System Redis

For more advanced usecases and for performance Jumpscale depends on Redis.

Redis is an open source (BSD licensed), in-memory data structure store, used as database, cache and message broker.

Used for what functions?

• Logs and log rotation
• Error conditions
• Statistics and aggregation of statistics
• Queuing work to local worker processes (workers)
• Caching of configuration parameters
• Remembering state of e.g. executors
• ...

How does it get loaded?

• When initiating a j instance, whether by starting a jsshell or importing j from JumpScale, it will be loaded on j.core.db
• First port 9999 will be checked, if available that client will be loaded
• Then default Redis port 6379 will be checked and loaded if found
• Otherwise j.core.db=None