def notify_hax_stop(self):
LOG.debug('Notifying hax stop')
hax_fid = self.consul_util.get_hax_fid()
hax_endpoint = self.consul_util.get_hax_endpoint()
ids = self._ffi.hax_stop(self._ha_ctx, hax_fid.to_c(),
make_c_str(hax_endpoint))
self.herald.wait_for_all(HaLinkMessagePromise(ids))
def _ha_broadcast(self, notes: List[HaNoteStruct],
broadcast_hax_only: bool) -> List[MessageId]:
message_ids: List[MessageId] = []
nr_notes_to_be_sent = len(notes)
notes_sent = 0
LOG.debug('Broadcasting %d notes', nr_notes_to_be_sent)
while notes:
notes_to_send = notes[0:MAX_MOTR_NVEC_UPDATE_SZ]
notes_to_send_len = len(notes_to_send)
notes_sent += notes_to_send_len
if broadcast_hax_only:
hax_endpoint = self.consul_util.get_hax_endpoint()
message_ids = self._ffi.ha_broadcast_hax_only(
self._ha_ctx, make_array(HaNoteStruct, notes_to_send),
notes_to_send_len, make_c_str(hax_endpoint))
else:
message_ids = self._ffi.ha_broadcast(
self._ha_ctx, make_array(HaNoteStruct, notes_to_send),
notes_to_send_len)
LOG.debug('Broadcast HA state complete, message_ids = %s',
message_ids)
notes = notes[MAX_MOTR_NVEC_UPDATE_SZ:]
assert notes_sent == nr_notes_to_be_sent
return message_ids
def send_entrypoint_request_reply(self, message: EntrypointRequest):
reply_context = message.reply_context
req_id = message.req_id
remote_rpc_endpoint = message.remote_rpc_endpoint
process_fid = message.process_fid
LOG.debug('Processing entrypoint request from remote endpoint'
" '{}', process fid {}".format(remote_rpc_endpoint,
str(process_fid)))
sess = principal_rm = confds = None
try:
util = self.consul_util
sess = util.get_leader_session_no_wait()
principal_rm = util.get_session_node(sess)
confds = util.get_confd_list()
rm_fid = util.get_rm_fid()
except Exception:
LOG.exception('Failed to get the data from Consul.'
' Replying with EAGAIN error code.')
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), EAGAIN, 0,
make_array(FidStruct, []),
make_array(c.c_char_p, []), 0,
Fid(0, 0).to_c(), None)
LOG.debug('Reply sent')
return
rc_quorum = int(len(confds) / 2 + 1)
rm_eps = None
for svc in confds:
if svc.node == principal_rm:
rm_eps = svc.address
break
if not rm_eps:
raise RuntimeError('No RM node found in Consul')
confd_fids = [x.fid.to_c() for x in confds]
confd_eps = [make_c_str(x.address) for x in confds]
LOG.debug('Passing the entrypoint reply to hax.c layer')
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), 0,
len(confds),
make_array(FidStruct, confd_fids),
make_array(c.c_char_p,
confd_eps), rc_quorum,
rm_fid.to_c(), make_c_str(rm_eps))
LOG.debug('Entrypoint request has been replied to')
def start(self, rpc_endpoint: str, process: Fid, ha_service: Fid,
rm_service: Fid):
LOG.debug('Starting m0_halon_interface')
self._process_fid = process
result = self._ffi.start(self._ha_ctx, make_c_str(rpc_endpoint),
process.to_c(), ha_service.to_c(),
rm_service.to_c())
if result:
LOG.error(
'Cannot start Motr API. m0_halon_interface::start'
' returned non-zero code (%s)', result)
raise RuntimeError('Cannot start m0_halon_interface.'
'Please check Motr logs for more details.')
