Package org.apache.flink.runtime.net

Class ConnectionUtils

java.lang.Object

org.apache.flink.runtime.net.ConnectionUtils

public class ConnectionUtils
extends Object

Utilities to determine the network interface and address that should be used to bind the TaskManager communication to.

Implementation note: This class uses System.nanoTime() to measure elapsed time, because that is not susceptible to clock changes.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ConnectionUtils.LeaderConnectingAddressListener	A LeaderRetrievalListener that allows retrieving an InetAddress for the current leader.

Constructor Summary

Constructors

Constructor	Description
ConnectionUtils()

Method Summary

Modifier and Type	Method	Description
static InetAddress	findConnectingAddress(InetSocketAddress targetAddress, long maxWaitMillis, long startLoggingAfter)	Finds the local network address from which this machine can connect to the target address.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConnectionUtils

public ConnectionUtils()

Method Detail

findConnectingAddress

public static InetAddress findConnectingAddress(InetSocketAddress targetAddress,
                                                long maxWaitMillis,
                                                long startLoggingAfter)
                                         throws IOException

Finds the local network address from which this machine can connect to the target address. This method tries to establish a proper network connection to the given target, so it only succeeds if the target socket address actually accepts connections. The method tries various strategies multiple times and uses an exponential backoff timer between tries.

If no connection attempt was successful after the given maximum time, the method will choose some address based on heuristics (excluding link-local and loopback addresses.)

This method will initially not log on info level (to not flood the log while the backoff time is still very low). It will start logging after a certain time has passes.

Parameters:

targetAddress - The address that the method tries to connect to.

maxWaitMillis - The maximum time that this method tries to connect, before falling back to the heuristics.

startLoggingAfter - The time after which the method will log on INFO level.

Throws:

IOException