Caching
There are two reasons to use caching. First, to improve performance by
reducing the number of writes to the disk. Second, to share session data
in a clustered deployment. Janssen supports a few different options for
caching, as controlled by the cacheProviderType. Also keep in mind that unless
the sessionIdPersistInCache is set to True, Auth Server will store sessions
in the database.
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In-Memory If you only have one server, you can use RAM as the cache. Watch the memory usage of Auth Server--if it gets too high you may want to switch to another cache mechanism.
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Database A "database cache" is an oxymoron. But in cases where you don't want another component or service, but you need the session replication for a cluster, it may be convenient to persist the "cache" data in the database.
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Couchbase If you are already using Couchbase for persistence, then Janssen Auth Server can use "ephemeral buckets", which exist only in memory, for caching.
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Redis The best choice if you need a cache service for LDAP, RDBMS, or Spanner. Great performance and low cache miss rate. Commercial Redis supports TLS, which is a good option if you need secure communication.
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Memcached Still a good choice, especially if that's what you already run for other applications. We have observed a slightly higher cache miss rate under high load, which is fairly atypical for most login applications.
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Cloud Cache Amazon ElastiCache or Google Memorystore offers both Redis and Memcached managed services. They work fine.
Created: 2022-07-21
