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From Xuefu Zhang <>
Subject Re: [DISCUSS] Supporting Hadoop-1 and experimental features
Date Sat, 16 May 2015 00:31:21 GMT
Just make sure that I understand the proposal correctly: we are going to
have two main branches, one for hadoop-1 and one for hadoop-2. New features
are only merged to branch-2. That essentially says we stop development for
hadoop-1, right? Are we also making two lines of releases: ene for branch-1
and one for branch-2? Won't that be confusing and also burdensome if we
release say 1.3, 2.0, 2.1, 1.4...

Please note that we will have hadoop 3 soon. What's the story there?


On Fri, May 15, 2015 at 4:43 PM, Vaibhav Gumashta <
> wrote:

>  +1 on the new branch. I think it’ll help in faster dev time for these
> important changes.
>  —Vaibhav
>   From: Alan Gates <>
> Reply-To: "" <>
> Date: Friday, May 15, 2015 at 4:11 PM
> To: "" <>
> Subject: Re: [DISCUSS] Supporting Hadoop-1 and experimental features
>  Anyone else have feedback on this?  If not I'll start a vote next week.
> Alan.
>    Gopal Vijayaraghavan <>
> May 14, 2015 at 10:44
>   Hi,
> +1 on the idea.
> Having a stable release branch with ongoing fixes where we do not drop
> major features would be good all around.
> It lets us accelerate the pace of development, drop major features or
> rewrite them entirely without dragging everyone else kicking & screaming
> into that release.
> Cheers,
> Gopal
>    Sergey Shelukhin <>
> May 11, 2015 at 19:17
>   That sounds like a good idea.
> Some features could be back ported to branch-1 if viable, but at least new
> stuff would not be burdened by Hadoop 1/MR code paths.
> Probably also a good place to enable vectorization and other perf features
> by default while we make alpha releases.
> +1
>    Alan Gates <>
> May 11, 2015 at 15:38
>   There is a lot of forward-looking work going on in various branches of
> Hive:  LLAP, the HBase metastore, and the work to drop the CLI.  It would
> be good to have a way to release this code to users so that they can
> experiment with it.  Releasing it will also provide feedback to developers.
> At the same time there are discussions on whether to keep supporting
> Hadoop-1.  The burden of supporting older, less used functionality such as
> Hadoop-1 is becoming ever harder as many new features are added.
> I propose that the best way to deal with this would be to make a
> branch-1.  We could continue to make new feature releases off of this
> branch (1.3, 1.4, etc.).  This branch would not drop old functionality.
> This provides stability and continuity for users and developers.
> We could then merge these new features branches (LLAP, HBase metastore,
> CLI drop) into the trunk, as well as turn on by default newer features such
> as the vectorization and ACID.  We could also drop older, less used
> features such as support for Hadoop-1 and MapReduce.  It will be a while
> before we are ready to make stable, production ready releases of this
> code.  But we could start making alpha quality releases soon.  We would
> call these releases 2.x, to stress the non-backward compatible changes such
> as dropping Hadoop-1.  This will give users a chance to play with the new
> code and developers a chance to get feedback.
> Thoughts?

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