mikebridge commented on code in PR #42760:
URL: https://github.com/apache/superset/pull/42760#discussion_r4147988858
##########
superset/charts/schemas.py:
##########
@@ -1806,6 +1807,17 @@ class ChartDataResponseResult(Schema):
required=True,
allow_none=None,
)
+ semantic_cache_status: fields.String = fields.String(
Review Comment:
Good catch—the generated `semantic_cache_status` field is restored in
`5e54caab05`, and regeneration leaves the file unchanged. Local generation and
focused tests pass; the new OpenAPI CI run on this head should confirm the
published artifact.
##########
superset/semantic_layers/cache_coordination.py:
##########
@@ -0,0 +1,207 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Ownership-safe coordination for semantic-cache descriptor mutations."""
+
+import logging
+import math
+from collections.abc import Callable
+from dataclasses import dataclass
+from random import random
+from threading import Event, Thread
+from time import monotonic, sleep
+from typing import Protocol, runtime_checkable
+from uuid import uuid4
+
+from redis.exceptions import RedisError
+
+from superset.semantic_layers.cache_repository import
SemanticCacheCoordinationError
+
+SEMANTIC_CACHE_COORDINATION_FAILURE_METRIC: str = (
+ "semantic_cache.containment.coordination_failure"
+)
+logger: logging.Logger = logging.getLogger(__name__)
+
+
+@runtime_checkable
+class OwnerTokenCoordinationBackend(Protocol):
+ """Atomic lease operations required from a coordination backend."""
+
+ def acquire_owner_token(
+ self,
+ key: str,
+ owner_token: str,
+ lease_seconds: int,
+ ) -> bool: ... # pragma: no cover
+
+ def release_owner_token(
+ self,
+ key: str,
+ owner_token: str,
+ ) -> bool: ... # pragma: no cover
+
+ def refresh_owner_token(
+ self,
+ key: str,
+ owner_token: str,
+ lease_seconds: int,
+ ) -> bool: ... # pragma: no cover
+
+
+@dataclass(frozen=True)
+class SemanticCacheCoordinationSettings:
+ """Validated bounded timing settings for descriptor leases."""
+
+ wait_seconds: float
+ lease_seconds: int
+
+ def __post_init__(self) -> None:
+ if (
+ isinstance(self.wait_seconds, bool)
+ or not isinstance(self.wait_seconds, (int, float))
+ or not math.isfinite(self.wait_seconds)
+ or self.wait_seconds < 0
+ ):
+ raise ValueError(
+ "Coordination wait seconds must be finite and non-negative"
+ )
+ if (
+ isinstance(self.lease_seconds, bool)
+ or not isinstance(self.lease_seconds, int)
+ or self.lease_seconds <= 0
+ ):
+ raise ValueError("Coordination lease seconds must be positive")
+
+
+class SemanticCacheCoordinator:
+ """Run descriptor mutations while holding an owner-token lease."""
+
+ def __init__(
+ self,
+ backend: OwnerTokenCoordinationBackend,
+ settings: SemanticCacheCoordinationSettings,
+ *,
+ clock: Callable[[], float] = monotonic,
+ sleeper: Callable[[float], None] = sleep,
+ token_factory: Callable[[], str] = lambda: uuid4().hex,
+ failure_metric: Callable[[str], None] | None = None,
+ jitter: Callable[[], float] = random,
+ ) -> None:
+ self._backend: OwnerTokenCoordinationBackend = backend
+ self._settings: SemanticCacheCoordinationSettings = settings
+ self._clock: Callable[[], float] = clock
+ self._sleeper: Callable[[float], None] = sleeper
+ self._token_factory: Callable[[], str] = token_factory
+ self._failure_metric: Callable[[str], None] = failure_metric or
(lambda _: None)
+ self._jitter: Callable[[], float] = jitter
+
+ def _failure(self, message: str, cause: RedisError | None = None) -> None:
+ self._record_failure()
+ error: SemanticCacheCoordinationError =
SemanticCacheCoordinationError(message)
+ if cause is None:
+ raise error
+ raise error from cause
+
+ def _record_failure(self) -> None:
+ try:
+ self._failure_metric(SEMANTIC_CACHE_COORDINATION_FAILURE_METRIC)
+ except Exception: # pylint: disable=broad-exception-caught
+ logger.debug("Semantic cache coordination metric failed",
exc_info=True)
+
+ def _run_with_renewal(
+ self,
+ lease_key: str,
+ owner_token: str,
+ operation: Callable[[], None],
+ ) -> bool:
+ renewal_stopped: Event = Event()
+ renewal_failed: Event = Event()
+
+ def renew_lease() -> None:
+ interval: float = self._settings.lease_seconds / 3
+ while not renewal_stopped.wait(interval):
+ try:
+ refreshed: bool = self._backend.refresh_owner_token(
+ lease_key,
+ owner_token,
+ self._settings.lease_seconds,
+ )
+ except RedisError:
+ renewal_failed.set()
+ return
+ if not refreshed:
+ renewal_failed.set()
+ return
+
+ renewal_thread: Thread = Thread(
+ target=renew_lease,
+ name="semantic-cache-lease-renewal",
+ daemon=True,
+ )
+ renewal_thread.start()
+ try:
+ operation()
Review Comment:
Good catch—the nonce fence described in our earlier reply had gone missing
from the branch head; `5e54caab05` restores it. A separate-client takeover
probe fails before and passes after, 374 focused tests pass, and the exact tree
had an independent review. Would it make sense to keep the rollout hold until
live split-store/process-pause and provider-result validation is done? To be
precise, this rejects mismatched pairs as misses; it isn't an atomic
cross-store write guarantee.
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