def _handle_anti_entropy_audit_request(state, message, _data):
"""handle a requst to audit a specific collection, not some random one"""
log = logging.getLogger("_handle_anti_entropy_audit_request")
timestamp = create_timestamp()
state_key = (message["collection-id"], timestamp, )
database = AuditResultDatabase(state["central-database-connection"])
row_id = database.start_audit(message["collection-id"], timestamp)
database.close()
state["active-requests"][state_key] = _request_state_tuple(
client_tag=message["client-tag"],
timestamp=timestamp,
timeout=time.time()+_request_timeout,
retry_count=max_retry_count,
replies=dict(),
row_id=row_id,
)
request = {
"message-type" : "consistency-check",
"collection-id" : message["collection-id"],
"timestamp-repr": repr(timestamp),
}
for anti_entropy_client in state["anti-entropy-clients"]:
anti_entropy_client.queue_message_for_send(request)
def run(self, halt_event):
"""pick a collection and start a new consistency check"""
if halt_event.is_set():
self._log.info("halt-event is set: exiting")
return
cutoff_timestamp = \
datetime.datetime.now() - \
datetime.timedelta(days=_audit_cutoff_days)
database = AuditResultDatabase(
self._state["central-database-connection"]
)
ineligible_collection_ids = set(
database.ineligible_collection_ids(cutoff_timestamp)
)
eligible_collection_ids = self._state["collection-ids"] \
- ineligible_collection_ids
self._log.info(
"found %s collections eligible for consistency check" % (
len(eligible_collection_ids),
)
)
eligible_collection_id_list = list(eligible_collection_ids)
while len(eligible_collection_id_list) > 0 \
and len(self._state["active-requests"]) < _max_active_checks:
collection_id = random.choice(eligible_collection_id_list)
eligible_collection_id_list.remove(collection_id)
self._start_consistency_check(self._state, collection_id)
return [(self.run, self.next_run(), )]
def _start_consistency_check(state, collection_id, row_id=None, retry_count=0):
log = logging.getLogger("_start_consistency_check")
timestamp = create_timestamp()
state_key = (collection_id, timestamp, )
database = AuditResultDatabase(state["central-database-connection"])
if row_id is None:
row_id = database.start_audit(collection_id, timestamp)
else:
database.restart_audit(row_id, timestamp)
database.close()
state["active-requests"][state_key] = _request_state_tuple(
client_tag=None,
timestamp=timestamp,
timeout=time.time()+_request_timeout,
retry_count=retry_count,
replies=dict(),
row_id=row_id,
)
request = {
"message-type" : "consistency-check",
"collection-id" : collection_id,
"timestamp-repr": repr(timestamp),
}
for anti_entropy_client in state["anti-entropy-clients"]:
anti_entropy_client.queue_message_for_send(request)
def _handle_consistency_check_reply(state, message, _data):
log = logging.getLogger("_handle_consistency_check_reply")
timestamp = parse_timestamp_repr(message["timestamp-repr"])
state_key = (message["collection-id"], timestamp, )
try:
request_state = state["active-requests"][state_key]
except KeyError:
log.warn("Unknown state_key %s from %s" % (
state_key, message["node-name"]
))
return
if message["node-name"] in request_state.replies:
error_message = "duplicate reply from %s %s" % (
message["node-name"],
state_key,
)
log.error(error_message)
return
if message["result"] != "success":
log.error("%s (%s) %s from %s" % (
state_key,
message["result"],
message["error-message"],
message["node-name"],
))
reply_value = _error_reply
else:
reply_value = (message["count"], message["encoded-md5-digest"], )
request_state.replies[message["node-name"]] = reply_value
# not done yet, wait for more replies
if len(request_state.replies) < len(state["anti-entropy-clients"]):
return
# at this point we should have a reply from every node, so
# we don't want to preserve state anymore
del state["active-requests"][state_key]
database = AuditResultDatabase(state["central-database-connection"])
timestamp = create_timestamp()
# push the results into a dict to see how many unique entries there are
md5_digest_dict = dict()
md5_digest_dict[_error_reply] = list()
for node_name in request_state.replies.keys():
