Re: [jetty-users] avoiding earlyEOF

[Bill Ross <ross@xxxxxxxxxxxx>]

Is there a simple way to incorporate this in a start.jar from script startup? If not, would it be worth building into jetty?

Thanks,

Bill

> https://github.com/opentable/otj-pausedetector

public class MyCoolApp {
  public static void main(String[] args) {
    try (new JvmPauseAlarm(100, 400).start()) {
      runMyCoolApp();
    }
  }
}

On 6/22/18 10:09 AM, Steven Schlansker wrote:

On Jun 22, 2018, at 9:56 AM, Shawn Heisey <eclipse@xxxxxxxxxxxx> wrote:

On 6/20/2018 11:23 PM, Robben, Bert wrote:

The problem that we face is that we regularly see IOExceptions
exceptions occurring in the communication between these components.

Let's say that you expect all requests to complete in 10 milliseconds or
less.  So you set your timeout to 1 second, thinking that's always going
to be plenty of time.  But then your application fills up its 2GB heap
right in the middle of handling one of those requests, and the resulting
garbage collection pauses the JVM for two seconds.  The entity at the
other end of the connection is going to give up and close the connection
before the program experiencing the GC pause can respond.  Tuning
garbage collection to reduce GC pauses is certainly a good idea, but if
the timeout were 10 seconds instead of one second, it probably would not
have had any problem.

You can (and should!) explicitly monitor these conditions.  The JVM provides interesting
diagnostics output through JMX to monitor it, or you can directly measure:

https://github.com/opentable/otj-pausedetector

I run this in *every* application -- unexpected pauses cause all sorts of troubles,
monitoring it is cheap, and you'll save hours when you have a big warning
"hey, the JVM went to lunch for 30 seconds here, that might be why all this stuff broke"

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