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From Christopher <ctubb...@apache.org>
Subject Re: [DISCUSS] Java 8 support (was Fwd: [jira] [Commented] (ACCUMULO-4177) TinyLFU-based BlockCache)
Date Tue, 03 May 2016 18:29:00 GMT
Right, these are competing and mutually exclusive goals, so we need to
decide which is a priority and on what timeline we should transition to
Java 8 to support those goals.

On Tue, May 3, 2016 at 9:16 AM Shawn Walker <accumulo@shawn-walker.net>
wrote:

> I'm not sure that guaranteeing build-ability under Java 7 would address the
> issue that raised this discussion:  We (might) want to add a dependency
> which requires Java 8.  Or, following Keith's comment, we might wish to
> introduce Java 8 types (e.g. CompletableFuture<T>) into Accumulo's "public"
> API.
>
>
>
> On Mon, May 2, 2016 at 6:42 PM, Christopher <ctubbsii@apache.org> wrote:
>
> > I don't feel strongly about this, but I was kind of thinking that we'd
> bump
> > to Java 8 dependency (opportunistically) when we were ready to develop a
> > 2.0 version. But, I'm not opposed to doing it on the 1.8 branch.
> >
> > On Mon, May 2, 2016 at 2:50 PM William Slacum <wslacum@gmail.com> wrote:
> >
> > > So my point about versioning WRT to the Java runtime is more about how
> > > there are incompatibilities within the granularity of Java versions we
> > talk
> > > about (I'm specifically referencing a Kerberos incompatibility within
> > > versions of Java 7), so I think that just blanket saying "We support
> > Java X
> > > or Y" really isn't enough. I personally feel some kind of version bump
> is
> > > nice to say that something has changed, but until the public API starts
> > > exposing Java 8 features, it's a total cop out to say, "Here's all
> these
> > > bug fixes and some new features, oh by the way upgrade your
> > infrastructure
> > > because we decided to use a new Java version for an optional feature".
> > >
> > > The best parallel I can think of is in Scala, where there's no binary
> > > compatibility between minor versions (ie, 2.10, 2.11,etc), so there's
> > > generally an extra qualifier on libraries marking the scala compability
> > > level. Would we ever want to have accumulo-server-1.7-j[7|8]  styled
> > > artifacts to signal some general JRE compatibility? It's a total mess,
> > but
> > > I haven't seen a better solution.
> > >
> > > Another idea is we could potentially have some guarantee for Java 7,
> such
> > > as making sure we can build a distribution using Java 7, but only
> > > distribute Java 8 artifacts by default?
> > >
> > > On Mon, May 2, 2016 at 2:30 PM, Josh Elser <josh.elser@gmail.com>
> wrote:
> > >
> > > > Sean Busbey wrote:
> > > >
> > > >> On Mon, May 2, 2016 at 8:55 AM, Josh Elser<josh.elser@gmail.com>
> > > wrote:
> > > >>
> > > >>> >  Thanks for the input, Sean.
> > > >>> >
> > > >>> >  Playing devil's advocate: we didn't have a major version
bump
> when
> > > we
> > > >>> >  dropped JDK6 support (in Accumulo-1.7.0). Oracle has EOL'ed
> java 7
> > > >>> back in
> > > >>> >  April  2015. Was the 6->7 upgrade different than a 7->8
upgrade?
> > > >>> >
> > > >>>
> > > >>
> > > >> On Mon, May 2, 2016 at 10:31 AM, Keith Turner<keith@deenlo.com>
> > wrote:
> > > >>
> > > >>> >  On Mon, May 2, 2016 at 1:54 AM, Sean Busbey<busbey@cloudera.com
> >
> > > >>> wrote:
> > > >>> >
> > > >>>
> > > >>>> >>  If we drop jdk7 support, I would strongly prefer
a major
> version
> > > >>>> bump.
> > > >>>> >>
> > > >>>>
> > > >>> >
> > > >>> >
> > > >>> >  Whats the rationale for binding a bump to Accumulo 2.0 with
a
> bump
> > > in
> > > >>> the
> > > >>> >  JDK version?
> > > >>> >
> > > >>>
> > > >>
> > > >> The decision to drop JDK6 support happened in latemarch  /
> earlyApril
> > > >> 2014[1], long before any of our discussions or decisions on semver.
> > > >> AFAICT it didn't get discussed again, presumably because by the time
> > > >> we got to 1.7.0 RCs it was too far in the past.
> > > >>
> > > >
> > > > Thanks for the correction, Sean. I hadn't dug around closely enough.
> > > >
> > >
> >
>

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