java.lang.Object
- org.apache.solr.common.cloud.PerReplicaStatesOps

```
public class PerReplicaStatesOps
extends Object
```
This is a helper class that encapsulates various operations performed on the per-replica states Do not directly manipulate the per replica states as it can become difficult to debug them

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static PerReplicaStatesOps`	`addReplica(String replica, Replica.State state, boolean isLeader, PerReplicaStates rs)`
`static PerReplicaStatesOps`	`deleteReplica(String replica, PerReplicaStates rs)`	Delete a replica entry from per-replica states
`static PerReplicaStatesOps`	`downReplicas(List<String> replicas, PerReplicaStates rs)`	Mark the given replicas as DOWN
`static PerReplicaStatesOps`	`flipLeader(Set<String> allReplicas, String next, PerReplicaStates rs)`	Flip the leader replica to a new one
`static PerReplicaStatesOps`	`flipState(String replica, Replica.State newState, PerReplicaStates rs)`	Change the state of a replica
`List<PerReplicaStates.Operation>`	`get()`
`List<PerReplicaStates.Operation>`	`get(PerReplicaStates rs)`
`PerReplicaStates`	`getPerReplicaStates()`
`static PerReplicaStatesOps`	`modifyCollection(DocCollection coll, boolean enable, PerReplicaStates rs)`	Switch a collection from/to perReplicaState=true
`void`	`persist(String znode, SolrZkClient zkClient)`	This is a persist operation with retry if a write fails due to stale state
`String`	`toString()`
`static PerReplicaStatesOps`	`touchChildren()`	Just creates and deletes a dummy entry so that the `Stat.getCversion()` of state.json is updated

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

Method Detail

persist

public void persist(String znode,
                    SolrZkClient zkClient)
             throws org.apache.zookeeper.KeeperException,
                    InterruptedException

This is a persist operation with retry if a write fails due to stale state

Throws:: org.apache.zookeeper.KeeperException; InterruptedException

getPerReplicaStates

public PerReplicaStates getPerReplicaStates()

flipState

public static PerReplicaStatesOps flipState(String replica,
                                            Replica.State newState,
                                            PerReplicaStates rs)

Change the state of a replica

Parameters:: newState - the new state

modifyCollection

public static PerReplicaStatesOps modifyCollection(DocCollection coll,
                                                   boolean enable,
                                                   PerReplicaStates rs)

Switch a collection from/to perReplicaState=true

flipLeader

public static PerReplicaStatesOps flipLeader(Set<String> allReplicas,
                                             String next,
                                             PerReplicaStates rs)

Flip the leader replica to a new one

Parameters:: allReplicas - allReplicas of the shard; next - next leader

deleteReplica

public static PerReplicaStatesOps deleteReplica(String replica,
                                                PerReplicaStates rs)

Delete a replica entry from per-replica states

Parameters:: replica - name of the replica to be deleted

addReplica

public static PerReplicaStatesOps addReplica(String replica,
                                             Replica.State state,
                                             boolean isLeader,
                                             PerReplicaStates rs)

downReplicas

public static PerReplicaStatesOps downReplicas(List<String> replicas,
                                               PerReplicaStates rs)

Mark the given replicas as DOWN

touchChildren
```
public static PerReplicaStatesOps touchChildren()
```
Just creates and deletes a dummy entry so that the Stat.getCversion() of state.json is updated

get

public List<PerReplicaStates.Operation> get()

get

public List<PerReplicaStates.Operation> get(PerReplicaStates rs)

toString
```
public String toString()
```
Overrides:

toString in class Object

Class PerReplicaStatesOps