Add object-rsync-timeout option

Adds the rsync_timeout option to to object-server.conf, so we can adjust
it away from the default of 900s.

If there are a number of large partitions needing replication,
occasionally one needs to adjust the timeout in order to allow the rsync
to complete rather than timeout and retry.

Change-Id: I2d895741cb0528836a675deb6399005a5bf59ab5
Closes-bug: 1702039

config.yaml

@@ -105,6 +105,11 @@ options:
     type: int
     description: |
       Number of replication workers to spawn.
+  object-rsync-timeout:
+    default: 900
+    type: int
+    description: |
+      Max duration of a partition rsync.
   nagios-check-params:
     default: "-m -r 60 180 10 20"
     type: string

lib/swift_storage_context.py

@@ -92,5 +92,6 @@ class SwiftStorageServerContext(OSContextGenerator):
             'object_max_connections': config('object-max-connections'),
             'object_replicator_concurrency': config(
                 'object-replicator-concurrency'),
+            'object_rsync_timeout': config('object-rsync-timeout'),
         }
         return ctxt

templates/object-server.conf

@@ -16,6 +16,7 @@ threads_per_disk = {{ object_server_threads_per_disk }}
 
 [object-replicator]
 concurrency = {{ object_replicator_concurrency }}
+rsync_timeout = {{ object_rsync_timeout }}
 
 [object-updater]
 

unit_tests/test_swift_storage_context.py

@@ -90,6 +90,7 @@ class SwiftStorageContextTests(CharmTestCase):
         self.test_config.set('account-max-connections', '10')
         self.test_config.set('container-max-connections', '10')
         self.test_config.set('object-max-connections', '10')
+        self.test_config.set('object-rsync-timeout', '950')
         ctxt = swift_context.SwiftStorageServerContext()
         result = ctxt()
         ex = {
@@ -102,5 +103,6 @@ class SwiftStorageContextTests(CharmTestCase):
             'account_max_connections': '10',
             'container_max_connections': '10',
             'object_max_connections': '10',
+            'object_rsync_timeout': '950',
         }
         self.assertEqual(ex, result)