tachyon.util

Class NetworkUtils

java.lang.Object

tachyon.util.NetworkUtils

public class NetworkUtils
extends Object

Common network utilities shared by all components in Tachyon.

Constructor Summary

Constructors

Constructor and Description
NetworkUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static String	getLocalHostName()
static String	getLocalIpAddress()
static String	replaceHostName(String addr) Replace and resolve the hostname in a given address or path string.
static String	resolveHostName(String hostname) Resolve a given hostname by a canonical hostname.

Methods inherited from class java.lang.Object

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

Constructor Detail

NetworkUtils

public NetworkUtils()

Method Detail

getLocalHostName

public static String getLocalHostName()

Returns:

the local host name, which is not based on a loopback ip address.

getLocalIpAddress

public static String getLocalIpAddress()

Returns:

the local ip address, which is not a loopback address.

replaceHostName

public static String replaceHostName(String addr)
                              throws UnknownHostException

Replace and resolve the hostname in a given address or path string.

Parameters:

addr - an address or path string, e.g., "hdfs://host:port/dir", "file:///dir", "/dir".

Returns:

an address or path string with hostname resolved, or the original path intact if no hostname is embedded, or null if the given path is null or empty.

Throws:

UnknownHostException - if the hostname cannot be resolved.

resolveHostName

public static String resolveHostName(String hostname)
                              throws UnknownHostException

Resolve a given hostname by a canonical hostname. When a hostname alias (e.g., those specified in /etc/hosts) is given, the alias may not be resolvable on other hosts in a cluster unless the same alias is defined there. In this situation, loadufs would break.

Parameters:

hostname - the input hostname, which could be an alias.

Returns:

the canonical form of the hostname, or null if it is null or empty.

Throws:

UnknownHostException - if the given hostname cannot be resolved.