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Time external cache response time (#9904)

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Erik Johnston 2021-05-04 15:14:22 +01:00 committed by GitHub
parent b85821aca2
commit e3bc4617fc
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2 changed files with 27 additions and 10 deletions
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1
changelog.d/9904.misc Normal file
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@ -0,0 +1 @@
Time response time for external cache requests.

18
synapse/replication/tcp/external_cache.py
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@ -15,7 +15,7 @@
import logging import logging
from typing import TYPE_CHECKING, Any, Optional from typing import TYPE_CHECKING, Any, Optional
from prometheus_client import Counter from prometheus_client import Counter, Histogram
from synapse.logging.context import make_deferred_yieldable from synapse.logging.context import make_deferred_yieldable
from synapse.util import json_decoder, json_encoder from synapse.util import json_decoder, json_encoder
@ -35,6 +35,20 @@ get_counter = Counter(
labelnames=["cache_name", "hit"], labelnames=["cache_name", "hit"],
) )
response_timer = Histogram(
"synapse_external_cache_response_time_seconds",
"Time taken to get a response from Redis for a cache get/set request",
labelnames=["method"],
buckets=(
0.001,
0.002,
0.005,
0.01,
0.02,
0.05,
),
)
logger = logging.getLogger(__name__) logger = logging.getLogger(__name__)
@ -72,6 +86,7 @@ class ExternalCache:
logger.debug("Caching %s %s: %r", cache_name, key, encoded_value) logger.debug("Caching %s %s: %r", cache_name, key, encoded_value)
with response_timer.labels("set").time():
return await make_deferred_yieldable( return await make_deferred_yieldable(
self._redis_connection.set( self._redis_connection.set(
self._get_redis_key(cache_name, key), self._get_redis_key(cache_name, key),
@ -86,6 +101,7 @@ class ExternalCache:
if self._redis_connection is None: if self._redis_connection is None:
return None return None
with response_timer.labels("get").time():
result = await make_deferred_yieldable( result = await make_deferred_yieldable(
self._redis_connection.get(self._get_redis_key(cache_name, key)) self._redis_connection.get(self._get_redis_key(cache_name, key))
) )