def test_actor_resource_demand(shutdown_only):
ray.shutdown()
cluster = ray.init(num_cpus=3)
global_state_accessor = GlobalStateAccessor(
cluster["redis_address"], ray.ray_constants.REDIS_DEFAULT_PASSWORD)
global_state_accessor.connect()
@ray.remote(num_cpus=2)
class Actor:
def foo(self):
return "ok"
a = Actor.remote()
ray.get(a.foo.remote())
time.sleep(1)
message = global_state_accessor.get_all_heartbeat()
heartbeat = ray.gcs_utils.HeartbeatBatchTableData.FromString(message)
# The actor is scheduled so there should be no more demands left.
assert len(heartbeat.resource_load_by_shape.resource_demands) == 0
@ray.remote(num_cpus=80)
class Actor2:
pass
actors = []
actors.append(Actor2.remote())
time.sleep(1)
# This actor cannot be scheduled.
message = global_state_accessor.get_all_heartbeat()
heartbeat = ray.gcs_utils.HeartbeatBatchTableData.FromString(message)
assert len(heartbeat.resource_load_by_shape.resource_demands) == 1
assert (heartbeat.resource_load_by_shape.resource_demands[0].shape == {
"CPU": 80.0
})
assert (heartbeat.resource_load_by_shape.resource_demands[0].
num_infeasible_requests_queued == 1)
actors.append(Actor2.remote())
time.sleep(1)
# Two actors cannot be scheduled.
message = global_state_accessor.get_all_heartbeat()
heartbeat = ray.gcs_utils.HeartbeatBatchTableData.FromString(message)
assert len(heartbeat.resource_load_by_shape.resource_demands) == 1
assert (heartbeat.resource_load_by_shape.resource_demands[0].
num_infeasible_requests_queued == 2)
global_state_accessor.disconnect()
class Monitor:
"""A monitor for Ray processes.
The monitor is in charge of cleaning up the tables in the global state
after processes have died. The monitor is currently not responsible for
detecting component failures.
Attributes:
redis: A connection to the Redis server.
primary_subscribe_client: A pubsub client for the Redis server.
This is used to receive notifications about failed components.
"""
def __init__(self, redis_address, autoscaling_config, redis_password=None):
# Initialize the Redis clients.
ray.state.state._initialize_global_state(redis_address,
redis_password=redis_password)
self.redis = ray._private.services.create_redis_client(
redis_address, password=redis_password)
self.global_state_accessor = GlobalStateAccessor(
redis_address, redis_password, False)
self.global_state_accessor.connect()
# Set the redis client and mode so _internal_kv works for autoscaler.
worker = ray.worker.global_worker
worker.redis_client = self.redis
worker.mode = 0
# Setup subscriptions to the primary Redis server and the Redis shards.
self.primary_subscribe_client = self.redis.pubsub(
ignore_subscribe_messages=True)
# Keep a mapping from raylet client ID to IP address to use
# for updating the load metrics.
self.raylet_id_to_ip_map = {}
head_node_ip = redis_address.split(":")[0]
self.load_metrics = LoadMetrics(local_ip=head_node_ip)
if autoscaling_config:
self.autoscaler = StandardAutoscaler(autoscaling_config,
self.load_metrics)
self.autoscaling_config = autoscaling_config
else:
self.autoscaler = None
self.autoscaling_config = None
def __del__(self):
"""Destruct the monitor object."""
# We close the pubsub client to avoid leaking file descriptors.
try:
primary_subscribe_client = self.primary_subscribe_client
except AttributeError:
primary_subscribe_client = None
if primary_subscribe_client is not None:
primary_subscribe_client.close()
if self.global_state_accessor is not None:
self.global_state_accessor.disconnect()
self.global_state_accessor = None
def subscribe(self, channel):
"""Subscribe to the given channel on the primary Redis shard.
Args:
channel (str): The channel to subscribe to.
Raises:
Exception: An exception is raised if the subscription fails.
