Managing sun.nio.ch.Poller with CRaC

[Volker Simonis]

Forwarding to crac-dev...

Alan Bateman <Alan.Bateman at oracle.com> schrieb am Di., 16. Apr. 2024, 08:28:

> On 15/04/2024 22:32, Cleber Muramoto wrote:
> > Hello!
> >
> > I am trying to take a checkpoint using zulu's CRaC.
> >
> > When using VirtualThreads the checkpoint fails because of open file
> > descriptors created by EPollPoller.
> >
> > As of now, I think the only possible way to close the FD's is by
> > accessing the private read/write pollers to fetch the epfd's and
> > manually closing them. (I tried the jdk.crac.resource-policies but it
> > doesn't seem to pick up these FDs).
> >
> > While this works to capture the snapshot, restoring is another story,
> > since the poller threads don't expect the epfds to change.
> >
> > Are there any plans to add some sort of lifecycle api to Poller to
> > make it CRaC friendly?
>
> I assume this must be a build that uses code from the OpenJDK CRaC
> project as this is not a feature in the JDK main line. You may have to
> ask on crac-dev. There are literally dozens of places right across the
> JDK that would need attention in order to sanely snapshot and continue
> from arbitrary points like this. I haven't had cycles to track what they
> have in the current exploration/prototype but I'm sure the folks on
> crac-dev can help.
>
> -Alan
>
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