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Re: [DISCUSS] Cassandra and future Java


So for anyone that missed it, Java 11 will be released in September 2018.

I'd prefer we target one Java release only. This is purely because we don't
have the capacity or capability to test both releases. We hardly do a good
enough job as it is of testing and lumping another JVM into the mix is just
going to complicate things a lot and all the effort we expend into testing
both releases is probably better off just spent focusing on one.

At this point I don't think there is *much* value in supporting 11 for 4.0,
seeing as we won't be able to fully utilise features in 11 as our feature
freeze for 4.0 will occur before 11 is released. There is obviously the
support problem but adoptOpenJDK are claiming they'll support Java 8 until
September 2022 (https://adoptopenjdk.net/support.html) - which on top of
all the existing releases is probably good enough for us, and 2022 is far
enough away that hopefully 4.0 will be EOL'd by then. I don't think it's a
big risk that support for Java 8 will stop anytime soon, it's pretty
widespread and it's going to take people a *long* time to get off 8.

It would make much more sense to me to support 11 in 4.1 that way we can
actually utilise any benefits of 11.

On 29 May 2018 at 12:22, Robert Stupp <snazy@xxxxxxxx> wrote:

> Ideally, CI would run against both Java 8 and 11. I’ve no clue about b.a.o
> though.
>
> There will definitely be a log of smaller issues - both for OpenJDK 8 and
> 11.
> I think, it’s sufficient to deal with the Linux distros' (RH/deb) openjdk
> dependencies - just making sure, that we’re using the right Java version -
> and not let the package manger just pull the newest available.
> The version-string from adoptopenjdk for example is one of these “minor
> issues"...
>
> —
> Robert Stupp
> @snazy
>
> On 28. May 2018, at 15:46, Stefan Podkowinski <spod@xxxxxxxxxx> wrote:
>
> The main issue that I see, for supporting both Java 8 + 11, is testing.
> We should first decide how this would effect builds.apache.org, or how
> we're going to do CI testing in general for that situation.
>
> There are probably also smaller issues that we're not aware of yet, such
> as which Java dependency to use for our deb and rpm packages,
> differences in Java distributions (Oracle, AdoptOpenJDK, Redhat,..) and
> so on. I'd expect we could deal with this on the Java side, but the
> infra, scripting and testing implications give me a greater headache
> when thinking of it.
>
>
> On 25.05.2018 15:33, J. D. Jordan wrote:
>
> +1 for “Option 3: both 8 + 11” it shouldn’t be too hard to maintain code
> wise, and leaves people’s options open.
>
> -Jeremiah
>
> On May 25, 2018, at 6:31 AM, Robert Stupp <snazy@xxxxxxxx> wrote:
>
> I'd like to bring up the C*/Java discussion again. It's been a while since
> we've discussed this.
>
> To me it sounds like there's still the question about which version(s) of
> Java we want to support beginning with C* 4.0.
>
> I assume, that it's legit (and probably very necessary) to assume that
> OpenJDK is now (i.e. after Java 6) considered as "production ready" for C*.
> The public (and legal and free) availability of Oracle's Java 8 will end in
> January 2019 (unless you're using it privately on your desktop). Java 9 and
> 10 are not a thing, as both will be EOL when the C* 4.0 branch is about to
> be cut. The most recent available Java version will be 11, which is meant
> to be publicly available from Oracle until March 2019 and should get LTS
> support for OpenJDK 11 from major Linux distros (RHEL and derivates,
> Ubuntu, Azul Zulu).
>
> (Side note: adoptopenjdk is different here, because it does not include
> the patch version in the version banner (java.version=1.8.0-adoptopenjdk),
> so difficult to check the minimum patch version on startup of C*.)
>
> (Attn, rant: I'm not particularly happy with the new release and support
> model for Java, because developing something now, that's about to release
> end of the year on a Java version that has not even reached
> feature-complete status, is, gently speaking, difficult. But sticking to an
> "antique" Java version (8) has its own risks as well.)
>
> I'm silently ignoring any Java release, that's not aimed to get any
> LTS(-ish?) support from anybody - so only Java 8 + 11 remain.
>
> There are generally three (IMO legit) options here: only support Java 8,
> only support Java 11, support both Java 8 and Java 11. All three options
> have a bunch of pros and cons.
>
> Option 1, only Java 8: Probably the safest option. Considering the
> potential lifetimes of Java 8 and C* 4.0, even the most enthusiastic
> maintainers may stop backporting security or bug fixes to OpenJDK 8. It
> might not be an issue in practice, but if there's for example a severe
> issue in the SSL/TLS area and nobody fixes it in 8, well, good luck.
>
> Option 2, only Java 11: The option with the most risks IMO. Java 11 is not
> even feature complete, and there a bunch of big projects that still may
> make it into 11 (think: Valhalla). There's no guarantee whether the C* code
> or any included library will actually work with Java 11 (think: if it works
> now, it may not work with the final Java version). However, it leaves the
> door wide open for all the neat and geeky things in Java 11.
>
> Option 3: both 8 + 11: The idea here is to default to Java 8, but the code
> also runs on 11. It leaves the option to benefit from optimizations that
> are only available on 11 while maintaining the known stability of 8.
> Initially, only the combination of C* 4.0 + Java 8 would be labeled as
> "stable" and the combination of C* 4.0 + Java 11 as "experimental". But it
> gives us time to "evaluate" 4.0 on 11. When we have enough experience with
> 11, C* on 11 can be labeled as "stable" as well. The downside of this
> "hybrid" is, that it's a bit more difficult to introduce features, that
> depend on 11.
>
> I think, 3) gives the best of both worlds: stability of 8 and an upgrade
> path to 11 in the future, that people can actually test with C* 4.0. Happy
> to make the patch for #9608 ready for option 3. But it would be great to
> get a consensus here for either option before we review #9608 and commit it.
>
> Another proposal, for both options 1+3: Raise the minimum supported
> version of 8 for C* 4.0 to something more recent than 8u40, which is quite
> from the stone-age. It could be 8u171 or whatever will be recent in autumn.
>
> Robert
>
> --
> Robert Stupp
> @snazy
>
>
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