tachyon.util

Class NetworkUtils

java.lang.Object

tachyon.util.NetworkUtils

public final class NetworkUtils
extends Object

Common network utilities shared by all components in Tachyon.

Method Summary

Methods

Modifier and Type	Method and Description
static String	getFqdnHost(InetSocketAddress addr) Get FQDN(Full Qualified Domain Name) from representations of network address in Tachyon, except String representation which should be handled by #resolveHostName(String hostname) which will handle the situation where hostname is null.
static String	getFqdnHost(NetAddress addr)
static String	getLocalHostName()
static String	getLocalIpAddress()
static int	getPort(org.apache.thrift.transport.TNonblockingServerSocket thriftSocket) Gets the port for the underline socket.
static ServerSocket	getSocket(org.apache.thrift.transport.TNonblockingServerSocket thriftSocket) Extracts the port from the thrift socket.
static TachyonURI	replaceHostName(TachyonURI path) 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

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 TachyonURI replaceHostName(TachyonURI path)
                                  throws UnknownHostException

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

Parameters:

path - 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.

getFqdnHost

public static String getFqdnHost(InetSocketAddress addr)

Get FQDN(Full Qualified Domain Name) from representations of network address in Tachyon, except String representation which should be handled by #resolveHostName(String hostname) which will handle the situation where hostname is null.

Parameters:

addr - the input network address representation, can not be null

Returns:

the resolved FQDN host name

getFqdnHost

public static String getFqdnHost(NetAddress addr)
                          throws UnknownHostException

Throws:

UnknownHostException

getPort

public static int getPort(org.apache.thrift.transport.TNonblockingServerSocket thriftSocket)

Gets the port for the underline socket. This function calls getSocket(org.apache.thrift.transport.TNonblockingServerSocket), so reflection will be used to get the port.

See Also:

getSocket(org.apache.thrift.transport.TNonblockingServerSocket)

getSocket

public static ServerSocket getSocket(org.apache.thrift.transport.TNonblockingServerSocket thriftSocket)

Extracts the port from the thrift socket. As of thrift 0.9, the internal socket used is not exposed in the API, so this function will use reflection to get access to it.

Throws:

RuntimeException - if reflection calls fail