# QueueBalancerBase.OnClusterMembershipChange(HashSet<SiloAddress>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.queuebalancerbase/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.queuebalancerbase/methods/)

```csharp
protected abstract void OnClusterMembershipChange(HashSet<SiloAddress> activeSilos)
```

### Parameters

- `activeSilos` (`HashSet<SiloAddress>`)