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Add Socket Connection Timeout to CallbackClient and PythonClient #526

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Leniox wants to merge 1 commit into py4j:master from Leniox:garonson/issue-525

Leniox commented Jul 13, 2023

Solution 1 as part of #525


          Add socket connect timeout to CallbackClient and PythonClient

62a6cb1

Leniox changed the title ~~Add socket connect timeout to CallbackClient and PythonClient~~ Add Socket Connection Timeout to CallbackClient and PythonClient

schlosna reviewed

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schlosna left a comment

I think we might want to s/createSocketTimeout/connectTimeout/ and use the existing GatewayServer.DEFAULT_CONNECT_TIMEOUT to provide API backward compatibility. There are a few places that already have connectTimeout but aren't wiring it through to socket connect.

py4j-java/src/main/java/py4j/CallbackClient.java

@@ @@ -90,6 +90,7 @@ public class CallbackClient implements Py4JPythonClient { @@
               	protected final boolean enableMemoryManagement;
               	protected final int readTimeout;
+              	protected final int createSocketTimeout;

schlosna Jul 14, 2023

should this be connectTimeout?

Suggested change

      
            	protected final int createSocketTimeout;
          
            	protected final int connectTimeout;

Member

HyukjinKwon Jul 14, 2023

+1 for this renaming

py4j-java/src/main/java/py4j/CallbackClient.java

               	public CallbackClient(int port, InetAddress address, long minConnectionTime, TimeUnit minConnectionTimeUnit,
               			SocketFactory socketFactory, boolean enableMemoryManagement) {
               		this(port, address, minConnectionTime, minConnectionTimeUnit, socketFactory, enableMemoryManagement,
-              				GatewayServer.DEFAULT_READ_TIMEOUT);
+              				GatewayServer.DEFAULT_READ_TIMEOUT, GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT);

schlosna Jul 14, 2023

Suggested change

      
            				GatewayServer.DEFAULT_READ_TIMEOUT, GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT);
          
            				GatewayServer.DEFAULT_READ_TIMEOUT, GatewayServer.DEFAULT_CONNECT_TIMEOUT);

py4j-java/src/main/java/py4j/CallbackClient.java

               	 *            Python program is closed.
               	 */
               	public CallbackClient(int port, InetAddress address, long minConnectionTime, TimeUnit minConnectionTimeUnit,
-              			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout) {
+              			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout, int createSocketTimeout) {

schlosna Jul 14, 2023

Suggested change

      
            			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout, int createSocketTimeout) {
          
            			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout, int connectTimeout) {

py4j-java/src/main/java/py4j/CallbackClient.java

               		this(port, address, null, minConnectionTime, minConnectionTimeUnit, socketFactory, enableMemoryManagement,
-              				readTimeout);
+              				readTimeout, createSocketTimeout);

schlosna Jul 14, 2023

Suggested change

      
            				readTimeout, createSocketTimeout);
          
            				readTimeout, connectTimeout);

py4j-java/src/main/java/py4j/CallbackClient.java

Comment on lines 180 to +181

               	public CallbackClient(int port, InetAddress address, long minConnectionTime, TimeUnit minConnectionTimeUnit,
-              			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout) {
+              			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout, int createSocketTimeout) {

schlosna Jul 14, 2023

To avoid an API break, probably want to keep a constructor of the existing signature and use default socket connect timeout.

public CallbackClient(int port, InetAddress address, long minConnectionTime, TimeUnit minConnectionTimeUnit,
			SocketFactory socketFactory, boolean enableMemoryManagement, int readTimeout) {
    this(port, address, null, minConnectionTime, minConnectionTimeUnit, socketFactory, enableMemoryManagement,
				readTimeout, GatewayServer.DEFAULT_CONNECT_TIMEOUT);
}

py4j-java/src/test/java/py4j/instrumented/InstrPythonClient.java

@@ @@ -48,9 +48,10 @@ public class InstrPythonClient extends PythonClient { @@
               	public InstrPythonClient(Gateway gateway, List<Class<? extends Command>> customCommands, int pythonPort,
               			InetAddress pythonAddress, long minConnectionTime, TimeUnit minConnectionTimeUnit,
-              			SocketFactory socketFactory, Py4JJavaServer javaServer, boolean enableMemoryManagement, int readTimeout) {
+              			SocketFactory socketFactory, Py4JJavaServer javaServer, boolean enableMemoryManagement, int readTimeout,
+              			int createSocketTimeout) {

schlosna Jul 14, 2023

Suggested change

      
            			int createSocketTimeout) {
          
            			int connectTimeout) {

and 🔭 constructor for API back compat

py4j-java/src/test/java/py4j/instrumented/InstrPythonClient.java

               		super(gateway, customCommands, pythonPort, pythonAddress, minConnectionTime, minConnectionTimeUnit,
-              				socketFactory, javaServer, enableMemoryManagement, readTimeout);
+              				socketFactory, javaServer, enableMemoryManagement, readTimeout, createSocketTimeout);

schlosna Jul 14, 2023

Suggested change

      
            				socketFactory, javaServer, enableMemoryManagement, readTimeout, createSocketTimeout);
          
            				socketFactory, javaServer, enableMemoryManagement, readTimeout, connectTimeout);

py4j-java/src/test/java/py4j/instrumented/InstrumentedClientServerApplication.java

