[WIP] CRaC POC

[danielkec]

Helidon MP on CRaC

Coordinated Restore at Checkpoint

Helidon MP Implicit example on CRaC

examples/crac/README.md

mvn clean package
docker build --build-arg CR_DIR=~/cr -t crac-helloworld . -f Dockerfile.crac
# First time ran, checkpoint is created, stop with Ctrl-C
docker run --privileged -p 7001:7001 --name crac-helloworld crac-helloworld
# Second time starting from checkpoint, stop with Ctrl-C
docker start -i crac-helloworld

[rvansa]

Hi @danielkec , I've played with this a bit to let CRaC checkpoint the webserver after it starts: https://github.com/rvansa/helidon/tree/crac-poc
I've manually checked that I can curl localhost:7001, then execute docker exec -it crac-helloworld jcmd helidon-examples-microprofile-hello-world-implicit.jar JDK.checkpoint and then curl it again. There might be some synchronization pecularities missing, but the code looks like the only synchronization I need is with LoomServer.start()/stop() methods as provided. Let me know if I am wrong.