MemcachedError: Memcached error #130 'No Memory' while doing getMeta

Build: 4.0.0-1650

test:
python27 testrunner.py -i /tmp/xdcr.ini -t xdcr.uniXDCR.unidirectional.load_with_async_ops,items=100000,rdirection=unidirection,ctopology=chain,update=C1,delete=C1,sasl_buckets=1,replication_type=xmem

1. C1 [.24,.25] --> C2 [.26,.27]
2. Load 100000 keys on C1
3. Update and delete 30% keys on C1.

Error:
MemcachedError: Memcached error #130 'No Memory': for vbucket :892 to mc 172.23.106.25:11210

which triggered this exception:
[('/usr/local/lib/python2.7/threading.py', 783, '_bootstrap', 'self.bootstrap_inner()'), ('/usr/local/lib/python2.7/threading.py', 810, 'bootstrap_inner', 'self.run()'), ('lib/tasks/task.py', 591, 'run', 'self.next()'), ('lib/tasks/task.py', 1330, 'next', "ignore_meta_data=['expiration'])"), ('lib/tasks/task.py', 1362, '_check_key_revId', 'src_meta_data = self.get_meta_data(self.client_src, key)'), ('lib/tasks/task.py', 1354, '_get_meta_data', 'self.set_exception(error)'), ('lib/tasks/future.py', 264, 'set_exception', 'print traceback.extract_stack()')]