@ class VMwareVcVmdkDriver(driver.VolumeDriver):
             pbm_wsdl = self.pbm_wsdl if hasattr(self, 'pbm_wsdl') else None
             ca_file = self.configuration.vmware_ca_file
             insecure = self.configuration.vmware_insecure
+            pool_size = self.configuration.vmware_connection_pool_size
             self._session = api.VMwareAPISession(ip, username,
                                                  password, api_retry_count,
                                                  task_poll_interval,
@@ -1821,7 +1826,8 @@ class VMwareVcVmdkDriver(driver.VolumeDriver):
                                                  pbm_wsdl_loc=pbm_wsdl,
                                                  port=port,
                                                  cacert=ca_file,
-                                                 insecure=insecure)
+                                                 insecure=insecure,
+                                                 pool_size=pool_size)
         return self._session
 
     def _get_vc_version(self):

releasenotes/notes/vmdk_config_conn_pool_size-0658c497e118533f.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - Added config option ``vmware_connection_pool_size`` in the
+    VMware VMDK driver to specify the maximum number of connections
+    (to vCenter) in the http connection pool.