def _get_features_for_entity(
self,
values: List[ByteString],
feature_view: str,
requested_features: List[str],
) -> Tuple[Optional[datetime], Optional[Dict[str, ValueProto]]]:
res_val = dict(zip(requested_features, values))
res_ts = Timestamp()
ts_val = res_val.pop(f"_ts:{feature_view}")
if ts_val:
res_ts.ParseFromString(ts_val)
res = {}
for feature_name, val_bin in res_val.items():
val = ValueProto()
if val_bin:
val.ParseFromString(val_bin)
res[feature_name] = val
if not res:
return None, None
else:
timestamp = datetime.fromtimestamp(res_ts.seconds)
return timestamp, res
def online_read(
self,
config: RepoConfig,
table: Union[FeatureTable, FeatureView],
entity_keys: List[EntityKeyProto],
requested_features: Optional[List[str]] = None,
) -> List[Tuple[Optional[datetime], Optional[Dict[str, ValueProto]]]]:
online_store_config = config.online_store
assert isinstance(online_store_config, RedisOnlineStoreConfig)
client = self._get_client(online_store_config)
feature_view = table.name
project = config.project
result: List[Tuple[Optional[datetime],
Optional[Dict[str, ValueProto]]]] = []
if not requested_features:
requested_features = [f.name for f in table.features]
for entity_key in entity_keys:
redis_key_bin = _redis_key(project, entity_key)
hset_keys = [
_mmh3(f"{feature_view}:{k}") for k in requested_features
]
ts_key = f"_ts:{feature_view}"
hset_keys.append(ts_key)
values = client.hmget(redis_key_bin, hset_keys)
requested_features.append(ts_key)
res_val = dict(zip(requested_features, values))
res_ts = Timestamp()
ts_val = res_val.pop(ts_key)
if ts_val:
res_ts.ParseFromString(ts_val)
res = {}
for feature_name, val_bin in res_val.items():
val = ValueProto()
if val_bin:
val.ParseFromString(val_bin)
res[feature_name] = val
if not res:
result.append((None, None))
else:
timestamp = datetime.fromtimestamp(res_ts.seconds)
result.append((timestamp, res))
return result
def online_write_batch(
self,
config: RepoConfig,
table: FeatureView,
data: List[
Tuple[EntityKeyProto, Dict[str, ValueProto], datetime, Optional[datetime]]
],
progress: Optional[Callable[[int], Any]],
) -> None:
online_store_config = config.online_store
assert isinstance(online_store_config, RedisOnlineStoreConfig)
client = self._get_client(online_store_config)
project = config.project
feature_view = table.name
ts_key = f"_ts:{feature_view}"
keys = []
# redis pipelining optimization: send multiple commands to redis server without waiting for every reply
with client.pipeline() as pipe:
# check if a previous record under the key bin exists
# TODO: investigate if check and set is a better approach rather than pulling all entity ts and then setting
# it may be significantly slower but avoids potential (rare) race conditions
for entity_key, _, _, _ in data:
redis_key_bin = _redis_key(project, entity_key)
keys.append(redis_key_bin)
pipe.hmget(redis_key_bin, ts_key)
prev_event_timestamps = pipe.execute()
# flattening the list of lists. `hmget` does the lookup assuming a list of keys in the key bin
prev_event_timestamps = [i[0] for i in prev_event_timestamps]
for redis_key_bin, prev_event_time, (_, values, timestamp, _) in zip(
keys, prev_event_timestamps, data
):
event_time_seconds = int(utils.make_tzaware(timestamp).timestamp())
# ignore if event_timestamp is before the event features that are currently in the feature store
if prev_event_time:
prev_ts = Timestamp()
prev_ts.ParseFromString(prev_event_time)
if prev_ts.seconds and event_time_seconds <= prev_ts.seconds:
# TODO: somehow signal that it's not overwriting the current record?
if progress:
progress(1)
continue
ts = Timestamp()
ts.seconds = event_time_seconds
entity_hset = dict()
entity_hset[ts_key] = ts.SerializeToString()
for feature_name, val in values.items():
f_key = _mmh3(f"{feature_view}:{feature_name}")
entity_hset[f_key] = val.SerializeToString()
pipe.hset(redis_key_bin, mapping=entity_hset)
# TODO: support expiring the entity / features in Redis
# otherwise entity features remain in redis until cleaned up in separate process
# client.expire redis_key_bin based a ttl setting
results = pipe.execute()
if progress:
progress(len(results))
