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From: Christopher <ctubbsii@apache.org>
Date: Fri, 06 May 2016 03:43:07 +0000
Message-ID: <CAL5zq9bRQmw+KWqoDDeR7ww2WiphQgQVo0qN7QOd=_Tzr7T+TA@mail.gmail.com>
Subject: Re: [DISCUSS] Java 8 support (was Fwd: [jira] [Commented]
 (ACCUMULO-4177) TinyLFU-based BlockCache)
To: dev@accumulo.apache.org
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archived-at: Fri, 06 May 2016 03:43:21 -0000

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Another interesting point... didn't realize until actually doing it:
bumping to JDK8 *requires* a bump in the major version, because modernizer
will block on some incompatible API changes in Mock, which is already
deprecated. (Unless we're okay with disabling modernizer... which I guess
is an acceptable solution... but it makes me unhappy :) )

On Thu, May 5, 2016 at 11:39 PM Josh Elser <josh.elser@gmail.com> wrote:

> Thanks boss. I figured you'd have my back :)
> On May 5, 2016 9:43 PM, "Christopher" <ctubbsii@apache.org> wrote:
>
> > Already pushed. Initially forgot about modernizer, but I'm working
> through
> > it now.
> >
> > On Thu, May 5, 2016 at 7:25 PM Josh Elser <josh.elser@gmail.com> wrote:
> >
> > > Sounds good!
> > >
> > > I had tried to switch master to jdk8 as well, but ran into modernizer
> > > plugin issues. I've since been on a call, so I haven't been able to
> push
> > > that update. I'll get to it when I can, but perhaps someone has beaten
> > > me to it already.
> > >
> > > Christopher wrote:
> > > > Okay, so if we're okay treating the master branch as a 2.0
> development
> > > > branch, then I'm going to go ahead and start focusing on some 2.0
> > tickets
> > > > that may involve refactoring which have breaking changes that I've
> been
> > > > reluctant to do before without an explicit 2.0 development branch. Of
> > > > course, none of this says we have to stop development on 1.x stuffs,
> or
> > > > says anything about when we'll release a 2.0, but it'd be nice to
> have
> > a
> > > > place to start putting in stuff for an eventual 2.0.
> > > >
> > > > On Thu, May 5, 2016 at 11:07 AM Josh Elser<josh.elser@gmail.com>
> > wrote:
> > > >
> > > >> Ok, looks to me that we are in agreement now and don't need a vote.
> > > >>
> > > >> I will create a 1.8 branch today (updating Jenkins appropriately) so
> > we
> > > >> can get master in a state that would be ready for the changes in
> 4177.
> > > >>
> > > >> Keith Turner wrote:
> > > >>> On Tue, May 3, 2016 at 4:54 PM, Christopher<ctubbsii@apache.org>
> > >  wrote:
> > > >>>
> > > >>>> I think I'd prefer leaving 1.8 as it stands, with the expectation
> to
> > > >> have a
> > > >>>> release line of 1.8 which only requires Java 7.
> > > >>>>
> > > >>> +1
> > > >>>
> > > >>> I can not see any reason to switch to JDK8 before releasing 1.8...
> > > >> assuming
> > > >>> thats going to happen soonish
> > > >>>
> > > >>>
> > > >>>> We can create a 2.0 branch, which bumps the Java version, and can
> > > accept
> > > >>>> changes which require Java 8 or API-breaking changes (as per
> semver)
> > > for
> > > >>>> the next major release line after 1.8.
> > > >>>>
> > > >>>> That would put us on a solid roadmap for 2.0 without disrupting
> 1.8
> > > >>>> development, which is probably already nearing release readiness.
> > > >>>>
> > > >>>> On Tue, May 3, 2016 at 4:33 PM Josh Elser<josh.elser@gmail.com>
> > >  wrote:
> > > >>>>
> > > >>>>> Gotcha. Thanks for clarifying, Mike -- I'm inclined to agree with
> > > you.
> > > >> I
> > > >>>>> can't think of a reason why we would upgrade to Java8 and not
> make
> > > use
> > > >>>>> of it in some way (publicly or privately).
> > > >>>>>
> > > >>>>> That being said, I don't think I see consensus. How about we
> > regroup
> > > in
> > > >>>>> the form of a vote? (normal semver rules are an invariant -- no
> > > changes
> > > >>>>> to our public API compatibility rules are implied by the below)
> > > >>>>>
> > > >>>>> * Call the current 1.8.0-SNAPSHOT (master) "2.0.0-SNAPSHOT" and
> > move
> > > to
> > > >>>>> jdk8
> > > >>>>> * Branch 1.8, make master 2.0.0-SNAPSHOT. 1.8 stays jdk7, 2.0
> goes
> > > jdk8
> > > >>>>>
> > > >>>>> Please chime in if I missed another option or am calling
> discussion
> > > too
> > > >>>>> soon. It just seems like we might have veered off-track and I
> don't
> > > >> want
> > > >>>>> this to fall to the wayside (again) without decision.
> > > >>>>>
> > > >>>>> Mike Drob wrote:
> > > >>>>>> If our code ends up using java 8 bytecode in any classes
> required
> > > by a
> > > >>>>>> consumer, then I think they will get compilation (linking?)
> > errors,
> > > >>>>>> regardless of java 8 types in our methods signatures.
> > > >>>>>>
> > > >>>>>> On Tue, May 3, 2016 at 3:09 PM, Josh Elser<josh.elser@gmail.com
> >
> > > >>>> wrote:
> > > >>>>>>> That's a new assertion ("we can't actually use Java 8 features
> > util
> > > >>>>>>> Accumulo-2"), isn't it? We could use new Java 8 features
> > internally
> > > >>>>> which
> > > >>>>>>> would require a minimum of Java 8 and not affect the public
> API.
> > > >> These
> > > >>>>> are
> > > >>>>>>> related, not mutally exclusive, IMO.
> > > >>>>>>>
> > > >>>>>>> To Shawn's point: introducing Java 8 types/APIs was exactly the
> > > point
> > > >>>> --
> > > >>>>>>> we got here from ACCUMULO-4177 which does exactly that.
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>> Mike Drob wrote:
> > > >>>>>>>
> > > >>>>>>>> I agree with Shawn's implied statement -- why bother dropping
> > > Java 7
> > > >>>> in
> > > >>>>>>>> any
> > > >>>>>>>> Accumulo 1.x if we can't actually make use of Java 8
> > > features.until
> > > >>>>>>>> Accumulo 2.0
> > > >>>>>>>>
> > > >>>>>>>> On Tue, May 3, 2016 at 1:29 PM, Christopher<
> ctubbsii@apache.org
> > >
> > > >>>>>    wrote:
> > > >>>>>>>> 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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