On Wed, Dec 02, 2015 at 04:28PM, Amos B. Elberg wrote:
> Konstantin thank you for getting into this. 
> 
>> The best way to go around it is by 
>> providing a build-time option that will pull such binaries in. But by 
>> default 
>> such libs shouldn't be pulled. 
>
> That is basically how the PR handles this. If the GPL’d interpreter scripts
> are missing, there’s no indication at all at build time.  It doesn’t try to
> download them. 
> 
> At runtime, if the user tries to use functionality that would need such a
> script (i.e., if they type “knitr” to use knitr), we display an error that
> says that the functionality is not there because the library is missing, and
> that the library cannot be provided because it has an incompatible license,
> but the user can download it themselves if they want.
> 
> And, in the log, if the logging level is high, they will see a note that
> some functionality was disabled because the libraries weren’t there.
> 
> To be clear, though, none of these libraries are binaries.  They’re all 
> interpreter scripts. 

If you ever in a doubt of which licenses could be used for dependncies (not to
say about source code) are listed in Category A list of [1]

A lot of quesitons discussed here are already covered in the legal FAQ, so
just check against it if you have any questions.

[1] http://www.apache.org/legal/resolved.html#category-a

Cos

> From: Konstantin Boudnik <[email protected]>
> Reply: [email protected] <[email protected]>, 
> [email protected] <[email protected]>
> Date: December 2, 2015 at 3:24:50 PM
> To: [email protected] <[email protected]>
> Subject:  Re: License of KnitRInterpreter Was: Re: contributions impasse. 
> Was: [GitHub] incubator-zeppelin pull request: R Interpreter for Zeppelin  
> 
> On Wed, Dec 02, 2015 at 06:56PM, Corneau Damien wrote:  
> > I think that what moon means is that:  
> > If we merge the way it is now, the KnitRInterpreter will be part of the  
> > code base, so it isn't optional at code base level.  
> >  
> > To make it even more simple:  
> > * If the code has the right licensing -> that code can be part of the  
> > source code, and can be including in a binary release  
> 
> We aren't concerned with binary releases - as an Apache community we are  
> voting and releasing source code. If the project wants to provide a binary  
> release to its users, they are better be warned about inclusion of non  
> ASL2-friendly licensed bits.  
> 
> > * If the code doesn't have the right licensing -> it can't be part of the  
> > source code, and can't be included in a binary release  
> 
> See above.  
> 
> > * If the code doesn't have the right licensing but is imported at build  
> > time (libraries for example) -> it is not in the source code, it can't be  
> > included in binary release  
> 
> That is unless a user doing it on his own. The best way to go around it is by 
>  
> providing a build-time option that will pull such binaries in. But by default 
>  
> such libs shouldn't be pulled.  
> 
> Cos  
> 
> > So in the case of licensing issues, it would need to be fully optional  
> > (user bring the interpreter in his directory and build Zeppelin with it)  
> >  
> >  
> > On Wed, Dec 2, 2015 at 6:33 PM, Amos B. Elberg <[email protected]>  
> > wrote:  
> >  
> > > Moon let me clarify:  
> > >  
> > > Interpreted code doesn’t “link.” The wiki article actually explains it  
> > > pretty well — https://en.wikipedia.org/wiki/GPL_linking_exception  
> > > “Linking” against a library means compiling its headers into a binary, 
> > > the  
> > > way a C compiler works. The 2008 e-mail Moon distributed, called this the 
> > >  
> > > “interpreter exception.”  
> > >  
> > > As for whether GPL’d code is a “mandatory dependency,” if knitr is 
> > > missing  
> > > the PR will compile, run and test just fine. The user is never prompted 
> > > to  
> > > download it. The only effect is, if the user types “knitr” and knitr 
> > > isn’t  
> > > there, we display an InterpreterError that knitr isn’t there.  
> > >  
> > > KnitRInterpreter is not optionally required. so it does not matter KnitR  
> > > is  
> > > optionally required or not.  
> > > Aren’t all interpreters optional? You can turn them on and off in the  
> > > config files.  
> > >  
> > > Do you mean that the KnitRInterpreter class gets compiled to bytecode 
> > > even  
> > > if knitr is missing? So what? That isn't a mandatory dependency or a 
> > > link.  
> > >  
> > > From: moon soo Lee <[email protected]>  
> > > Reply: [email protected] <  
> > > [email protected]>  
> > > Date: December 2, 2015 at 3:18:00 AM  
> > > To: [email protected] <[email protected]> 
> > >  
> > > Subject: Re: License of KnitRInterpreter Was: Re: contributions impasse.  
> > > Was: [GitHub] incubator-zeppelin pull request: R Interpreter for Zeppelin 
