I think this could be done by some module tricks, where we build a special
module with -source 8 and -target 8.We have done similar things in the past
to have hadoop1-compat and hadoop2-compact.

Let me have a try.

Sean Busbey <bus...@apache.org> 于2022年2月16日周三 13:31写道:

> Unfortunately if we want to keep jdk8 working we can't rely on building
> with the jdk release target option on newer jdks.
>
> We ran into this recently in HBASE-25465 where a JDK bug came up.
>
> On Tue, Feb 15, 2022 at 8:12 PM 张铎(Duo Zhang) <palomino...@gmail.com>
> wrote:
>
> > +1 on moving the minimum required java version for compiling HBase to
> Java
> > 11. But we could still use --release=8 to still support jdk8 at runtime.
> >
> > Java 8 is still widely used, and I believe this will last for even more
> > years, as lots of big companies such as RedHat, Microsoft and Amazon are
> > still shipping new jdk8 releases, I do not think it is time to fully drop
> > the support of jdk8.
> >
> > Thanks.
> >
> > Sean Busbey <bus...@apache.org> 于2022年2月16日周三 09:57写道:
> >
> > > If we set the minJDK to 11 I believe that will effectively remove jdk8
> > > support, rather than "just" deprecate it.
> > >
> > > As we build out more robust testing I would be in favor of running less
> > of
> > > it on deprecated JDKs.
> > >
> > >
> > > On Tue, Feb 15, 2022, 16:10 Josh Elser <els...@apache.org> wrote:
> > >
> > > > Deprecating jdk8 for HBase 3 and requiring minJdk=11 seems reasonable
> > to
> > > > me.
> > > >
> > > > Gotta start pushing the issue somehow.
> > > >
> > > > On 2/15/22 1:47 PM, Sean Busbey wrote:
> > > > > Hi folks!
> > > > >
> > > > > It's been some time since we decided to stick to LTS JDK releases
> as
> > a
> > > > way
> > > > > of getting a handle on the JDK treadmill.
> > > > >
> > > > > What do folks think about deprecating JDK8? The openjdk8u project
> is
> > > > still
> > > > > going and there are commercial support options at least through
> 2030.
> > > > >
> > > > > Deprecating it in HBase 3 would mean we could remove it in HBase 4,
> > not
> > > > > that we would _have_ to remove it. The way I think about likely
> > timing
> > > of
> > > > > these events goes like this:
> > > > >
> > > > > * HBase 2 started alphas in June 2017, betas in January 2018, and
> > came
> > > > out
> > > > > in April 2018
> > > > > * HBase 3 started alphas in July 2021, and as of Feb 2022 we
> haven't
> > > > > discussed how close we are to our stated beta goals (upgrades from
> > > active
> > > > > 2.x releases and removal of not-ready features).
> > > > >
> > > > > Given the above, in the absence of us specifically pushing to roll
> > > > through
> > > > > major version numbers for some reason, I think a reasonably
> > > conservative
> > > > > estimate is for HBase 3 to arrive in late 2022 or early 2023 and
> then
> > > > HBase
> > > > > 4 to start alphas in ~2025. An HBase 5 prior to 2030 seems
> unlikely.
> > > > >
> > > > > That all said, our current reference guide section on java versions
> > > does
> > > > > not sound very confident about JDK11 support.
> > > > >
> > > > >> A Note on JDK11 *
> > > > >> Preliminary support for JDK11 is introduced with HBase 2.3.0. This
> > > > > support is limited to
> > > > >> compilation and running the full test suite. There are open
> > questions
> > > > > regarding the runtime
> > > > >> compatibility of JDK11 with Apache ZooKeeper and Apache Hadoop
> > > > > (HADOOP-15338).
> > > > >> Significantly, neither project has yet released a version with
> > > explicit
> > > > > runtime support for
> > > > >> JDK11. The remaining known issues in HBase are catalogued in
> > > > HBASE-22972.
> > > > >>
> > > > >
> > > > > Since that blurb was written, Hadoop has added JDK11 support [1] as
> > has
> > > > > ZooKeeper[2]. As a part of buttoning up our JDK11 support we could
> > > update
> > > > > our minimum supported versions of these projects to match that
> > support.
> > > > >
> > > > > What do folks think?
> > > > >
> > > > > [1]: https://hadoop.apache.org/docs/r3.3.0/index.html
> > > > > [2]:
> > > > >
> > >
> https://zookeeper.apache.org/doc/r3.6.0/zookeeperAdmin.html#sc_systemReq
> > > > >
> > > >
> > >
> >
>

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