I’m using cluster sharding without persist actor. (I have only one shardRegion)
I tried to test 2 nodes with 4 shards and It was good as I expected.
But when I run new test with 1000 shards, akka application didn’t work properly.
Why I try to increase number of shard is I need to make scaleable microservice.
Here is log which I got.
level=WARN , loggingId=, logger=ShardRegion, tn=jejudo-akka.actor.default-dispatcher-3, message=Retry request for shard  homes from coordinator at [Actor[akka://email@example.com:2552/system/sharding/DeviceCoordinator/singleton/coordinator#-2030528096]].  buffered messages.,
Why this happened?
What is max number of shard and proper value when I have 100M actors?