def _process_event_cb(self, fid, chp_event, chp_type, chp_pid):
LOG.info('fid=%s, chp_event=%s', fid, chp_event)
self.planner.add_command(
ProcessEvent(
ConfHaProcess(chp_event=chp_event,
chp_type=chp_type,
chp_pid=chp_pid,
fid=fid)))
if chp_event == m0HaProcessEvent.M0_CONF_HA_PROCESS_STOPPED:
proc_ep = self.consul_util.fid_to_endpoint(fid)
if proc_ep:
self._ffi.hax_link_stopped(self._ha_ctx, make_c_str(proc_ep))
def __init__(self,
ffi: HaxFFI,
queue,
rm_fid: Fid,
herald: DeliveryHerald,
node_uuid: str = ''):
self._ffi = ffi or HaxFFI()
# [KN] Note that node_uuid is currently ignored by the corresponding
# hax.c function
self._ha_ctx = self._ffi.init_motr_api(self, make_c_str(node_uuid))
self.queue = queue
self.rm_fid = rm_fid
self.herald = herald
if not self._ha_ctx:
LOG.error('Cannot initialize Motr API. m0_halon_interface_init'
' returned 0')
raise RuntimeError('Cannot initialize Motr API')
def __init__(self,
ffi: HaxFFI,
planner: WorkPlanner,
herald: DeliveryHerald,
consul_util: ConsulUtil,
node_uuid: str = ''):
self._ffi = ffi or HaxFFI()
# [KN] Note that node_uuid is currently ignored by the corresponding
# hax.c function
self._ha_ctx = self._ffi.init_motr_api(self, make_c_str(node_uuid))
self.planner = planner
self.herald = herald
self.consul_util = consul_util
self.spiel_ready = False
self.is_stopping = False
if not self._ha_ctx:
LOG.error('Cannot initialize Motr API. m0_halon_interface_init'
' returned 0')
raise RuntimeError('Cannot initialize Motr API')
def start(self, rpc_endpoint: str, process: Fid, ha_service: Fid,
profile: Profile):
LOG.debug('Starting m0_halon_interface')
self._process_fid = process
self._profile = profile
@repeat_if_fails()
def _get_rm_fid() -> Fid:
return self.consul_util.get_rm_fid()
rm_fid = _get_rm_fid()
result = self._ffi.start(self._ha_ctx, make_c_str(rpc_endpoint),
process.to_c(), ha_service.to_c(),
rm_fid.to_c())
if result:
LOG.error(
'Cannot start Motr API. m0_halon_interface::start'
' returned non-zero code (%s)', result)
raise RuntimeError('Cannot start m0_halon_interface.'
'Please check Motr logs for more details.')
def send_entrypoint_request_reply(self, message: EntrypointRequest):
reply_context = message.reply_context
req_id = message.req_id
remote_rpc_endpoint = message.remote_rpc_endpoint
process_fid = message.process_fid
e_rc = EAGAIN
LOG.debug('Processing entrypoint request from remote endpoint'
" '{}', process fid {}".format(remote_rpc_endpoint,
str(process_fid)))
sess = principal_rm = confds = None
try:
util = self.consul_util
# When stopping, there's a possibility that hax may receive
# an entrypoint request from motr land. In order to unblock
# motr land, reply with entrypoint request with no confds
# and RM endpoints as the processes might have already
# stopped.
rc_quorum = 0
rm_fid = Fid(0, 0)
if self.is_stopping:
confds = []
else:
sess = util.get_leader_session()
principal_rm = util.get_session_node(sess)
confds = util.get_confd_list()
# Hax may receive entrypoint requests multiple times during its
# lifetime. Hax starts motr rconfc to invoke spiel commands. Motr
# rconfc establishes connection with principal RM, in case of
# principal RM failure, rconfc invalidates its confc and again
# requests entrypoint in a hope that there will be another confd
# and principal RM elected so that rconfc can resume its
# functionality. During shutdown, when each motr process stops,
# including confds, hax broadcasts M0_NC_FAILED event for every
# STOPPED or FAILED motr process. Motr rconfc on receiving the
# failed events for confds, goes re-requests entrypoint information
# and this goes on in a loop. In order to break this loop, the
# the entrypoint reply must only report alive confds and rm
# endpoints. While doing this we need to handle the bootstrapping
# case, so we wait until bootstrapping is done that is all the
# motr services are up, we check the confd status and exclude
# corresponding confd from the entrypoint reply.
# EOS-25726: It seems that the confds were reported as started
# and they failed later. This could be due to a Motr issue
# EOS-25695.
# In such a case, when processes start out of order, a wrong
# quorum value is reported that leads to further issues in Motr
# process startup. Thus commenting this for now. Need to verify
# if this affects hax shutdown.
# active_confds = []
# if self.spiel_ready:
# for confd in confds:
# if not util.is_confd_failed(confd.fid):
# active_confds.append(confd)
# confds = active_confds
if confds:
rm_fid = util.get_rm_fid()
rc_quorum = int(len(confds) / 2 + 1)
rm_eps = None
for svc in confds:
if svc.node == principal_rm:
rm_eps = svc.address
break
if confds and (not self.is_stopping) and (not rm_eps):
if util.m0ds_stopping():
e_rc = 0
raise RuntimeError('No RM node found in Consul')
except Exception:
LOG.exception('Failed to get the data from Consul.'
