hi. every body. i'm newbie akka.
i'm sorry but i don't english very well. 

i'm using akka cluster sharding. it's very good and nice performance.

but i've got some problems.

when node was unreachable, it to be down(auto down). 
but coordinator send a message to unreachable node until it's going down.
so cluster lost these messages at this time.

i solve this problem, i'm apply at least once delivery at persistent actor.
this will redelivery while node was unreachable and down.

it's perfect?
cluster don't lost messages, but it's duplicated.
i understand "at least once" mean. 
my code is delivery to shardRegion some message.

deliver(aShardRegion.path, deliveryId => ASomeCommand(someParam, deliveryId, 
someParam))

"deliver" function is send to actorSelection(path) results.
so it  send duplicated messages.

can you understand my english?


summarize
my problem : messages were lost when node status is unreachable(this node 
was down and removed then messages delivery success ).
solution1. how to "delivery" to the node(cluster sharding)?
solution2. how to avoid lost messages when node was unreachable?

i'm need your help.
thank you.

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