ReplicationThrottler (druid-server 29.0.1 API)

java.lang.Object
- org.apache.druid.server.coordinator.loading.ReplicationThrottler

```
public class ReplicationThrottler
extends Object
```
The ReplicationThrottler is used to throttle the number of segment replicas that are assigned to a load queue in a single run. This is achieved by setting the values of the following configs:
- CoordinatorDynamicConfig.getReplicationThrottleLimit() - Maximum number of replicas that can be assigned to a tier in a single run.

Constructor Summary

Constructors
Constructor	Description
`ReplicationThrottler(Map<String,Integer> tierToLoadingReplicaCount, int replicationThrottleLimit)`	Creates a new ReplicationThrottler for use during a single coordinator run.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`incrementAssignedReplicas(String tier)`
`boolean`	`isReplicationThrottledForTier(String tier)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ReplicationThrottler
```
public ReplicationThrottler(Map<String,Integer> tierToLoadingReplicaCount,
                            int replicationThrottleLimit)
```
    Creates a new ReplicationThrottler for use during a single coordinator run. The number of replicas loading on a tier must always be within the current replicationThrottleLimit. Thus, if a tier was already loading k replicas at the start of a coordinator run, it may be assigned only replicationThrottleLimit - k more replicas during the run.
    
    Parameters:
    
    tierToLoadingReplicaCount - Map from tier name to number of replicas already being loaded.
    
    replicationThrottleLimit - Maximum number of replicas that can be assigned to a single tier in the current run.
- Method Detail
  - isReplicationThrottledForTier
```
public boolean isReplicationThrottledForTier(String tier)
```
  - incrementAssignedReplicas
```
public void incrementAssignedReplicas(String tier)
```