# Example: Lettuce config for cluster mode, TLS enabled
<a name="BestPractices.Clients-lettuce-cme"></a>

**Note**  
Timeouts in the following example are for tests that ran SET/GET commands with keys and values up to 20 bytes long. The processing time can be longer when the commands are complex or the keys and values are larger. You should set the timeouts based on the use case of your application. 

```
// Set DNS cache TTL
public void setJVMProperties() {
    java.security.Security.setProperty("networkaddress.cache.ttl", "10");
}

private static final Duration META_COMMAND_TIMEOUT = Duration.ofMillis(1000);
private static final Duration DEFAULT_COMMAND_TIMEOUT = Duration.ofMillis(250);
// Socket connect timeout should be lower than command timeout for Lettuce
private static final Duration CONNECT_TIMEOUT = Duration.ofMillis(100);

// Create RedisURI from the cluster configuration endpoint
clusterConfigurationEndpoint = <cluster-configuration-endpoint> // TODO: add your cluster configuration endpoint
final RedisURI redisUriCluster =
    RedisURI.Builder.redis(clusterConfigurationEndpoint)
        .withPort(6379)
        .withSsl(true)
        .build();

// Configure the client's resources                
ClientResources clientResources = DefaultClientResources.builder()
    .reconnectDelay(
        Delay.fullJitter(
            Duration.ofMillis(100),     // minimum 100 millisecond delay
            Duration.ofSeconds(10),      // maximum 10 second delay
            100, TimeUnit.MILLISECONDS)) // 100 millisecond base
    .addressResolverGroup(new DirContextDnsResolver())
    .build(); 

// Create a cluster client instance with the URI and resources
RedisClusterClient redisClusterClient = 
    RedisClusterClient.create(clientResources, redisUriCluster);

// Use a dynamic timeout for commands, to avoid timeouts during
// cluster management and slow operations.
class DynamicClusterTimeout extends TimeoutSource {
     private static final Set<ProtocolKeyword> META_COMMAND_TYPES = ImmutableSet.<ProtocolKeyword>builder()
          .add(CommandType.FLUSHDB)
          .add(CommandType.FLUSHALL)
          .add(CommandType.CLUSTER)
          .add(CommandType.INFO)
          .add(CommandType.KEYS)
          .build();

    private final Duration metaCommandTimeout;
    private final Duration defaultCommandTimeout;

    DynamicClusterTimeout(Duration defaultTimeout, Duration metaTimeout)
    {
        defaultCommandTimeout = defaultTimeout;
        metaCommandTimeout = metaTimeout;
    }

    @Override
    public long getTimeout(RedisCommand<?, ?, ?> command) {
        if (META_COMMAND_TYPES.contains(command.getType())) {
            return metaCommandTimeout.toMillis();
        }
        return defaultCommandTimeout.toMillis();
    }
}

TimeoutOptions timeoutOptions = TimeoutOptions.builder()
    .timeoutSource(new DynamicClusterTimeout(DEFAULT_COMMAND_TIMEOUT, META_COMMAND_TIMEOUT))
     .build();

// Configure the topology refreshment options
final ClusterTopologyRefreshOptions topologyOptions = 
    ClusterTopologyRefreshOptions.builder()
    .enableAllAdaptiveRefreshTriggers()
    .enablePeriodicRefresh()
    .dynamicRefreshSources(true)
    .build();

// Configure the socket options
final SocketOptions socketOptions = 
    SocketOptions.builder()
    .connectTimeout(CONNECT_TIMEOUT) 
    .keepAlive(true)
    .build();

// Configure the client's options
final ClusterClientOptions clusterClientOptions = 
    ClusterClientOptions.builder()
    .topologyRefreshOptions(topologyOptions)
    .socketOptions(socketOptions)
    .autoReconnect(true)
    .timeoutOptions(timeoutOptions) 
    .nodeFilter(it -> 
        ! (it.is(RedisClusterNode.NodeFlag.FAIL) 
        || it.is(RedisClusterNode.NodeFlag.EVENTUAL_FAIL) 
        || it.is(RedisClusterNode.NodeFlag.NOADDR))) 
    .validateClusterNodeMembership(false)
    .build();
    
redisClusterClient.setOptions(clusterClientOptions);

// Get a connection
final StatefulRedisClusterConnection<String, String> connection = 
    redisClusterClient.connect();

// Get cluster sync/async commands   
RedisAdvancedClusterCommands<String, String> sync = connection.sync();
RedisAdvancedClusterAsyncCommands<String, String> async = connection.async();
```