def test_leaving(self, client):
"""Create a plugin not in the cluster and try to leave the cluster.
Nothing should be written to etcd."""
e = EtcdSynchronizer(self.plugin, self.watcher_ip)
e.start_thread()
e.leave_cluster()
e._client.write.assert_not_called()
e.terminate()
def test_leaving(self, client):
"""Create a plugin not in the cluster and try to leave the cluster.
Nothing should be written to etcd."""
e = EtcdSynchronizer(self.plugin, self.watcher_ip)
e.start_thread()
e.leave_cluster()
e._client.write.assert_not_called()
e.terminate()
def test_scale_down(self):
# Start with a stable cluster of two nodes
sync1 = EtcdSynchronizer(DummyPlugin(None), '10.0.1.1')
sync2 = EtcdSynchronizer(DummyPlugin(None), '10.0.1.2')
mock_client = sync1._client
mock_client.write("/test", json.dumps({"10.0.1.1": "normal",
"10.0.1.2": "normal"}))
for s in [sync1, sync2]:
s.start_thread()
# Make the second node leave
sync2.leave_cluster()
sync2.thread.join(20)
sync2.terminate()
self.wait_for_all_normal(mock_client, required_number=1)
# Check that it's left and the cluster is stable
end = json.loads(mock_client.read("/test").value)
self.assertEqual(None, end.get("10.0.1.2"))
self.assertEqual("normal", end.get("10.0.1.1"))
sync1.terminate()
def test_failure(self):
# Create synchronisers, using a FailPlugin for one which will crash and
# not complete (simulating a failed node)
sync1 = EtcdSynchronizer(DummyPlugin(None), '10.0.0.1')
sync2 = EtcdSynchronizer(FailPlugin(None), '10.0.0.2')
sync3 = EtcdSynchronizer(DummyPlugin(None), '10.0.0.3')
mock_client = sync1._client
for s in [sync1, sync2, sync3]:
s.start_thread()
# After a few seconds, the scale-up will still not have completed
sleep(3)
end = json.loads(mock_client.read("/test").value)
self.assertNotEqual("normal", end.get("10.0.0.1"))
self.assertNotEqual("normal", end.get("10.0.0.2"))
self.assertNotEqual("normal", end.get("10.0.0.3"))
# Start a synchroniser to take 10.0.0.2's place
sync2.terminate()
error_syncer = EtcdSynchronizer(NullPlugin('/test'),
'10.0.0.2',
force_leave=True)
error_syncer.mark_node_failed()
error_syncer.leave_cluster()
error_syncer.start_thread()
# 10.0.0.2 will be removed from the cluster, and the cluster will
# stabilise
self.wait_for_all_normal(mock_client, required_number=2, tries=50)
end = json.loads(mock_client.read("/test").value)
self.assertEqual("normal", end.get("10.0.0.1"))
self.assertEqual("normal", end.get("10.0.0.3"))
self.assertEqual(None, end.get("10.0.0.2"))
for s in [sync1, sync3, error_syncer]:
s.terminate()
def test_failure(self):
# Create synchronisers, using a FailPlugin for one which will crash and
# not complete (simulating a failed node)
sync1 = EtcdSynchronizer(DummyPlugin(None), '10.0.0.1')
sync2 = EtcdSynchronizer(FailPlugin(None), '10.0.0.2')
sync3 = EtcdSynchronizer(DummyPlugin(None), '10.0.0.3')
mock_client = sync1._client
for s in [sync1, sync2, sync3]:
s.start_thread()
# After a few seconds, the scale-up will still not have completed
sleep(3)
end = json.loads(mock_client.read("/test").value)
self.assertNotEqual("normal", end.get("10.0.0.1"))
self.assertNotEqual("normal", end.get("10.0.0.2"))
self.assertNotEqual("normal", end.get("10.0.0.3"))
# Start a synchroniser to take 10.0.0.2's place
sync2.terminate()
error_syncer = EtcdSynchronizer(NullPlugin('/test'),
'10.0.0.2',
force_leave=True)
error_syncer.mark_node_failed()
error_syncer.leave_cluster()
error_syncer.start_thread()
# 10.0.0.2 will be removed from the cluster, and the cluster will
# stabilise
self.wait_for_all_normal(mock_client, required_number=2, tries=50)
end = json.loads(mock_client.read("/test").value)
self.assertEqual("normal", end.get("10.0.0.1"))
self.assertEqual("normal", end.get("10.0.0.3"))
self.assertEqual(None, end.get("10.0.0.2"))
for s in [sync1, sync3, error_syncer]:
s.terminate()
level=logging.DEBUG)
local_ip = sys.argv[1]
site = sys.argv[2]
node_type = sys.argv[3]
datastore = sys.argv[4]
dead_node_ip = sys.argv[5]
key = make_key(site, node_type, datastore)
logging.info("Using etcd key %s" % (key))
error_syncer = EtcdSynchronizer(NullPlugin(key), dead_node_ip, etcd_ip=local_ip, force_leave=True)
print "Marking node as failed and removing it from the cluster - will take at least 30 seconds"
# Move the dead node into ERROR state to allow in-progress operations to
# complete
error_syncer.mark_node_failed()
# Move the dead node out of the cluster
error_syncer.start_thread()
error_syncer.leave_cluster()
# Wait for it to leave
error_syncer.thread.join()
print "Process complete - %s has left the cluster" % dead_node_ip
c = etcd.Client(local_ip, 4000)
new_state = c.get(key).value
logging.info("New etcd state (after removing %s) is %s" % (dead_node_ip, new_state))
etcd_ip=local_ip,
force_leave=True)
except ImportError:
print "You must run mark_node_failed on a node that has Cassandra installed to remove a node from a Cassandra cluster"
sys.exit(1)
else:
error_syncer = EtcdSynchronizer(NullPlugin(key),
dead_node_ip,
etcd_ip=local_ip,
force_leave=True)
print "Marking node as failed and removing it from the cluster - will take at least 30 seconds"
# Move the dead node into ERROR state to allow in-progress operations to
# complete
error_syncer.mark_node_failed()
# Move the dead node out of the cluster
error_syncer.start_thread()
error_syncer.leave_cluster()
# Wait for it to leave
error_syncer.thread.join()
print "Process complete - %s has left the cluster" % dead_node_ip
c = etcd.Client(local_ip, 4000)
new_state = c.get(key).value
logging.info("New etcd state (after removing %s) is %s" %
(dead_node_ip, new_state))
