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Add support for evicting cache entries based on last access time. (#10205)

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Erik Johnston 2021-07-05 16:32:12 +01:00 • committed by GitHub
parent 10671da05b
commit 7a5873277e
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9 changed files with 483 additions and 93 deletions
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68
synapse/config/cache.py
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@ -116,35 +116,41 @@ class CacheConfig(Config):
#event_cache_size: 10K
caches:
# Controls the global cache factor, which is the default cache factor
# for all caches if a specific factor for that cache is not otherwise
# set.
#
# This can also be set by the "SYNAPSE_CACHE_FACTOR" environment
# variable. Setting by environment variable takes priority over
# setting through the config file.
#
# Defaults to 0.5, which will half the size of all caches.
#
#global_factor: 1.0
# Controls the global cache factor, which is the default cache factor
# for all caches if a specific factor for that cache is not otherwise
# set.
#
# This can also be set by the "SYNAPSE_CACHE_FACTOR" environment
# variable. Setting by environment variable takes priority over
# setting through the config file.
#
# Defaults to 0.5, which will half the size of all caches.
#
#global_factor: 1.0
# A dictionary of cache name to cache factor for that individual
# cache. Overrides the global cache factor for a given cache.
#
# These can also be set through environment variables comprised
# of "SYNAPSE_CACHE_FACTOR_" + the name of the cache in capital
# letters and underscores. Setting by environment variable
# takes priority over setting through the config file.
# Ex. SYNAPSE_CACHE_FACTOR_GET_USERS_WHO_SHARE_ROOM_WITH_USER=2.0
#
# Some caches have '*' and other characters that are not
# alphanumeric or underscores. These caches can be named with or
# without the special characters stripped. For example, to specify
# the cache factor for `*stateGroupCache*` via an environment
# variable would be `SYNAPSE_CACHE_FACTOR_STATEGROUPCACHE=2.0`.
#
per_cache_factors:
#get_users_who_share_room_with_user: 2.0
# A dictionary of cache name to cache factor for that individual
# cache. Overrides the global cache factor for a given cache.
#
# These can also be set through environment variables comprised
# of "SYNAPSE_CACHE_FACTOR_" + the name of the cache in capital
# letters and underscores. Setting by environment variable
# takes priority over setting through the config file.
# Ex. SYNAPSE_CACHE_FACTOR_GET_USERS_WHO_SHARE_ROOM_WITH_USER=2.0
#
# Some caches have '*' and other characters that are not
# alphanumeric or underscores. These caches can be named with or
# without the special characters stripped. For example, to specify
# the cache factor for `*stateGroupCache*` via an environment
# variable would be `SYNAPSE_CACHE_FACTOR_STATEGROUPCACHE=2.0`.
#
per_cache_factors:
#get_users_who_share_room_with_user: 2.0
# Controls how long an entry can be in a cache without having been
# accessed before being evicted. Defaults to None, which means
# entries are never evicted based on time.
#
#expiry_time: 30m
"""
def read_config(self, config, **kwargs):
@ -200,6 +206,12 @@ class CacheConfig(Config):
e.message # noqa: B306, DependencyException.message is a property
)
expiry_time = cache_config.get("expiry_time")
if expiry_time:
self.expiry_time_msec = self.parse_duration(expiry_time)
else:
self.expiry_time_msec = None
# Resize all caches (if necessary) with the new factors we've loaded
self.resize_all_caches()