cmccabe commented on code in PR #13169:
URL: https://github.com/apache/kafka/pull/13169#discussion_r1092446989
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core/src/main/scala/kafka/network/SocketServer.scala:
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@@ -573,7 +591,20 @@ private[kafka] abstract class Acceptor(val socketServer:
SocketServer,
private val listenBacklogSize = config.socketListenBacklogSize
private val nioSelector = NSelector.open()
- private[network] val serverChannel = openServerSocket(endPoint.host,
endPoint.port, listenBacklogSize)
+
+ // If the port is configured as 0, we are using a random (ephemeral) port,
so we need to open
+ // the socket before we can find out what port we have. If it is set to a
nonzero value, defer
+ // opening the socket until we start the Acceptor. The reason for deferring
the socket opening
+ // is so that systems which assume that the socket being open indicates
readiness are not
+ // confused.
+ private[network] var serverChannel: ServerSocketChannel = _
+ private[network] val localPort: Int = if (endPoint.port != 0) {
Review Comment:
good idea. let me wait for this test run to complete then I'll add a log
message
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