Can't get actual port from ServerConfig when using random port

[javeme]

Describe the bug

A clear and concise description of what the bug is.

Expected behavior

Expect to add port() method to com.alipay.sofa.rpc.server.Server interface, we can get the actual port from server implementation.

Actual behavior

ServerConfig.getPort() returns 0

Steps to reproduce

new ServerConfig().setPort(0)
                  .setHost("127.0.0.1")
                  .setProtocol("bolt")

Environment

• SOFARPC version: 5.7.6
• JVM version : java8
• OS version : mac
• Maven version:
• IDE version: eclipse

[ujjboy]

@javeme You can use new ServerConfig().setAdaptivePort(true); and invoke serverConfig.getPort() after the server started.

[javeme]

@ujjboy Thank you for your reply.
I tried setAdaptivePort(true) after got your reply, but when multiple jobs(like YARN container) were started at the same time, they may still compete for the same port, resulting in a race error "Address already in use".

In this scenario, it would be a perfect solution if sofa-rpc can support random port.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[javeme]

@ujjboy There is still race condition with setAdaptivePort(true): "Address already in use", could you please take a look?

sofa-rpc/core/api/src/main/java/com/alipay/sofa/rpc/common/utils/NetUtils.java

Line 99 in 10dc585

public static int getAvailablePort(String host, int port, int maxPort) {

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.