"""
self.primary_subscribe_client.subscribe(channel)
def update_load_metrics(self):
"""Fetches heartbeat data from GCS and updates load metrics."""
all_heartbeat = self.global_state_accessor.get_all_heartbeat()
heartbeat_batch_data = \
ray.gcs_utils.HeartbeatBatchTableData.FromString(all_heartbeat)
for heartbeat_message in heartbeat_batch_data.batch:
resource_load = dict(heartbeat_message.resource_load)
total_resources = dict(heartbeat_message.resources_total)
available_resources = dict(heartbeat_message.resources_available)
waiting_bundles, infeasible_bundles = parse_resource_demands(
heartbeat_batch_data.resource_load_by_shape)
pending_placement_groups = list(
heartbeat_batch_data.placement_group_load.placement_group_data)
# Update the load metrics for this raylet.
node_id = ray.utils.binary_to_hex(heartbeat_message.node_id)
ip = self.raylet_id_to_ip_map.get(node_id)
if ip:
self.load_metrics.update(ip, total_resources,
available_resources, resource_load,
waiting_bundles, infeasible_bundles,
pending_placement_groups)
else:
logger.warning(
f"Monitor: could not find ip for node {node_id}")
def autoscaler_resource_request_handler(self, _, data):
"""Handle a notification of a resource request for the autoscaler.
This channel and method are only used by the manual
`ray.autoscaler.sdk.request_resources` api.
Args:
channel: unused
data: a resource request as JSON, e.g. {"CPU": 1}
"""
if not self.autoscaler:
return
try:
self.autoscaler.request_resources(json.loads(data))
except Exception:
# We don't want this to kill the monitor.
traceback.print_exc()
def process_messages(self, max_messages=10000):
"""Process all messages ready in the subscription channels.
This reads messages from the subscription channels and calls the
appropriate handlers until there are no messages left.
Args:
max_messages: The maximum number of messages to process before
returning.
"""
subscribe_clients = [self.primary_subscribe_client]
for subscribe_client in subscribe_clients:
for _ in range(max_messages):
message = None
try:
message = subscribe_client.get_message()
except redis.exceptions.ConnectionError:
pass
if message is None:
# Continue on to the next subscribe client.
break
# Parse the message.
channel = message["channel"]
data = message["data"]
if (channel ==
ray.ray_constants.AUTOSCALER_RESOURCE_REQUEST_CHANNEL):
message_handler = self.autoscaler_resource_request_handler
else:
assert False, "This code should be unreachable."
# Call the handler.
message_handler(channel, data)
def update_raylet_map(self, _append_port=False):
"""Updates internal raylet map.
Args:
_append_port (bool): Defaults to False. Appending the port is
useful in testing, as mock clusters have many nodes with
the same IP and cannot be uniquely identified.
"""
all_raylet_nodes = ray.nodes()
self.raylet_id_to_ip_map = {}
for raylet_info in all_raylet_nodes:
node_id = (raylet_info.get("DBClientID") or raylet_info["NodeID"])
ip_address = (raylet_info.get("AuxAddress")
or raylet_info["NodeManagerAddress"]).split(":")[0]
if _append_port:
ip_address += ":" + str(raylet_info["NodeManagerPort"])
self.raylet_id_to_ip_map[node_id] = ip_address
def _run(self):
"""Run the monitor.
This function loops forever, checking for messages about dead database
clients and cleaning up state accordingly.
"""
self.subscribe(ray.ray_constants.AUTOSCALER_RESOURCE_REQUEST_CHANNEL)
# Handle messages from the subscription channels.
while True:
# Process autoscaling actions
if self.autoscaler:
# Only used to update the load metrics for the autoscaler.
self.update_raylet_map()
self.update_load_metrics()
self.autoscaler.update()
# Process a round of messages.
self.process_messages()
# Wait for a autoscaler update interval before processing the next
# round of messages.
time.sleep(AUTOSCALER_UPDATE_INTERVAL_S)
def destroy_autoscaler_workers(self):
"""Cleanup the autoscaler, in case of an exception in the run() method.
We kill the worker nodes, but retain the head node in order to keep
logs around, keeping costs minimal. This monitor process runs on the
head node anyway, so this is more reliable."""
if self.autoscaler is None:
return # Nothing to clean up.
if self.autoscaling_config is None:
# This is a logic error in the program. Can't do anything.
logger.error(
"Monitor: Cleanup failed due to lack of autoscaler config.")
return
logger.info("Monitor: Exception caught. Taking down workers...")
clean = False
while not clean:
try:
teardown_cluster(
config_file=self.autoscaling_config,
yes=True, # Non-interactive.
workers_only=True, # Retain head node for logs.
override_cluster_name=None,
keep_min_workers=True, # Retain minimal amount of workers.
)
clean = True
logger.info("Monitor: Workers taken down.")
except Exception:
logger.error("Monitor: Cleanup exception. Trying again...")
time.sleep(2)
def run(self):
try:
self._run()
except Exception:
logger.exception("Error in monitor loop")
if self.autoscaler:
self.autoscaler.kill_workers()
raise
