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Cluster Update Settings API

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Cluster Update Settings API

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The Cluster Update Settings API allows to update cluster wide settings.

Cluster Update Settings Request

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A ClusterUpdateSettingsRequest:

ClusterUpdateSettingsRequest request = new ClusterUpdateSettingsRequest();

Cluster Settings

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At least one setting to be updated must be provided:

request.transientSettings(transientSettings); 
request.persistentSettings(persistentSettings);

	Sets the transient settings to be applied
	Sets the persistent setting to be applied

Providing the Settings

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The settings to be applied can be provided in different ways:

String transientSettingKey =
        RecoverySettings.INDICES_RECOVERY_MAX_BYTES_PER_SEC_SETTING.getKey();
int transientSettingValue = 10;
Settings transientSettings =
        Settings.builder()
        .put(transientSettingKey, transientSettingValue, ByteSizeUnit.BYTES)
        .build(); 

String persistentSettingKey =
        EnableAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ENABLE_SETTING.getKey();
String persistentSettingValue =
        EnableAllocationDecider.Allocation.NONE.name();
Settings persistentSettings =
        Settings.builder()
        .put(persistentSettingKey, persistentSettingValue)
        .build();

	Creates a transient setting as `Settings`
	Creates a persistent setting as `Settings`

Settings.Builder transientSettingsBuilder =
        Settings.builder()
        .put(transientSettingKey, transientSettingValue, ByteSizeUnit.BYTES);
request.transientSettings(transientSettingsBuilder);

Settings provided as Settings.Builder

request.transientSettings(
        "{\"indices.recovery.max_bytes_per_sec\": \"10b\"}"
        , XContentType.JSON);

Settings provided as String

Map<String, Object> map = new HashMap<>();
map.put(transientSettingKey
        , transientSettingValue + ByteSizeUnit.BYTES.getSuffix());
request.transientSettings(map);

Settings provided as a Map

Optional Arguments

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The following arguments can optionally be provided:

request.timeout(TimeValue.timeValueMinutes(2)); 
request.timeout("2m");

	Timeout to wait for the all the nodes to acknowledge the settings were applied as a `TimeValue`
	Timeout to wait for the all the nodes to acknowledge the settings were applied as a `String`

request.masterNodeTimeout(TimeValue.timeValueMinutes(1)); 
request.masterNodeTimeout("1m");

	Timeout to connect to the master node as a `TimeValue`
	Timeout to connect to the master node as a `String`

Synchronous Execution

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ClusterUpdateSettingsResponse response = client.cluster().putSettings(request);

Asynchronous Execution

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The asynchronous execution of a cluster update settings requires both the ClusterUpdateSettingsRequest instance and an ActionListener instance to be passed to the asynchronous method:

client.cluster().putSettingsAsync(request, listener);

The ClusterUpdateSettingsRequest to execute and the ActionListener to use when the execution completes

The asynchronous method does not block and returns immediately. Once it is completed the ActionListener is called back using the onResponse method if the execution successfully completed or using the onFailure method if it failed.

A typical listener for ClusterUpdateSettingsResponse looks like:

ActionListener<ClusterUpdateSettingsResponse> listener =
        new ActionListener<ClusterUpdateSettingsResponse>() {
    @Override
    public void onResponse(ClusterUpdateSettingsResponse response) {
        
    }

    @Override
    public void onFailure(Exception e) {
        
    }
};

	Called when the execution is successfully completed. The response is provided as an argument
	Called in case of a failure. The raised exception is provided as an argument

Cluster Update Settings Response

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The returned ClusterUpdateSettings allows to retrieve information about the executed operation as follows:

boolean acknowledged = response.isAcknowledged(); 
Settings transientSettingsResponse = response.getTransientSettings(); 
Settings persistentSettingsResponse = response.getPersistentSettings();

	Indicates whether all of the nodes have acknowledged the request
	Indicates which transient settings have been applied
	Indicates which persistent settings have been applied

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