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From Daniel Dai <da...@hortonworks.com>
Subject Re: [Discussion] Keep or revert PIG-3419 in trunk?
Date Mon, 07 Oct 2013 21:49:08 GMT
Let me first revert PIG-3457, that complicates things. I will try to
explore for a solution in next the few days. But if we cannot settle
quickly, I would suggest to revert PIG-3419 on trunk first, and redo it
later in a better way. Otherwise, it will be very hard to revert.


On Mon, Oct 7, 2013 at 12:05 PM, Cheolsoo Park <piaozhexiu@gmail.com> wrote:

> Hi devs,
> This is a follow-up discussion about how to resolve the backward
> incompatibility of PIG-3419 (Pluggable execution engine). Per the previous
> discussion <http://search-hadoop.com/m/wYz6hz9CoE>, I reverted it in 0.12
> but kept it in trunk. As we keep committing more changes into trunk, it
> gets harder to back out PIG-3419 cleanly. So I suggest we should make a
> decision sooner rather than later.
> The crux of the problem is as follows:
> PIG-3419 removes all the MR-specific things from JobStats. However,
> PigRunner and PigServer returns PigStats that in turn exposes JobStats to
> end users. So changing JobStats breaks backward compatibility for
> downstream projects such as Oozie. While changing the semantics of JobStats
> is acceptable, we must provide a deprecation path so that end users can
> upgrade their applications smoothly.
> Proposed solutions:
> 1) Provide backward compatibility in source code: Maybe possible, but no
> one has come up with a clean solution. For eg, I failed. :(
> 2) Publish two jars: We keep PIG-3419 only in tez-branch and publish two
> jars (one for old API and one for new API) for a couple of future releases.
> If we do this, we're going to revert PIG-3419 in trunk.
> What do you think?
> Thanks,
> Cheolsoo

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