' Replying with EAGAIN error code, with a 1'
' second delay.')
# If replied EAGAIN, motr immediately sends a subsequent entrypoint
# request and it is observed that several entrypoint requests are
# received by hare in a second. This floods Hare, as an
# intermediate solution, Hare dropped the requests in case of an
# error preparing the same. But, motr does not send any subsequent
# entrypoint requests as expected after a timeout. As per the
# discussion, it is agreed upon to have a temporary fix in Hare.
# https://jts.seagate.com/browse/EOS-27068 motr ticket is created
# to track the same.
sleep(1)
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), e_rc, 0,
make_array(FidStruct, []),
make_array(c.c_char_p, []), 0,
Fid(0, 0).to_c(), None)
LOG.debug('Reply sent')
return
confd_fids = [x.fid.to_c() for x in confds]
confd_eps = [make_c_str(x.address) for x in confds]
LOG.debug('Passing the entrypoint reply to hax.c layer')
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), 0,
len(confds),
make_array(FidStruct, confd_fids),
make_array(c.c_char_p,
confd_eps), rc_quorum,
rm_fid.to_c(), make_c_str(rm_eps))
LOG.debug('Entrypoint request has been replied to')
def send_entrypoint_request_reply(self, message: EntrypointRequest):
reply_context = message.reply_context
req_id = message.req_id
remote_rpc_endpoint = message.remote_rpc_endpoint
process_fid = message.process_fid
e_rc = EAGAIN
LOG.debug('Processing entrypoint request from remote endpoint'
" '{}', process fid {}".format(remote_rpc_endpoint,
str(process_fid)))
sess = principal_rm = confds = None
try:
util = self.consul_util
# When stopping, there's a possibility that hax may receive
# an entrypoint request from motr land. In order to unblock
# motr land, reply with entrypoint request with no confds
# and RM endpoints as the processes might have already
# stopped.
rc_quorum = 0
rm_fid = Fid(0, 0)
if self.is_stopping:
confds = []
else:
sess = util.get_leader_session_no_wait()
principal_rm = util.get_session_node(sess)
confds = util.get_confd_list()
# Hax may receive entrypoint requests multiple times during its
# lifetime. Hax starts motr rconfc to invoke spiel commands. Motr
# rconfc establishes connection with principal RM, in case of
# principal RM failure, rconfc invalidates its confc and again
# requests entrypoint in a hope that there will be another confd
# and principal RM elected so that rconfc can resume its
# functionality. During shutdown, when each motr process stops,
# including confds, hax broadcasts M0_NC_FAILED event for every
# STOPPED or FAILED motr process. Motr rconfc on receiving the
# failed events for confds, goes re-requests entrypoint information
# and this goes on in a loop. In order to break this loop, the
# the entrypoint reply must only report alive confds and rm
# endpoints. While doing this we need to handle the bootstrapping
# case, so we wait until bootstrapping is done that is all the
# motr services are up, we check the confd status and exclude
# corresponding confd from the entrypoint reply.
active_confds = []
if self.spiel_ready:
for confd in confds:
if not util.is_confd_failed(confd.fid):
active_confds.append(confd)
confds = active_confds
if confds:
rm_fid = util.get_rm_fid()
rc_quorum = int(len(confds) / 2 + 1)
rm_eps = None
for svc in confds:
if svc.node == principal_rm:
rm_eps = svc.address
break
if confds and (not self.is_stopping) and (not rm_eps):
if util.m0ds_stopping():
e_rc = 0
raise RuntimeError('No RM node found in Consul')
except Exception:
LOG.exception('Failed to get the data from Consul.'
' Replying with EAGAIN error code.')
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), e_rc, 0,
make_array(FidStruct, []),
make_array(c.c_char_p, []), 0,
Fid(0, 0).to_c(), None)
LOG.debug('Reply sent')
return
confd_fids = [x.fid.to_c() for x in confds]
confd_eps = [make_c_str(x.address) for x in confds]
LOG.debug('Passing the entrypoint reply to hax.c layer')
self._ffi.entrypoint_reply(reply_context, req_id.to_c(), 0,
len(confds),
make_array(FidStruct, confd_fids),
make_array(c.c_char_p,
confd_eps), rc_quorum,
rm_fid.to_c(), make_c_str(rm_eps))
LOG.debug('Entrypoint request has been replied to')
