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Docs: clarified that you don't need to handle ShardRegion.StartEntity after version v1.5.15 of Akka.NET #7380

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Nov 6, 2024
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Docs: clarified that you don't need to handle ShardRegion.StartEntity after version v1.5.15 of Akka.NET #7380

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3 changes: 3 additions & 0 deletions docs/articles/clustering/cluster-sharding.md
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Expand Up @@ -157,6 +157,9 @@ public sealed class MessageExtractor : HashCodeMessageExtractor
}
```

> ![IMPORTANT]
> Since [Akka.NET v1.5.15](https://github.com/akkadotnet/akka.net/releases/tag/1.5.15) Akka.Cluster.Sharding will now automatically handle `ShardRegion.StartEntity` messages for you and will raise an analyzer warning [`AK2001`](xref:AK2001) if you attempt to handle them in your message extractors.

Using `ShardRegion.StartEntity` implies, that you're able to infer a shard id given an entity id alone. For this reason, in example above we modified a cluster sharding routing logic to make use of `HashCodeMessageExtractor` - in this variant, shard id doesn't have to be provided explicitly, as it will be computed from the hash of entity id itself. Notice a `maxNumberOfShards`, which is the maximum available number of shards allowed for this type of an actor - this value must never change during a single lifetime of a cluster.

### Remember Entities Store
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