Re: 答复: create a fork under openjdk

[Remi Forax]

----- Mail original -----
> De: "李三红(三红)" <sanhong.lsh at alibaba-inc.com>
> À: "Christine Flood" <chf at redhat.com>
> Cc: "discuss" <discuss at openjdk.java.net>
> Envoyé: Mardi 9 Février 2021 08:03:15
> Objet: 答复: create a fork under openjdk

> Hi Christine,
> 
> Thanks for your comments  - the challenge of using CRIU is we can not handle the
> state migration of the java application.
> 
> The situation will become more worse when the application evolves forward, and
> we don’t have a good mechanism(may consider a middleware framework?) to enforce
> the ‘stateless constraints’ for their development.
> 
> 
> 
> Thanks!
> 
> Sanhong


Hi Sanhong,
this seems orthogonal, why do you want state migration on top of CRIU ?

You can use CRIU just as a way to start your application in steady state skipping the warmup phase.
So you build your app, then you run it with fake traffic then save the states with CRIU.
If you update the app, instead of trying to migrate states, you just rebuild it, etc.

regards,
Rémi

> 
> 发件人: Christine Flood <chf at redhat.com>
> 发送时间: 2021年2月5日 1:16
> 收件人: 李三红(三红) <sanhong.lsh at alibaba-inc.com>
> 抄送: discuss at openjdk.java.net
> 主题: Re: create a fork under openjdk
> 
> 
> 
> Have you guys looked at CRIU at all?  If you are running on Linux it gives you
> the capability of firing up a warmed up Java application in minutes.
> 
> 
> 
> For example the TODO app (https://github.com/cescoffier/quarkus-todo-app) takes
> 1.837 seconds to start but only  0.11 seconds to restore.
> 
> 
> 
> I've attached a console log showing the commands I used.
> 
> 
> 
> If you want greater control, I've written a Java API you can tinker with:
> https://github.com/chflood/JavaCriuJar.
> 
> 
> 
> Unfortunately this is a Linux only capability.
> 
> 
> 
> 
> 
> Christine
> 
> 
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> 
> On Wed, Jan 27, 2021 at 7:14 AM 李三红(三红) <sanhong.lsh at alibaba-inc.com
> <mailto:sanhong.lsh at alibaba-inc.com> > wrote:
> 
> Hello,
> 
> We are working on the fast-startup related development based on JDK11u. To
> facilitate community collaboration(sharing backports, bug fixing, patches,
> etc. across different companies/parties based on the repo), we are exploring
> creating the fork of JDK11u under the OpenJDK group [1]
> 
> 
> 
> Can anyone help with this, or is there a way/process we can follow to do
> that? - Your help or any input is much appreciated.
> 
> 
> 
> [1]  <https://github.com/openjdk> https://github.com/openjdk
> 
> 
> 
> Thanks!
> 
> Sanhong