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From: Alejandro Abdelnur <tucu@cloudera.com>
Date: Wed, 25 Jun 2014 15:12:50 -0700
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Subject: Re: Moving to JDK7, JDK8 and new major releases
To: "common-dev@hadoop.apache.org" <common-dev@hadoop.apache.org>
Cc: "yarn-dev@hadoop.apache.org" <yarn-dev@hadoop.apache.org>,
	"mapreduce-dev@hadoop.apache.org" <mapreduce-dev@hadoop.apache.org>,
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Chris,

Compiling with jdk7 and doing javac -target 1.6 is not sufficient, you are
still using jdk7 libraries and you could use new APIs, thus breaking jdk6
both at compile and runtime.

you need to compile with jdk6 to ensure you are not running into that
scenario. that is why i was suggesting the nightly jdk6 build/test jenkins
job.


On Wed, Jun 25, 2014 at 2:04 PM, Chris Nauroth <cnauroth@hortonworks.com>
wrote:

> I'm also +1 for getting us to JDK7 within the 2.x line after reading the
> proposals and catching up on the discussion in this thread.
>
> Has anyone yet considered how to coordinate this change with downstream
> projects?  Would we request downstream projects to upgrade to JDK7 first
> before we make the move?  Would we switch to JDK7, but run javac -target
> 1.6 to maintain compatibility for downstream projects during an interim
> period?
>
> Chris Nauroth
> Hortonworks
> http://hortonworks.com/
>
>
>
> On Wed, Jun 25, 2014 at 9:48 AM, Owen O'Malley <omalley@apache.org> wrote:
>
> > On Tue, Jun 24, 2014 at 4:44 PM, Alejandro Abdelnur <tucu@cloudera.com>
> > wrote:
> >
> > > After reading this thread and thinking a bit about it, I think it
> should
> > be
> > > OK such move up to JDK7 in Hadoop
> >
> >
> > I agree with Alejandro. Changing minimum JDKs is not an incompatible
> change
> > and is fine in the 2 branch. (Although I think it is would *not* be
> > appropriate for a patch release.) Of course we need to do it with
> > forethought and testing, but moving off of JDK 6, which is EOL'ed is a
> good
> > thing. Moving to Java 8 as a minimum seems much too aggressive and I
> would
> > push back on that.
> >
> > I'm also think that we need to let the dust settle on the Hadoop 2 line
> for
> > a while before we talk about Hadoop 3. It seems that it has only been in
> > the last 6 months that Hadoop 2 adoption has reached the main stream
> users.
> > Our user community needs time to digest the changes in Hadoop 2.x before
> we
> > fracture the community by starting to discuss Hadoop 3 releases.
> >
> > .. Owen
> >
>
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-- 
Alejandro

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