Package org.apache.solr.cloud

Class DistributedClusterStateUpdater

java.lang.Object

org.apache.solr.cloud.DistributedClusterStateUpdater

public class DistributedClusterStateUpdater
extends Object

Gives access to distributed cluster state update methods and allows code to inquire whether distributed state update is enabled.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DistributedClusterStateUpdater.MutatingCommand	Naming of enum instances are the mutator object name (e.g.
static class	DistributedClusterStateUpdater.StateChangeRecorder	Class handling the distributed updates of collection's Zookeeper files state.json based on multiple updates applied to a single collection (as is sometimes done by *Cmd classes implementing the Collection API commands).

Constructor Summary

Constructors

Constructor	Description
DistributedClusterStateUpdater(boolean useDistributedStateUpdate)	Builds an instance with the specified behavior regarding distribution of state updates, allowing to know distributed updates are not enabled (parameter useDistributedStateUpdate is false), or when they are (parameter is true), gives access to methods and classes allowing the execution of the updates.

Method Summary

Modifier and Type	Method	Description
DistributedClusterStateUpdater.StateChangeRecorder	createStateChangeRecorder(String collectionName, boolean isCollectionCreation)	Create a new instance of DistributedClusterStateUpdater.StateChangeRecorder for a given collection and a given intention (collection creation vs.
void	doSingleStateUpdate(DistributedClusterStateUpdater.MutatingCommand command, ZkNodeProps message, SolrCloudManager scm, ZkStateReader zkStateReader)	Syntactic sugar to allow a single change to the cluster state to be made in a single call.
void	executeNodeDownStateUpdate(String nodeName, ZkStateReader zkStateReader)
boolean	isDistributedStateUpdate()	When this method returns false the legacy behavior of enqueueing cluster state update messages to Overseer should be used and no other method of this class should be called.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DistributedClusterStateUpdater

public DistributedClusterStateUpdater(boolean useDistributedStateUpdate)

Builds an instance with the specified behavior regarding distribution of state updates, allowing to know distributed updates are not enabled (parameter useDistributedStateUpdate is false), or when they are (parameter is true), gives access to methods and classes allowing the execution of the updates.

Parameters:

useDistributedStateUpdate - when this parameter is false, only method expected to ever be called on this instance is isDistributedStateUpdate(), and it will return false.

Method Detail

createStateChangeRecorder

public DistributedClusterStateUpdater.StateChangeRecorder createStateChangeRecorder(String collectionName,
                                                                                    boolean isCollectionCreation)

Create a new instance of DistributedClusterStateUpdater.StateChangeRecorder for a given collection and a given intention (collection creation vs. operations on an existing collection)

doSingleStateUpdate

public void doSingleStateUpdate(DistributedClusterStateUpdater.MutatingCommand command,
                                ZkNodeProps message,
                                SolrCloudManager scm,
                                ZkStateReader zkStateReader)
                         throws org.apache.zookeeper.KeeperException,
                                InterruptedException

Syntactic sugar to allow a single change to the cluster state to be made in a single call.

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

executeNodeDownStateUpdate

public void executeNodeDownStateUpdate(String nodeName,
                                       ZkStateReader zkStateReader)

isDistributedStateUpdate

public boolean isDistributedStateUpdate()

When this method returns false the legacy behavior of enqueueing cluster state update messages to Overseer should be used and no other method of this class should be called.