It should work fine with Java 1.7. Mahout's presently at Lucene 4.6.x and Lucene versions >= 4.7 mandate JDK 1.7.
The reason we had not switched to Java 1.7 when we moved to the new T-Digest (post 0.9 release and back in March this year IIRC) was because of existing customers who could potentially be still on 1.6. We should switch to 1.7 and agree with all the points that Ted's called out earlier in this thread. On Wed, Aug 6, 2014 at 5:39 PM, Andrew Palumbo <ap....@outlook.com> wrote: > It does not require 1.7 to build. I've been running 1.6 as well. I did > compile m-1500. It builds fine with 1.6, but tests fail (only the h2o > module- as you said due to the h2o artifact being built w 1.7). My thinking > is that we don't want new Mahout users building with 1.6, having tests fail > and walking away. Can we release with failing tests (even if its 1.6 > specific)? > > As well if there were other issues with 1.6 holding us back, 1.6 is > getting old and there's no real drawbacks, maybe we should consider 1.7 as > an official version. Or as I said just make a quick fix on the building > from source page. > > > > > > Date: Wed, 6 Aug 2014 14:21:36 -0700 > > Subject: Re: Requiring Java 1.7 for Mahout > > From: dlie...@gmail.com > > To: dev@mahout.apache.org > > > > I am not sure if it actually would require 1.7 to build either, since my > > understanding dependencies are second-order and deeper, not immediate. > Did > > you try to compile it yet? > > > > > > On Wed, Aug 6, 2014 at 2:01 PM, Andrew Palumbo <ap....@outlook.com> > wrote: > > > > > also sorry- btw- I assuming 1500 will be merged.. > > > > > > > From: ap....@outlook.com > > > > To: dev@mahout.apache.org > > > > Subject: RE: Requiring Java 1.7 for Mahout > > > > Date: Wed, 6 Aug 2014 16:56:39 -0400 > > > > > > > > oracle? > > > > > > > > > Date: Wed, 6 Aug 2014 13:54:43 -0700 > > > > > Subject: Re: Requiring Java 1.7 for Mahout > > > > > From: dlie...@gmail.com > > > > > To: dev@mahout.apache.org > > > > > > > > > > or testing. > > > > > > > > > > > > > > > On Wed, Aug 6, 2014 at 1:54 PM, Dmitriy Lyubimov < > dlie...@gmail.com> > > > wrote: > > > > > > > > > > > My current java is 1.6.0_38, i have no problem building. > > > > > > > > > > > > > > > > > > On Wed, Aug 6, 2014 at 1:52 PM, Andrew Palumbo < > ap....@outlook.com> > > > wrote: > > > > > > > > > > > >> you're right- my big concern is that on our (probably outdated) > > > building > > > > > >> from source page we have 1.6 listed: > > > > > >> > > > > > >> http://mahout.apache.org/developers/buildingmahout.html > > > > > >> > > > > > >> The obvious simple fix here is to make the quick change on the > > > webpage to > > > > > >> 1.7 in order to build and test successfully. > > > > > >> > > > > > >> I do remember something about being limited to our current > lucene > > > version > > > > > >> though by 1.6 so i am wondering if this is may be a good time to > > > push or > > > > > >> require 1.7. > > > > > >> > > > > > >> Just checking our bases, so I'll drop it if there's no problem > here. > > > > > >> > > > > > >> Thanks > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > Date: Wed, 6 Aug 2014 13:33:19 -0700 > > > > > >> > Subject: Re: Requiring Java 1.7 for Mahout > > > > > >> > From: dlie...@gmail.com > > > > > >> > To: dev@mahout.apache.org > > > > > >> > > > > > > >> > the only problem is that we are not really requiring it. We > are > > > not > > > > > >> using > > > > > >> > anything of 1.7 functionality. If people compile (as i do) > > > Mahout, they > > > > > >> can > > > > > >> > compile any bytecode version they want. > > > > > >> > > > > > > >> > There are some 1.7 artifact dependencies in H20 but 1.7 would > be > > > > > >> required > > > > > >> > at run time only and only if the people are actually using > > > h2obindings > > > > > >> as > > > > > >> > dependency (which i expect majority would not care for). > > > > > >> > > > > > > >> > > > > > > >> > On Wed, Aug 6, 2014 at 1:28 PM, Andrew Palumbo < > > > ap....@outlook.com> > > > > > >> wrote: > > > > > >> > > > > > > >> > > As far as I can tell there should be no problems with > declaring > > > Java > > > > > >> 1.7 > > > > > >> > > as the official minimum Java version for building and > running > > > Mahout. > > > > > >> Are > > > > > >> > > there any objections to this or problems that I am missing? > > > > > >> > > > > > > > >> > > Andy > > > > > >> > > > > > > > >> > > > > > >> > > > > > > > > > > > > > > > > > > > > > > > >
