httpclient connectTimeout does not work expected

[jinwik]

Questions

httpclient sets connecttimeout, when the connection fails (possibly due to network jitter or upstream performance issues), the duration of connect failed callback may be less than the connecttimeout.

CircuitBreaker '****' recorded an error: 'io.netty.channel.ConnectTimeoutException: connection timed out: */'. Elapsed time: 1 ms
io.netty.channel.ConnectTimeoutException: connection timed out: **
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:267)
at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38)
at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:127)
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:462)
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:748)

Version

3.6.x - 3.9.x

Do you have a reproducer?

https://gist.github.com/jinwik/569938388962a457a93ee87d9b9c6732

[jinwik]

update the reproducer

[rusuionut]

+1 for this issue, we're reproducing this more in Microsoft Azure cloud and less in AWS. We configured the timeout to be at 10 seconds and we get the error after 200/300ms sometimes. Thanks.

[vietj]

can you elaborate more precisely what the issue is ?

[jinwik]

vertx httpclient or webclient sets the connection timeout, for example 5 seconds, sometimes it failed and throws io.netty.channel.ConnectTimeoutException but the whole request time is much less than the configured value, for example 1ms, it is so weird.

[tfemiani-godaddy]

I'm seeing this as well with setConnectTimeout(2000) and actual timeouts sometimes taking less than 300ms.