node_reply = request_state.replies[node_name]
if node_reply == _error_reply:
md5_digest_dict[_error_reply].append(node_name)
continue
_count, encoded_md5_digest = node_reply
if not encoded_md5_digest in md5_digest_dict:
md5_digest_dict[encoded_md5_digest] = list()
md5_digest_dict[encoded_md5_digest].append(node_name)
# if this audit was started by an anti-entropy-audit-request message,
# we want to send a reply
if request_state.client_tag is not None:
reply = {
"message-type" : "anti-entropy-audit-reply",
"client-tag" : request_state.client_tag,
"collection-id" : message["collection-id"],
"result" : None,
"error-message" : None,
}
else:
reply = None
error_reply_list = md5_digest_dict.pop(_error_reply)
if reply is not None:
reply["error-reply-nodes"] = error_reply_list
if len(md5_digest_dict) > 1:
log.error("found %s different hashes for (%s)" % (
len(md5_digest_dict),
message["collection-id"],
))
for index, value in enumerate(md5_digest_dict.values()):
log.info(str(value))
if reply is not None:
reply["mistmatch-nodes-%s" % (index+1, )] = value
# ok = no errors and all nodes have the same hash for every collection
if len(error_reply_list) == 0 and len(md5_digest_dict) == 1:
description = "collection %s compares ok" % (
message["collection-id"],
)
log.info(description)
state["event-push-client"].info(
"audit-ok", description, collection_id=message["collection-id"]
)
database.successful_audit(request_state.row_id, timestamp)
if reply is not None:
reply["result"] = "success"
state["resilient-server"].send_reply(reply)
return
# we have error(s), but the non-errors compare ok
if len(error_reply_list) > 0 and len(md5_digest_dict) == 1:
# if we come from anti-entropy-audit-request, don't retry
if reply is not None:
database.audit_error(request_state.row_id, timestamp)
database.close()
description = "There were error replies from %s nodes" % (
len(error_reply_list) ,
)
log.error(description)
state["event-push-client"].error(
"consistency-check-errors-replies",
description,
collection_id=message["collection-id"],
error_reply_nodes=error_reply_list
)
reply["result"] = "error"
reply["error-message"] = description
state["resilient-server"].send_reply(reply)
return
if request_state.retry_count >= max_retry_count:
description = "collection %s %s errors, too many retries" % (
message["collection-id"],
len(error_reply_list)
)
log.error(description)
state["event-push-client"].error(
"audit-errors",
description,
collection_id=message["collection-id"]
)
database.audit_error(request_state.row_id, timestamp)
# TODO: needto do something here
else:
description = "%s Error replies from %s nodes, will retry" % (
message["collection-id"],
len(error_reply_list)
)
log.warn(description)
state["event-push-client"].warn(
"audit-retry",
description,
collection_id=message["collection-id"]
)
state["retry-list"].append(
retry_entry_tuple(
retry_time=retry_time(),
collection_id=message["collection-id"],
row_id=request_state.row_id,
retry_count=request_state.retry_count,
)
)
database.wait_for_retry(request_state.row_id)
database.close()
return
# if we make it here, we have some form of mismatch, possibly mixed with
# errors
description = "%s error replies from %s nodes; hash mismatch(es) = %r" % (
message["collection-id"],
len(error_reply_list),
md5_digest_dict.values()
)
log.error(description)
state["event-push-client"].warn(
"audit-retry",
description,
collection_id=message["collection-id"]
)
# if we come from anti-entropy-audit-request, don't retry
if reply is not None:
database.audit_error(request_state.row_id, timestamp)
database.close()
reply["result"] = "audit-error"
reply["error-message"] = description
state["resilient-server"].send_reply(reply)
return
if request_state.retry_count >= max_retry_count:
log.error("%s too many retries" % (message["collection-id"], ))
database.audit_error(request_state.row_id, timestamp)
# TODO: need to do something here
else:
state["retry-list"].append(
retry_entry_tuple(
retry_time=retry_time(),
collection_id=message["collection-id"],
row_id=request_state.row_id,
retry_count=request_state.retry_count,
)
)
database.wait_for_retry(request_state.row_id)
database.close()
