mumrah commented on code in PR #13169:
URL: https://github.com/apache/kafka/pull/13169#discussion_r1092435602
##########
core/src/main/scala/kafka/network/SocketServer.scala:
##########
@@ -585,23 +616,35 @@ private[kafka] abstract class Acceptor(val socketServer:
SocketServer,
private var currentProcessorIndex = 0
private[network] val throttledSockets = new
mutable.PriorityQueue[DelayedCloseSocket]()
private var started = false
- private[network] val startFuture = new CompletableFuture[Void]()
+ private[network] val startedFuture = new CompletableFuture[Void]()
val thread = KafkaThread.nonDaemon(
s"${threadPrefix()}-kafka-socket-acceptor-${endPoint.listenerName}-${endPoint.securityProtocol}-${endPoint.port}",
this)
- startFuture.thenRun(() => synchronized {
- if (!shouldRun.get()) {
- debug(s"Ignoring start future for ${endPoint.listenerName} since the
acceptor has already been shut down.")
- } else {
+ def start(): Unit = synchronized {
+ try {
+ if (!shouldRun.get()) {
+ throw new ClosedChannelException()
Review Comment:
How does this happen? If the kafka server is shutdown before the socket
server is able to finish starting?
##########
core/src/main/scala/kafka/network/SocketServer.scala:
##########
@@ -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:
It might be good to log when we are opening the socket server early.
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