def RebalanceCommit(self):
"""Tell servers to commit rebalance changes."""
# Save rebalance information to a file, so we can recover later.
rebalance.SaveCommitInformation(self.rebalance)
body = self.rebalance.SerializeToString()
size = len(body)
headers = {"Content-Length": size}
for i, pool in enumerate(self.rebalance_pool):
try:
res = pool.urlopen("POST", "/rebalance/perform", headers=headers,
body=body)
if res.status != constants.RESPONSE_OK:
logging.error("Server %d failed to perform transaction %s", i,
self.rebalance.id)
self.CancelRebalancing()
return None
stat = rdf_data_server.DataServerState()
stat.ParseFromString(res.data)
data_server = self.servers[i]
data_server.UpdateState(stat)
except urllib3.exceptions.MaxRetryError:
self.CancelRebalancing()
return None
# Update server intervals.
mapping = self.rebalance.mapping
for i, serv in enumerate(list(self.mapping.servers)):
serv.interval = mapping.servers[i].interval
self.rebalance.mapping = self.mapping
self.service.SaveServerMapping(self.mapping)
# We can finally delete the temporary file, since we have succeeded.
rebalance.DeleteCommitInformation(self.rebalance)
rebalance.RemoveDirectory(self.rebalance)
self.CancelRebalancing()
return self.mapping
def SyncMapping(self, skip=None):
"""Syncs mapping with other servers."""
pools = []
try:
# Update my state.
self._PeriodicThread()
for serv in self.servers[1:]:
if skip and serv in skip:
continue
pool = connectionpool.HTTPConnectionPool(serv.Address(),
port=serv.Port())
pools.append((serv, pool))
body = self.mapping.SerializeToString()
headers = {"Content-Length": len(body)}
for serv, pool in pools:
res = pool.urlopen("POST", "/servers/sync", headers=headers,
body=body)
if res.status != constants.RESPONSE_OK:
logging.warning("Could not sync with server %s:%d", serv.Address(),
serv.Port())
return False
state = rdf_data_server.DataServerState()
state.ParseFromString(res.data)
serv.UpdateState(state)
except urllib3.exceptions.MaxRetryError:
return False
finally:
for _, pool in pools:
pool.close()
return True
def GetStatistics(cls):
"""Build statistics object for the server."""
ok = rdf_data_server.DataServerState.Status.AVAILABLE
num_components, avg_component = cls.SERVICE.GetComponentInformation()
stat = rdf_data_server.DataServerState(size=cls.SERVICE.Size(),
load=0,
status=ok,
num_components=num_components,
avg_component=avg_component)
return stat
def __init__(self, location, index):
# Parse location.
loc = urlparse.urlparse(location, scheme="http")
offline = rdf_data_server.DataServerState.Status.OFFLINE
state = rdf_data_server.DataServerState(size=0, load=0, status=offline)
self.server_info = rdf_data_server.DataServerInformation(
index=index, address=loc.hostname, port=loc.port, state=state)
self.registered = False
self.removed = False
logging.info("Configured DataServer on %s:%d", self.Address(), self.Port())
def _PeriodicThread(self):
"""Periodically update our state and store the mappings."""
ok = rdf_data_server.DataServerState.Status.AVAILABLE
num_components, avg_component = self.service.GetComponentInformation()
state = rdf_data_server.DataServerState(size=self.service.Size(),
load=0,
status=ok,
num_components=num_components,
avg_component=avg_component)
self.myself.UpdateState(state)
self.service.SaveServerMapping(self.mapping)
def HandleState(self):
"""Respond to /server/state."""
if not self.MASTER:
self._EmptyResponse(constants.RESPONSE_NOT_MASTER_SERVER)
return
if not self.data_server:
logging.error("Server %s attempting to update its state but "
"is not registered yet", self.client_address)
self._EmptyResponse(constants.RESPONSE_SERVER_NOT_REGISTERED)
return
state = rdf_data_server.DataServerState(self.post_data)
self.data_server.UpdateState(state)
logging.info("Received new state from server %s", self.client_address)
# Response with our mapping.
body = self.MAPPING.SerializeToString()
self._Response(constants.RESPONSE_OK, body)
