Local Embedded Redis does not work with 3.9.1

Here is the other issue I created. Just like the other ticket, as soon as I downgrade to 3.8.2, everything works just fine.

Expected behavior

Redisson should be able to connect to local redis running on port 6614.

Actual behavior

Redisson won’t start and throws this error:

Caused by: org.redisson.client.RedisConnectionException: Unable to connect to Redis server: localhost/127.0.0.1:6614
        at org.redisson.connection.pool.ConnectionPool$2$1.operationComplete(ConnectionPool.java:160)
        at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511)
        at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424)
        at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121)
        at org.redisson.misc.RedissonPromise.tryFailure(RedissonPromise.java:108)
        at org.redisson.connection.pool.ConnectionPool.promiseFailure(ConnectionPool.java:327)
        at org.redisson.connection.pool.ConnectionPool.access$400(ConnectionPool.java:53)
        at org.redisson.connection.pool.ConnectionPool$4.operationComplete(ConnectionPool.java:291)
        at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:504)
        at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:483)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424)
        at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121)
        at org.redisson.misc.RedissonPromise.tryFailure(RedissonPromise.java:108)
        at org.redisson.client.RedisClient$2$1$2.run(RedisClient.java:250)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:466)
        at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: failed to create a new resolver
        at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:71)
        at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:200)
        at io.netty.bootstrap.Bootstrap.access$000(Bootstrap.java:49)
        at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:188)
        at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:174)
        at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511)
        at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424)
        at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:103)
        at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetSuccess(AbstractChannel.java:978)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:512)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:423)
        at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:482)
        ... 6 common frames omitted
Caused by: java.lang.IllegalStateException: failed to create a new resolver
        at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:71)
        at org.redisson.connection.dns.MultiDnsAddressResolverGroup.newResolver(MultiDnsAddressResolverGroup.java:68)
        at io.netty.resolver.dns.DnsAddressResolverGroup.newResolver(DnsAddressResolverGroup.java:79)
        at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:69)
        ... 19 common frames omitted
Caused by: io.netty.channel.ChannelException: Unable to create Channel from class class io.netty.channel.socket.nio.NioDatagramChannel
        at io.netty.channel.ReflectiveChannelFactory.newChannel(ReflectiveChannelFactory.java:40)
        at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:320)
        at io.netty.bootstrap.AbstractBootstrap.register(AbstractBootstrap.java:234)
        at io.netty.resolver.dns.DnsNameResolver.<init>(DnsNameResolver.java:394)
        at io.netty.resolver.dns.DnsNameResolverBuilder.build(DnsNameResolverBuilder.java:430)
        at io.netty.resolver.dns.DnsAddressResolverGroup.newNameResolver(DnsAddressResolverGroup.java:114)
        at io.netty.resolver.dns.DnsAddressResolverGroup.newResolver(DnsAddressResolverGroup.java:94)
        at io.netty.resolver.dns.DnsAddressResolverGroup.newResolver(DnsAddressResolverGroup.java:79)
        at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:69)
        ... 22 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
        at sun.reflect.GeneratedConstructorAccessor33.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at io.netty.channel.ReflectiveChannelFactory.newChannel(ReflectiveChannelFactory.java:38)
        ... 30 common frames omitted
Caused by: io.netty.channel.ChannelException: Failed to open a socket.
        at io.netty.channel.socket.nio.NioDatagramChannel.newSocket(NioDatagramChannel.java:88)
        at io.netty.channel.socket.nio.NioDatagramChannel.<init>(NioDatagramChannel.java:116)
        ... 34 common frames omitted
Caused by: java.net.SocketException: maximum number of DatagramSockets reached
        at sun.net.ResourceManager.beforeUdpCreate(ResourceManager.java:73)
        at sun.nio.ch.DatagramChannelImpl.<init>(DatagramChannelImpl.java:111)
        at sun.nio.ch.SelectorProviderImpl.openDatagramChannel(SelectorProviderImpl.java:42)
        at io.netty.channel.socket.nio.NioDatagramChannel.newSocket(NioDatagramChannel.java:86)
        ... 35 common frames omitted

Steps to reproduce or test case

Redis version

2.8.19 with embedded-redis

Redisson version

3.9.1

Redisson configuration

	final org.redisson.config.Config rConfig = new org.redisson.config.Config()
			.setTransportMode(TransportMode.NIO);
	rConfig.useSingleServer()
			.setAddress("redis://localhost:6614")
			.setPassword(password);

[0xadam]

The JVM appears to limit the number of DatagramSockets to 25 by default, and now that Redisson has 32 Netty threads by default it appears that more Netty threads are created than the allowed amount of DatagramSockets (I’m assuming 32 are created). So the other option is to decrease the number of Netty threads that Redisson creates through its configuration.

[Flo354]

@lbispham just add it as a VM option when you start play framework from the command line