Hi,

Cluster Sharding uses persistence to ensure that if the shard coordinator
crashes, the current sharding state can be replayed on a new shard
coordinator node (Described in this section of the docs:
http://doc.akka.io/docs/akka/2.4/scala/cluster-sharding.html#How_it_works)

You can configure sharding to use a separate journal by setting akka.cluster
.sharding.journal-plugin-id and akka.cluster.sharding.snapshot-plugin-id.

That configuration entry with a json serializer for PeristentRepr looks
strange, that is an internal plugin API, here's a section in the docs about
providing a human readable format for the journal (I'm guessing that is
what you are after):
http://doc.akka.io/docs/akka/2.4/scala/persistence-schema-evolution.html#Store_events_as_human-readable_data_model

-- 
Akka Team
Lightbend <http://www.lightbend.com/> - Reactive apps on the JVM
Twitter: @akkateam

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