Hi, When binding an Epoll Datagram Bootstrap, if EpollChannelOption.SO_REUSEPORT is enabled and the epoll eventLoopGroup thread count is set to > 1, the following warning and exception is observed in my application log.
2017-02-21 17:34:19.367 WARN 31685 --- [ntLoopGroup-2-2] io.netty.channel.ChannelInitializer : Failed to initialize a channel. Closing: [id: 0xfc5ace34] io.netty.channel.ChannelPipelineException: io.netty.handler.codec.DatagramPacketEncoder is not a @Sharable handler, so can't be added or removed multiple times. at io.netty.channel.DefaultChannelPipeline.checkMultiplicity(DefaultChannelPipeline.java:587) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:199) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:392) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:379) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at MyChannelInitializer.initChannel() at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:113) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:105) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:597) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.access$000(DefaultChannelPipeline.java:44) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1387) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1122) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.DefaultChannelPipeline.invokeHandlerAddedIfNeeded(DefaultChannelPipeline.java:647) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:506) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:419) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:478) [netty-all-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [netty-common-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [netty-common-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:304) [netty-transport-native-epoll-4.1.8.Final-linux-x86_64.jar!/:4.1.8.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-common-4.1.8.Final.jar!/:4.1.8.Final] at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144) [netty-common-4.1.8.Final.jar!/:4.1.8.Final] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111] I have a single ChannelInitializer (MyChannelInitializer). The initChannel method is invoked by each thread in the EventLoopGroup. It succeeds for thread eventLoopGroup-2-1 but appears to fail for eventLoopGroup-2-2. java version "1.8.0_111" Java(TM) SE Runtime Environment (build 1.8.0_111-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode) Netty : 4.1.8.Final Is this expected behaviour? Regards, Joe -- You received this message because you are subscribed to the Google Groups "Netty discussions" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/netty/c76e9e07-862b-44b5-ae4e-4c2c70cd9864%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