> > >  
> > >  
> > > Let me summarize license concern about KnitRInterpreter.  
> > >  
> > >  
> > > Amos's interpretation.  
> > >  
> > > KnitR is optionally required by KnitRInterpreter.  
> > > R dependency in SparkR has no problem. So KnitR should be the same.  
> > >  
> > >  
> > > Moon's interpretation.  
> > >  
> > > KnitRInterpreter is not optionally required. so it does not matter KnitR 
> > > is  
> > > optionally required or not.  
> > > R dependency in SparkR is exception of GPL. KnitR is not applied that  
> > > exception.  
> > >  
> > >  
> > > Amos, could you confirm my understanding to your interpretation is 
> > > correct?  
> > > If it is not could you clarify it?  
> > >  
> > > Thanks,  
> > > moon  
> > >  
> > > On Wed, Dec 2, 2015 at 10:34 AM Amos B. Elberg <[email protected]>  
> > > wrote:  
> > >  
> > > > Just to put the final nail in this, I looked it up.  
> > > >  
> > > > I see no evidence of any “compiler exception.”  
> > > >  
> > > > There is an exception in the license for the runtime libraries that are 
> > > >  
> > > > bundled with GCC. See:  
> > > > http://www.gnu.org/licenses/gcc-exception-3.1-faq.html  
> > > >  
> > > > But no “compiler exception.”  
> > > >  
> > > > In fact, I believe this is part of the reason why LLVM was created.  
> > > >  
> > > > From: moon soo Lee <[email protected]>  
> > > > Reply: moon soo Lee <[email protected]>  
> > > > Date: December 1, 2015 at 8:16:36 PM  
> > > > To: Amos B. Elberg <[email protected]>,  
> > > > [email protected] <[email protected]>  
> > > > Subject: Re: contributions impasse. Was: [GitHub] incubator-zeppelin 
> > > > pull  
> > > > request: R Interpreter for Zeppelin  
> > > >  
> > > > Is knitR is commonly considered as a interpreter/compiler? or is it  
> > > > considered as a library routine?  
> > > >  
> > > > Thanks,  
> > > > moon  
> > > >  
> > > > On Wed, Dec 2, 2015 at 10:12 AM Amos B. Elberg <[email protected]>  
> > > > wrote:  
> > > > Moon - you give this as an explanation of the licensing issue:  
> > > > https://stat.ethz.ch/pipermail/r-help/2008-July/169332.html  
> > > >  
> > > > According to that, there is an exception in the GPL for interpreter  
> > > > languages. As long as you don’t distribute the code, its fine to talk 
> > > > to  
> > > > an interpreted language.  
> > > >  
> > > > Well, if that’s the case, then the PR plainly does not have a license  
> > > > issue. It doesn’t distribute any GPL’d R code.  
> > > >  
> > > > I’m not sure what’s confusing about this. It seems completely  
> > > > straightforward.  
> > > >  
> > > > Regarding this:  
> > > >  
> > > >  
> > > > --  
> > > > Amos Elberg  
> > > > Sent with Airmail  
> > > >  
> > > > From: moon soo Lee <[email protected]>  
> > > > Reply: [email protected] <  
> > > > [email protected]>  
> > > > Date: December 1, 2015 at 6:48:47 PM  
> > > >  
> > > > To: [email protected] 
> > > > <[email protected]  
> > > >  
> > > > Subject: Re: contributions impasse. Was: [GitHub] incubator-zeppelin 
> > > > pull  
> > > > request: R Interpreter for Zeppelin  
> > > >  
> > > > On Wed, Dec 2, 2015 at 1:09 AM Amos B. Elberg <[email protected]>  
> > > > wrote:  
> > > >  
> > > > > I am going to try to minimize my reaction to Moon’s e-mail.  
> > > > >  
> > > > > The tl;dr is this:  
> > > > >  
> > > > > The reason we are having this discussion now is that active users of  
> > > the  
> > > > > PR — which now has its own user base — went public to complain about  
> > > > this.  
> > > >  
> > > >  
> > > > > The PR has been tested by an active user base for more than three  
> > > months.  
> > > > > No-one has been able to identify any specific actual licensing 
> > > > > problem,  
> > > > and  
> > > > > the PR was prepared based on an extensive, careful review of the  
> > > relevant  
> > > > > licensing issues and after contacting the relevant people.  
> > > > >  
> > > > >  
> > > >  
> > > > I admire every software that used by user and helping people. That  
> > > includes  
> > > > your work. But that's not the topic we're in discussion. Active user 
> > > > does  
> > > > not mean your contribution can ignore the review.  
> > > >  
> > > >  
> > > >  
> > > > > It is not an explanation for someone who has been ignoring my “how 
> > > > > can  
> > > I  
> > > > > move this forward…” emails for three months to point the finger and  
> > > say I  
> > > > > didn’t contact the right person or file the right report.  
> > > > >  
> > > > >  
> > > > This is also not the topic in this discussion.  
> > > >  
> > > >  
> > > > > The burden for providing an explanation for the inaction is on the 
> > > > > PMCC  
> > > > at  
> > > > > this point.  
> > > >  
> > > > I'm sorry, but the other PRs are passing CI. If it's problem on 
> > > > Zeppelin  
