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Add metrics tracking for eviction to ResponseCache (#16028)

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Track whether the ResponseCache is evicting due to invalidation
or due to time.
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Jason Little 2023-08-01 07:10:49 -05:00 committed by GitHub
parent a4102d2a5f
commit 7cbb2a00d1
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2 changed files with 9 additions and 2 deletions
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1
changelog.d/16028.misc Normal file
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@ -0,0 +1 @@
Collect additional metrics from `ResponseCache` for eviction.

10
synapse/util/caches/response_cache.py
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@ -36,7 +36,7 @@ from synapse.logging.opentracing import (
) )
from synapse.util import Clock from synapse.util import Clock
from synapse.util.async_helpers import AbstractObservableDeferred, ObservableDeferred from synapse.util.async_helpers import AbstractObservableDeferred, ObservableDeferred
from synapse.util.caches import register_cache from synapse.util.caches import EvictionReason, register_cache
logger = logging.getLogger(__name__) logger = logging.getLogger(__name__)
@ -167,7 +167,7 @@ class ResponseCache(Generic[KV]):
# the should_cache bit, we leave it in the cache for now and schedule # the should_cache bit, we leave it in the cache for now and schedule
# its removal later. # its removal later.
if self.timeout_sec and context.should_cache: if self.timeout_sec and context.should_cache:
self.clock.call_later(self.timeout_sec, self.unset, key) self.clock.call_later(self.timeout_sec, self._entry_timeout, key)
else: else:
# otherwise, remove the result immediately. # otherwise, remove the result immediately.
self.unset(key) self.unset(key)
@ -185,6 +185,12 @@ class ResponseCache(Generic[KV]):
Args: Args:
key: key used to remove the cached value key: key used to remove the cached value
""" """
self._metrics.inc_evictions(EvictionReason.invalidation)
self._result_cache.pop(key, None)
def _entry_timeout(self, key: KV) -> None:
"""For the call_later to remove from the cache"""
self._metrics.inc_evictions(EvictionReason.time)
self._result_cache.pop(key, None) self._result_cache.pop(key, None)
async def wrap( async def wrap(