netty: Avoid TCP_USER_TIMEOUT warning when not using epoll (#11564) · grpc/grpc-java@62f4098
@@ -241,13 +241,6 @@ public Runnable start(Listener transportListener) {
241241b.channelFactory(channelFactory);
242242// For non-socket based channel, the option will be ignored.
243243b.option(SO_KEEPALIVE, true);
244-// For non-epoll based channel, the option will be ignored.
245-if (keepAliveTimeNanos != KEEPALIVE_TIME_NANOS_DISABLED) {
246-ChannelOption<Integer> tcpUserTimeout = Utils.maybeGetTcpUserTimeoutOption();
247-if (tcpUserTimeout != null) {
248-b.option(tcpUserTimeout, (int) TimeUnit.NANOSECONDS.toMillis(keepAliveTimeoutNanos));
249- }
250- }
251244for (Map.Entry<ChannelOption<?>, ?> entry : channelOptions.entrySet()) {
252245// Every entry in the map is obtained from
253246// NettyChannelBuilder#withOption(ChannelOption<T> option, T value)
@@ -286,6 +279,20 @@ public void run() {
286279 };
287280 }
288281channel = regFuture.channel();
282+// For non-epoll based channel, the option will be ignored.
283+try {
284+if (keepAliveTimeNanos != KEEPALIVE_TIME_NANOS_DISABLED
285+&& Class.forName("io.netty.channel.epoll.AbstractEpollChannel").isInstance(channel)) {
286+ChannelOption<Integer> tcpUserTimeout = Utils.maybeGetTcpUserTimeoutOption();
287+if (tcpUserTimeout != null) {
288+int tcpUserTimeoutMs = (int) TimeUnit.NANOSECONDS.toMillis(keepAliveTimeoutNanos);
289+channel.config().setOption(tcpUserTimeout, tcpUserTimeoutMs);
290+ }
291+ }
292+ } catch (ClassNotFoundException ignored) {
293+// JVM did not load AbstractEpollChannel, so the current channel will not be of epoll type,
294+// so there is no need to set TCP_USER_TIMEOUT
295+ }
289296// Start the write queue as soon as the channel is constructed
290297handler.startWriteQueue(channel);
291298// This write will have no effect, yet it will only complete once the negotiationHandler