Package org.apache.flink.runtime.taskmanager

Class TaskManagerLocation.DefaultHostNameSupplier

java.lang.Object

org.apache.flink.runtime.taskmanager.TaskManagerLocation.DefaultHostNameSupplier

All Implemented Interfaces:

Serializable, TaskManagerLocation.HostNameSupplier

Enclosing class:

TaskManagerLocation

@VisibleForTesting
public static class TaskManagerLocation.DefaultHostNameSupplier
extends Object
implements TaskManagerLocation.HostNameSupplier

This Supplier class could retrieve the FQDN host name of the given InetAddress on demand, extract the pure host name and cache the results for later use.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
DefaultHostNameSupplier(InetAddress inetAddress)

Method Summary

Modifier and Type	Method	Description
String	getFqdnHostName()	Returns the fully-qualified domain name the TaskManager.
String	getHostName()	Gets the hostname of the TaskManager.

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultHostNameSupplier

public DefaultHostNameSupplier(InetAddress inetAddress)

Method Details

getHostName

public String getHostName()

Gets the hostname of the TaskManager. The hostname derives from the fully qualified domain name (FQDN, see TaskManagerLocation.getFQDNHostname()):

• If the FQDN is the textual IP address, then the hostname is also the IP address
• If the FQDN has only one segment (such as "localhost", or "host17"), then this is used as the hostname.
• If the FQDN has multiple segments (such as "worker3.subgroup.company.net"), then the first segment (here "worker3") will be used as the hostname.

Specified by:

getHostName in interface TaskManagerLocation.HostNameSupplier

Returns:

The hostname of the TaskManager.

getFqdnHostName

public String getFqdnHostName()

Returns the fully-qualified domain name the TaskManager. If the name could not be determined, the return value will be a textual representation of the TaskManager's IP address.

Specified by:

getFqdnHostName in interface TaskManagerLocation.HostNameSupplier

Returns:

The fully-qualified domain name of the TaskManager.