@@ @@ -42,7 +42,8 @@ public void startServer2() { @@
               		InstrClientServer server2 = new InstrClientServer(GatewayServer.DEFAULT_PORT + 5,
               				GatewayServer.defaultAddress(), GatewayServer.DEFAULT_PYTHON_PORT + 5, GatewayServer.defaultAddress(),
               				GatewayServer.DEFAULT_CONNECT_TIMEOUT, GatewayServer.DEFAULT_READ_TIMEOUT,
-              				ServerSocketFactory.getDefault(), SocketFactory.getDefault(), this, false, true);
+              				GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT, ServerSocketFactory.getDefault(),

schlosna Jul 14, 2023

already have GatewayServer.DEFAULT_CONNECT_TIMEOUT

Suggested change

      
            				GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT, ServerSocketFactory.getDefault(),
          
            				ServerSocketFactory.getDefault(),

py4j-java/src/test/java/py4j/instrumented/InstrumentedClientServerApplication.java

Comment on lines +64 to +65

		GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT, ServerSocketFactory.getDefault(),
		SocketFactory.getDefault(), this, false, true);

schlosna Jul 14, 2023

already have GatewayServer.DEFAULT_CONNECT_TIMEOUT

Suggested change

      
            				GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT, ServerSocketFactory.getDefault(),
          
            				SocketFactory.getDefault(), this, false, true);
          
            				ServerSocketFactory.getDefault(), SocketFactory.getDefault(), this, false, true);

py4j-java/src/test/java/py4j/examples/ExampleApplication.java

@@ @@ -98,7 +99,8 @@ public static void main(String[] args) { @@
               			GatewayServer.turnLoggingOff();
               			CallbackClient callbackClient = new CallbackClient(GatewayServer.DEFAULT_PYTHON_PORT,
               					GatewayServer.defaultIPv6Address(), CallbackClient.DEFAULT_MIN_CONNECTION_TIME,
-              					CallbackClient.DEFAULT_MIN_CONNECTION_TIME_UNIT, SocketFactory.getDefault(), false, 250);
+              					CallbackClient.DEFAULT_MIN_CONNECTION_TIME_UNIT, SocketFactory.getDefault(), false, 250,
+              					GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT);

schlosna Jul 14, 2023

Suggested change

      
            					GatewayServer.DEFAULT_CREATE_SOCKET_CONNECTION_TIMEOUT);
          
            					GatewayServer.DEFAULT_CONNECT_TIMEOUT);

Author

Leniox commented Jul 14, 2023

Hey @HyukjinKwon! Thank you for taking the time to look at this.

Context

The reason I made a separate configuration came from my testing. Right now, if I set the connectTimeout to 10000 (10s), I consistently get errors (see attached video)
https://github.com/py4j/py4j/assets/15280977/5d3570ee-69db-46e5-93c6-ac839ff6e2a7

This is confusing, as it appears I've connected to the gateway, sent commands, and during the execution of the command, I get this error. If I use the connectTimeout then it may fix my problem on the initial Socket Connection, but looks like it'll present other problems.

Potential Problem:

On this line in the PythonClient, we set the SoTimeout as the readTimeout

However, on this line in GatewayServer, we use the connectTimeout. It's not clear to me why this is throwing exceptions when I set this value to > 0. Perhaps this is because we do not establish a keepalive (See below)

Problem:

Given the context, I'd be OK to use the connect timeout. But, I have concern that it would present other problems that I encountered above. In order to provide the right solution, I want to ask the following questions to help debug:

Questions:

Should we be using the readTimeout instead of the connectTimeout in the GatewayServer? It feels strange to me that I've made a connection, but I'm still getting these errors during my testing. But, I could be missing something
Is the problem I'm getting related to the fact that we do not establish a KeepAlive? In which case, we'd want to do

The combination of (1) and (2) would look like below, when we create sockets inside both our PythonClient and GatewayServer

        Socket socket = socketFactory.createSocket();
        socket.connect(new InetSocketAddress(address, port), **connectTimeout**);
        socket.setSoTimeout(**readTimeout**);
+       socket.setKeepAlive(true);
+       if (socket.getLocalAddress().isLoopbackAddress()) {
+           socket.setTcpNoDelay(true);
+       }

Any clarification would greatly help me figure out the right solution!

Member

HyukjinKwon commented Jul 20, 2023

FYI, I am trying to make the tests stable first (e.g, reducing matrix first #519). I think we should make the CI green first ..

Author

Leniox commented Aug 8, 2023

I have not had time to back to this, but once I get the time to revisit, I will make the contribution

Member

HyukjinKwon commented Dec 6, 2023

Would be great if anyone finds some time to fix up the CI first. I will try around late this month too.

Member

HyukjinKwon commented Mar 11, 2024

Guys, sorry for the delay. Now the tests are fixed per #519. Would you mind rebasing this one please?

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