Welcome to the CRaC Project!
The CRaC (Coordinated Restore at Checkpoint) Project researches coordination of Java programs with mechanisms to checkpoint (make an image of, snapshot) a Java instance while it is executing. Restoring from the image could be a solution to some of the problems with the start-up and warm-up times. The primary aim of the Project is to develop a new standard mechanism-agnostic API to notify Java programs about the checkpoint and restore events. Other research activities will include, but will not be limited to, integration with existing checkpoint/restore mechanisms and development of new ones, changes to JVM and JDK to make images smaller and ensure they are correct.
masterbranch - synced automatically with the master branch of openjdk/jdk
crac- java.crac Java API and proof-of-concept implementation
Download the EA build and give it a try! There is a work-in-progress HOWTO.
Making changes to the code
Minor changes (build failures fixes, typos, ...) can be pushed directly. Pull Request is a recommended way since it will check the build succeeds.
For new features and major changes, use Skara:
- create a JBS issue in JDK project with Affected and Fix Version equal to
- make a Pull Request following suggestions from the Skara bot (Change must not contain extraneous whitespace, Commit message must refer to an issue, Change must be properly reviewed)
- wait for the peer-review (all members of the project can approve the PR)
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