Unable to load MacOSDnsServerAddressStreamProvider on Apple Silicon with statsd meter registries

[simondemartini]

Describe the bug
When running a statsd meter registry on an Apple Silicon based machine with native (arm64) java, Micrometer logs the following error:

ERROR io.micrometer.shaded.io.netty.resolver.dns.DnsServerAddressStreamProviders - Unable to load io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider, fallback to system defaults. This may result in incorrect DNS resolutions on MacOS.

Environment

• Micrometer version: 1.8.3
• Micrometer registry: statsd
• OS: macOS
• CPU: Apple Silicon M1 (arm64)
• Java version: 11.0.14 (Zulu, arm64 native)

To Reproduce
How to reproduce the bug:
Launch a Spring Boot application with a statsd meter registry on an Apple Silicon based computer. The error and full stack trace will be logged like the following:

1398 [main] ERROR io.micrometer.shaded.io.netty.resolver.dns.DnsServerAddressStreamProviders - Unable to load io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider, fallback to system defaults. This may result in incorrect DNS resolutions on MacOS.
java.lang.reflect.InvocationTargetException: null
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[?:?]
	at io.micrometer.shaded.io.netty.resolver.dns.DnsServerAddressStreamProviders.<clinit>(DnsServerAddressStreamProviders.java:64) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.io.netty.resolver.dns.DnsNameResolverBuilder.<init>(DnsNameResolverBuilder.java:60) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.transport.NameResolverProvider.newNameResolverGroup(NameResolverProvider.java:479) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.udp.UdpResources.getOrCreateDefaultResolver(UdpResources.java:242) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.udp.UdpClientConfig.defaultAddressResolverGroup(UdpClientConfig.java:105) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.transport.ClientTransportConfig.resolverInternal(ClientTransportConfig.java:224) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.transport.ClientTransport.connect(ClientTransport.java:59) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.netty.udp.UdpClient.connect(UdpClient.java:87) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.lambda$connectAndSubscribe$13(StatsdMeterRegistry.java:284) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.FluxRetryWhen.subscribe(FluxRetryWhen.java:77) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.MonoRetryWhen.subscribeOrReturn(MonoRetryWhen.java:46) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.Mono.subscribe(Mono.java:4385) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.Mono.subscribeWith(Mono.java:4515) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.Mono.subscribe(Mono.java:4371) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.Mono.subscribe(Mono.java:4307) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.reactor.core.publisher.Mono.subscribe(Mono.java:4254) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.retryReplaceClient(StatsdMeterRegistry.java:293) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.connectAndSubscribe(StatsdMeterRegistry.java:282) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.prepareUdpClient(StatsdMeterRegistry.java:251) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.start(StatsdMeterRegistry.java:225) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.<init>(StatsdMeterRegistry.java:155) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry.<init>(StatsdMeterRegistry.java:78) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.statsd.StatsdMeterRegistry$Builder.build(StatsdMeterRegistry.java:548) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at 
        ...
Caused by: java.lang.UnsatisfiedLinkError: 'io.micrometer.shaded.io.netty.resolver.dns.macos.DnsResolver[] io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.resolvers()'
	at io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.resolvers(Native Method) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.retrieveCurrentMappings(MacOSDnsServerAddressStreamProvider.java:127) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	at io.micrometer.shaded.io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.<init>(MacOSDnsServerAddressStreamProvider.java:123) ~[micrometer-registry-statsd-1.8.3.jar:1.8.3]
	... 114 more

Expected behavior
The application should be able to load this class or not log the error if it's not significant.

Additional context
This appears to be related to netty/netty#11020 but since Micrometer includes a shaded version of Netty, this can't be fixed by telling applications to include that suggested dependency in the fix.

[shakuzen]

For clarification and prioritization: is running on Apple silicon for development purposes and not production? I recently got a machine with Apple silicon, so I can test things out now. I'm able to see the error log as well, though it seems metrics still make it to a locally running statsd instance.

[simondemartini]

Yeah so far this is just for development purposes

[ariv803]

I am getting this error when using version 1.9.2. Is the fix only in 1.10.0-M3 ? I am trying to use the version compatible with the latest spring version according to this: https://docs.spring.io/spring-boot/docs/2.7.2/reference/html/dependency-versions.html#appendix.dependency-versions
Also 1.10.0-M3 gives me an error:
Caused by: java.lang.ClassNotFoundException io.micrometer.common.util.internal.logging.WarnThenDebugLogger

[shakuzen]

The change that resolved this is not included in 1.9.x releases. Since the error log is generally only expected to happen on developer machines and it does not affect functionality, the decision was made to not add risk to a patch release by including the changes.

Also 1.10.0-M3 gives me an error

You would need to use the version of Spring Boot compatible with Micrometer 1.10.0-M3 to avoid that error.

[gkonovalov]

Hi @shakuzen
Thank you so much for the Micrometer library!
I wonder if you are planning to add native (aarch_64) Netty DNS resolver in the next Micrometer release or provide a way how we can add native Netty DNS resolver as a separate Gradle dependency?

[shakuzen]

@gkonovalov the resolution of this issue was to add the aarch64 macos Netty DNS resolver dependency. You can try out 1.10.0-RC1 or the latest snapshots that contain that. The 1.10.0 GA is planned for next week. Let us know if the issue is not fixed for you in those versions.

[gkonovalov]

Thank you so much!