[CI] GitHub Actions reverse lookup for hostname is inconsistent #10232
Description
Problem
A lot of builds are currently failing in CI. The problem seems to be inconsistency in reverse lookups for the hostname.
Problems such as
[ERROR] testPartitions(org.apache.pulsar.proxy.server.ProxyParserTest) Time elapsed: 130.261 s <<< FAILURE!
org.apache.pulsar.client.api.PulsarClientException: java.util.concurrent.ExecutionException: org.apache.pulsar.client.api.PulsarClientE
xception: java.util.concurrent.CompletionException: io.netty.channel.ConnectTimeoutException: connection timed out: /10.1.0.56:37577
at org.apache.pulsar.client.api.PulsarClientException.unwrap(PulsarClientException.java:1027)
at org.apache.pulsar.client.impl.ProducerBuilderImpl.create(ProducerBuilderImpl.java:95)
at org.apache.pulsar.proxy.server.ProxyParserTest.testPartitions(ProxyParserTest.java:153)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.util.concurrent.ExecutionException: org.apache.pulsar.client.api.PulsarClientException: java.util.concurrent.Completion
Exception: io.netty.channel.ConnectTimeoutException: connection timed out: /10.1.0.56:37577
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
at org.apache.pulsar.client.impl.ProducerBuilderImpl.create(ProducerBuilderImpl.java:93)
... 13 more
Caused by: org.apache.pulsar.client.api.PulsarClientException: java.util.concurrent.CompletionException: io.netty.channel.ConnectTimeou
tException: connection timed out: /10.1.0.56:37577
at org.apache.pulsar.client.impl.ConnectionPool.lambda$null$9(ConnectionPool.java:216)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 more
Caused by: java.util.concurrent.CompletionException: io.netty.channel.ConnectTimeoutException: connection timed out: /10.1.0.56:37577
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:661)
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:646)
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
at org.apache.pulsar.common.util.netty.ChannelFutures.lambda$toCompletableFuture$0(ChannelFutures.java:58)
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)
Example of the problem
Here's a screenshot of a ssh debugging session where I used https://github.com/lhotari/github-actions-debug and https://github.com/lhotari/action-upterm to get a ssh shell in a GitHub Runner VM.
When doing nslookup for the short hostname (hostname -s) or long hostname (hostname -f), nslookup returns various IP addresses which aren't the IP address of the current host.
