120 lines
4.0 KiB
Python
120 lines
4.0 KiB
Python
import hashlib
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import pickle
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from llm_server import opts
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from llm_server.cluster.redis_cycle import add_backend_cycler, redis_cycle
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from llm_server.cluster.stores import redis_running_models
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from llm_server.custom_redis import RedisCustom
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from llm_server.routes.helpers.model import estimate_model_size
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class RedisClusterStore:
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def __init__(self, name: str, **kwargs):
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self.name = name
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self.config_redis = RedisCustom(name, **kwargs)
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def clear(self):
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self.config_redis.flush()
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def load(self, config: dict):
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for k, v in config.items():
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self.add_backend(k, v)
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def add_backend(self, name: str, values: dict):
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self.config_redis.hset(name, mapping={k: pickle.dumps(v) for k, v in values.items()})
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self.set_backend_value(name, 'online', False)
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h = hashlib.sha256(name.encode('utf-8')).hexdigest()
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self.set_backend_value(name, 'hash', f'{h[:8]}-{h[-8:]}')
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def set_backend_value(self, backend: str, key: str, value):
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# By storing the value as a pickle we don't have to cast anything when getting the value from Redis.
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self.config_redis.hset(backend, key, pickle.dumps(value))
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def get_backend(self, name: str):
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r = self.config_redis.hgetall(name)
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output = {}
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for k, v in r.items():
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output[k.decode('utf8')] = pickle.loads(v)
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return output
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def all(self):
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keys = self.config_redis.keys('*')
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if keys:
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result = {}
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for key in keys:
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if key != f'{self.name}:____':
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v = self.get_backend(key)
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result[key] = v
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return result
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else:
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return {}
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def validate_backend(self, backend_url: str):
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"""
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Returns the backend URL that was given, or a new one if that was offline.
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:param backend_url:
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:return:
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"""
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backend_info = self.get_backend(backend_url)
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if not backend_info['online']:
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old = backend_url
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backend_url = get_a_cluster_backend()
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print(f'Backend {old} offline. Request was redirected to {backend_url}')
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return backend_url
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cluster_config = RedisClusterStore('cluster_config')
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def get_backends():
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backends = cluster_config.all()
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result = {}
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for k, v in backends.items():
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b = cluster_config.get_backend(k)
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status = b.get('online', False)
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priority = b['priority']
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result[k] = {'status': status, 'priority': priority}
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if not opts.prioritize_by_size:
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online_backends = sorted(
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((url, info) for url, info in backends.items() if info['online']),
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key=lambda kv: -kv[1]['priority'],
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reverse=True
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)
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else:
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online_backends = sorted(
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((url, info) for url, info in backends.items() if info['online']),
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key=lambda kv: estimate_model_size(kv[1]['model_config']),
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reverse=True
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)
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offline_backends = sorted(
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((url, info) for url, info in backends.items() if not info['online']),
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key=lambda kv: -kv[1]['priority'],
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reverse=True
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)
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return [url for url, info in online_backends], [url for url, info in offline_backends]
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def get_a_cluster_backend(model=None):
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"""
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Get a backend from Redis. If there are no online backends, return None.
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If `model` is not supplied, we will pick one ourself.
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"""
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if model:
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# First, determine if there are multiple backends hosting the same model.
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backends_hosting_model = [i.decode('utf-8') for i in redis_running_models.smembers(model)]
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# If so, create an iterator for those backends
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if len(backends_hosting_model):
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add_backend_cycler(model, backends_hosting_model)
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cycled = redis_cycle(model)
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if len(cycled):
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return cycled[0]
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else:
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# No backend hosting that model
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return None
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else:
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online, _ = get_backends()
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if len(online):
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return online[0]
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