Hi all,

I have one question that I hope you can help me with about the generation of 
snapshots.

On Akka persistence documentation I see the following:

http://doc.akka.io/docs/akka/current/scala/cluster-sharding.html

  # Parameter which determines how the coordinator will be store a state
  # valid values either "persistence" or "ddata"
  # The "ddata" mode is experimental, since it depends on the experimental
  # module akka-distributed-data-experimental.
  state-store-mode = "persistence"

  # The shard saves persistent snapshots after this number of persistent
  # events. Snapshots are used to reduce recovery times.
  snapshot-after = 1000

So after 1000 events the shard generates an snapshot, but later when I list the 
available snapshots I see that they are generated for the config and the 
operational datastores.
-rw-r--r-- 1 root root 136 Feb 24 13:16 
snapshot-datastore-config-0-1487938596578
-rw-r--r-- 1 root root 141 Feb 24 13:17 
snapshot-datastore-operational-0-1487938623019

My question then is, when are config and operational snapshots generated?. Is 
there any other configurable parameter that allows controlling the frequency of 
generation of snapshots apart from the 'snapshot-after' parameter?

Thanks a lot in advance and best regards/
Esther
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