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From Dmitriy Pavlov <dpavlov....@gmail.com>
Subject Re: [IMPORTANT] Apache Ignite 2.7 and Java 11 support
Date Thu, 20 Sep 2018 20:23:30 GMT
Hi Vladimir,

Do you know if update notifier can get and record java version from a node
and send it to Apache Ignite site? Or/And what is the most popular version
now?

I guess most existing users will continue to use their current Java, most
likely Java 8. And they will also require a huge amount of time to migrate.

Sincerely,
Dmitriy Pavlov

чт, 20 сент. 2018 г. в 23:00, Vladimir Ozerov <vozerov@gridgain.com>:

> Igniters, we have a problem.
>
> *TL;DR;*
> Ignite may be seriously broken in Java 11. This affects ignite.sh,
> Hibernate integration, JTA integration. And we cannot test it before code
> freeze due to Java 11 release schedule.
>
> We need to understand whether we shift release, or plan immediate AI 2.8
> afterwarвs, or ignore the problem until a number of user compliants appear.
>
> *Long story*
> As you may know we already put some efforts on Java 9 support in Ignite
> [1]. Specifically, during earlier releases we reworked all code affected by
> Java 9 changes and added several "--add-export" and "--add-module" flags to
> support some packages which are not accessible by default. We never
> implemented any modules in Ignite.
>
> As a result, currently Apache Ignite mostly works fine with Java 9. If node
> is started in standalone mode, we add mentioned flags to JVM arguments by
> default, and no actions are needed from user side. If node is started in
> embedded mode, user has to provide required flags manually [2]. This is
> acceptable state for us until module subsystem is integrated somehow with
> the product.
>
> But then we decided to perform extensive testing of current master on Java
> 9/10/11 versions. Thanks to Peter Ivanov, we setup required environment.
> During this activity we read more docs about Java 11. We revealed, that in
> this release a number of packages we depend on will be removed completely
> from JDK as a part of JEP 320 [3]. *JTA *and *Hibernate* integrations will
> stop work out of the box. Moreover, "--add-module" flag will stop working,
> what may affect ignite.sh.
>
> Things are even worse because Java 11 will be released exactly by our
> planned code freeze date, so we cannot even test it appropriately right
> now. So we need to revisit out Java 9+ support strategy for the nearest
> releases.
>
> *Possible solutions*
> 1) Relax and move Java 9+ support to AI 2.8 scope
> Pros: Java 8 will be supported till January 2019 [4] so we still have some
> time. We can plan AI 2.8 to Nov-Dec this year.
> Cons: more and more users will try Java 11 (not Java 9 or 10, they will be
> hidden from official page) during this time, and without Java 11 testing we
> may end up with not-working product.
>
> 2) Move AI 2.7 code freeze to the middle of October to have a time to test
> and fix big problems with Java 11.
> Pros: Java 11 will be released in the end of the next week [5]. We take
> some additional time to test us with Java 11, fix what can be fixed, find
> and document workaround for things which cannot be fixed.
> Cons: AI 2.7 will be released in the end of October.
>
> Another small "cons" for the second approach is that we will have more time
> for MVCC stabilization, and improve chances of service grid to be included
> into release (from what I heard from Nikolay and Vyacheslav, there is a
> good progress for now). But remember that our previous expirience with
> things like that is constantly shifting release dates.
>
> Please share your thoughts on what should we do with Java 11.
>
> Vladimir.
>
> [1] https://issues.apache.org/jira/browse/IGNITE-6728
> [2] https://issues.apache.org/jira/browse/IGNITE-9288
> [3] http://openjdk.java.net/jeps/320
> [4] https://www.oracle.com/technetwork/java/javase/eol-135779.html
> [5] http://www.java-countdown.xyz/
>

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