Call for Discussion: New Project: CRaC
vladimir.kozlov at oracle.com
Tue Jul 27 17:07:56 UTC 2021
The HotSpot group will participate in sponsoring this project.
On 7/18/21 7:48 AM, Anton Kozlov wrote:
> It's been a while since we presented Coordinated Restore at Checkpoint for the
> first time . We are still committed to the idea and researching this topic.
> Java applications can avoid the long start-up and warm-up by saving the state
> of the Java runtime (snapshot, checkpoint). The saved state is then used to
> start instances fast (restored). But after the state was saved, the execution
> environment could change. Also, if multiple instances are started from the
> saved state simultaneously, they should obtain some uniqueness, and their
> executions should diverge at some point.
> We believe that the practical way to solve these problems is to make Java
> applications aware of when the state is saved and restored. Then an
> application will be able to handle environmental changes. The application will
> also be able to obtain uniqueness from the environment.
> The CRaC project aims to research Java API for coordination between application
> and runtime to save and restore the state. Runtime should support multiple
> ways to save the state: virtual machine snapshot, container snapshot, CRIU
> project on Linux, etc. We hope to come with an API that is general enough for
> any underlying mechanism. We also plan to explore safety checks in the API and
> runtime, which prevent saving the state if it may not be restored or work
> correctly after the restore.
> I propose myself as a Project Lead of the CRaC Project. If you're interested
> or want to be the committer, please drop me a message.
> A fork of JDK  would be a starting point of this project.
>  https://mail.openjdk.java.net/pipermail/discuss/2020-September/005594.html
>  https://github.com/CRaC/jdk
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