Caching options¶
The caching used in the Message service is determined by the following options:
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| memcached_servers = None | (List) Memcached servers or None for in process cache. |
| [cache] | |
| backend = dogpile.cache.null | (String) Dogpile.cache backend module. It is recommended that Memcache with pooling (oslo_cache.memcache_pool) or Redis (dogpile.cache.redis) be used in production deployments. Small workloads (single process) like devstack can use the dogpile.cache.memory backend. |
| backend_argument = [] | (Multi-valued) Arguments supplied to the backend module. Specify this option once per argument to be passed to the dogpile.cache backend. Example format: “<argname>:<value>”. |
| config_prefix = cache.oslo | (String) Prefix for building the configuration dictionary for the cache region. This should not need to be changed unless there is another dogpile.cache region with the same configuration name. |
| debug_cache_backend = False | (Boolean) Extra debugging from the cache backend (cache keys, get/set/delete/etc calls). This is only really useful if you need to see the specific cache-backend get/set/delete calls with the keys/values. Typically this should be left set to false. |
| enabled = False | (Boolean) Global toggle for caching. |
| expiration_time = 600 | (Integer) Default TTL, in seconds, for any cached item in the dogpile.cache region. This applies to any cached method that doesn’t have an explicit cache expiration time defined for it. |
| memcache_dead_retry = 300 | (Integer) Number of seconds memcached server is considered dead before it is tried again. (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| memcache_pool_connection_get_timeout = 10 | (Integer) Number of seconds that an operation will wait to get a memcache client connection. |
| memcache_pool_maxsize = 10 | (Integer) Max total number of open connections to every memcached server. (oslo_cache.memcache_pool backend only). |
| memcache_pool_unused_timeout = 60 | (Integer) Number of seconds a connection to memcached is held unused in the pool before it is closed. (oslo_cache.memcache_pool backend only). |
| memcache_servers = localhost:11211 | (List) Memcache servers in the format of “host:port”. (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| memcache_socket_timeout = 3 | (Integer) Timeout in seconds for every call to a server. (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| proxies = | (List) Proxy classes to import that will affect the way the dogpile.cache backend functions. See the dogpile.cache documentation on changing-backend-behavior. |
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