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More explicit follower health checking

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Be more careful about collective member health assessment,
explicitly closing a follower when it has failure and prefacing
collective commands with a check prior to performing the actual
changes.
This commit is contained in:
Jarrod Johnson 2019-11-11 10:49:25 -05:00
parent 0ed7e4eac3
commit 30398fc434
1 changed files with 35 additions and 11 deletions
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46
confluent_server/confluent/config/configmanager.py
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@ -328,6 +328,11 @@ def exec_on_leader(function, *args):
def exec_on_followers(fnname, *args):
pushes = eventlet.GreenPool()
# Check health of collective prior to attempting
for _ in pushes.starmap(
_push_rpc, [(cfgstreams[s], b'') for s in cfgstreams]):
pass
if len(cfgstreams) < (len(_cfgstore['collective']) // 2):
# the leader counts in addition to registered streams
raise exc.DegradedCollective()
@ -386,9 +391,15 @@ def init_masterkey(password=None, autogen=True):
def _push_rpc(stream, payload):
with _rpclock:
stream.sendall(struct.pack('!Q', len(payload)))
if len(payload):
stream.sendall(payload)
try:
stream.sendall(struct.pack('!Q', len(payload)))
if len(payload):
stream.sendall(payload)
return True
except Exception:
logException()
del cfgstreams[stream]
stream.close()
def decrypt_value(cryptvalue,
@ -578,11 +589,18 @@ def relay_slaved_requests(name, listener, vers):
lh = StreamHandler(listener)
_hasquorum = len(cfgstreams) >= (
len(_cfgstore['collective']) // 2)
payload = cPickle.dumps({'quorum': _hasquorum}, protocol=lowestver)
for _ in pushes.starmap(
_push_rpc,
[(cfgstreams[s], payload) for s in cfgstreams]):
pass
_newquorum = None
while _hasquorum != _newquorum:
if _newquorum is not None:
_hasquorum = _newquorum
payload = cPickle.dumps({'quorum': _hasquorum}, protocol=lowestver)
for _ in pushes.starmap(
_push_rpc,
[(cfgstreams[s], payload) for s in cfgstreams]):
pass
_newquorum = len(cfgstreams) >= (
len(_cfgstore['collective']) // 2)
_hasquorum = _newquorum
if _hasquorum and _pending_collective_updates:
apply_pending_collective_updates()
msg = lh.get_next_msg()
@ -604,8 +622,10 @@ def relay_slaved_requests(name, listener, vers):
except Exception as e:
exc = e
if 'xid' in rpc:
_push_rpc(listener, cPickle.dumps({'xid': rpc['xid'],
res = _push_rpc(listener, cPickle.dumps({'xid': rpc['xid'],
'exc': exc}, protocol=vers))
if not res:
break
try:
msg = lh.get_next_msg()
except Exception:
@ -650,7 +670,9 @@ class StreamHandler(object):
if confluent.util.monotonic_time() > self.expiry:
return None
if confluent.util.monotonic_time() > self.keepalive:
_push_rpc(self.sock, b'') # nulls are a keepalive
res = _push_rpc(self.sock, b'') # nulls are a keepalive
if not res:
return None
self.keepalive = confluent.util.monotonic_time() + 20
self.expiry = confluent.util.monotonic_time() + 60
msg = self.sock.recv(8)
@ -767,7 +789,9 @@ def follow_channel(channel, proto=2):
_pendingchangesets[rpc['xid']].send()
if 'quorum' in rpc:
_hasquorum = rpc['quorum']
_push_rpc(channel, b'') # use null as ACK
res = _push_rpc(channel, b'') # use null as ACK
if not res:
break
msg = lh.get_next_msg()
finally:
# mark the connection as broken