diff -r 447a6f1e8def -r 78c8e64f3cef cubicweb/sobjects/services.py
--- a/cubicweb/sobjects/services.py	Fri Feb 19 12:35:22 2016 +0100
+++ b/cubicweb/sobjects/services.py	Wed Feb 03 11:12:09 2016 +0100
@@ -1,4 +1,4 @@
-# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2003-2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of CubicWeb.
@@ -27,6 +27,7 @@
 from cubicweb.server import Service
 from cubicweb.predicates import match_user_groups, match_kwargs
 
+
 class StatsService(Service):
     """Return a dictionary containing some statistics about the repository
     resources usage.
@@ -161,14 +162,14 @@
 
 
 class SourceSynchronizationService(Service):
-    """Force synchronization of a datafeed source"""
+    """Force synchronization of a datafeed source. Actual synchronization is done
+    asynchronously, this will simply create and return the entity which will hold the import
+    log.
+    """
     __regid__ = 'source-sync'
     __select__ = Service.__select__ & match_user_groups('managers')
 
     def call(self, source_eid):
-        source_entity = self._cw.entity_from_eid(source_eid)
-        repo = self._cw.repo # Service are repo side only.
-        with repo.internal_cnx() as cnx:
-            source = repo.sources_by_uri[source_entity.name]
-            source.pull_data(cnx)
-
+        source = self._cw.repo.sources_by_eid[source_eid]
+        result = source.pull_data(self._cw, force=True, async=True)
+        return result['import_log_eid']