> > > > > core, why do you think other PRs are passing CI?  
> > > > > They’re not! I often see comments on PRs to just ignore that CI is  
> > > > > failing.  
> > > > >  
> > > > > One of the most common reasons this PR fails CI, is CI times-out  
> > > > > downloading Spark to install. How could that possibly be caused by 
> > > > > the  
> > > > PR?  
> > > > >  
> > > > > It looks to me like the only PRs with changes to the relevant parts 
> > > > > of  
> > > > the  
> > > > > code — the SparkInterpreter — are being made by the person who wrote  
> > > the  
> > > > > testing suite.  
> > > > >  
> > > > > So, that would explain why some other PRs pass CI: Neither the  
> > > > > SparkInterpreter nor the testing suite are stable or robust, but 
> > > > > since  
> > > > the  
> > > > > PRs are coming from the person who wrote both…  
> > > > >  
> > > > > And let's say Zeppelin core has problem and that makes your PR fails 
> > > > > on  
> > > > CI  
> > > > > test. That's possible. But it still does not mean we can merge it 
> > > > > with  
> > > CI  
> > > > > failing.  
> > > > >  
> > > > > It means you should be working with me to figure out why the CI is  
> > > > failing.  
> > > > >  
> > > > > This PR has been tested by an active user base for the past three  
> > > months.  
> > > > > If CI is continuing to fail, and dozens of hours of effort have not  
> > > > > resolved the CI issues, then it is time to start considering whether  
> > > the  
> > > > > testing suite is part of the problem.  
> > > > >  
> > > > > The level of defensiveness about the CI and SparkInterpreter is not  
> > > > > helping to resolve these issues.  
> > > > >  
> > > > > If you think it's problem on Zeppelin core, then file an issue that  
> > > > > reproduce the problem on Zeppelin core, that might be more efficient  
> > > than  
> > > > > keep trying yourself.  
> > > > > I contacted you numerous times about such issues...  
> > > > >  
> > > >  
> > > >  
> > > > I remember i commented your issue about CI. but you just keep repeated  
> > > it's  
> > > > not your problem but Zeppelin core problem.  
> > > >  
> > > > Then please file an issue about the problem you found in Zeppelin Core. 
> > > >  
> > > > Then everyone will get into the problem.  
> > > >  
> > > >  
> > > >  
> > > > >  
> > > > > In my interpretation, KnitRInterpreter is not an optional feature 
> > > > > while  
> > > > it  
> > > > > is always enabled when compiling Zeppelin and always enabled when  
> > > running  
> > > > > Zeppelin. And it requires dynamically linked GPL library on runtime.  
> > > (yes  
> > > > > it will fail when no KnitR is installed on the system)  
> > > > >  
> > > > > Its not always enabled.  
> > > > > It is not dynamically linked at runtime.  
> > > > > It will not fail when knitr is missing. If knitr is not present, the  
> > > repl  
> > > > > interpreter starts and a note is written to to the log that the knitr 
> > > > >  
> > > > > interpreter isn’t available because knitr is not present.  
> > > > >  
> > > > > no Apache code can ever call a shell script, on the purpose of 
> > > > > dynamic  
> > > > > linking with GPL library.  
> > > > > You misunderstand.  
> > > > >  
> > > > > The *shell* is GPL'd.  
> > > > >  
> > > > > Is Zeppelin “linked" against the GPL’d shell because Zeppelin depends 
> > > > >  
> > > on  
> > > > a  
> > > > > shell script to launch?  
> > > > >  
> > > > Obviously not.  
> > > > >  
> > > > > The interaction with R in the PR is the same.  
> > > > >  
> > > > >  
> > > >  
> > > > Again, bash is one of exceptions of GPL, like other GPL licensed  
> > > > compiler/interpreter.  
> > > >  
> > > > Check here why Bash and R is okay with Apache License.  
> > > > https://stat.ethz.ch/pipermail/r-help/2008-July/169332.html  
> > > >  
> > > > I'm not sure we can apply the same exception for 'using' KnitR.  
> > > >  
> > > > My point is not 'KnitR' is optional or not. Point is 'KnitRInterpreter' 
> > > >  
> > > you  
> > > > wrote is not an optional feature. Which is clearly not optionally 
> > > > enabled  
> > > > code and feature. And that depends on KnitR library which is GPL.  
> > > >  
> > > >  
> > > >  
> > > > > I was guessing SparkR can be still in Apache License even if it is  
> > > > depends  
> > > > > on R. Because of GPL licensed compiler generated output is not GPL  
> > > > license.  
> > > > > and R is sort of compiler. If you can get answer from Spark community 
> > > > >  
> > > how  
> > > > > SparkR get managed to stay in Apache License while R is GPL, the 
> > > > > answer  
> > > > > might help.  
> > > > > The description of SparkR is not accurate in any respect. (Do you 
> > > > > think  
> > > > > SparkR is not talking to GPL-licensed libraries?)  
> > > > >  
> > > > > I don’t see that any genuine issue is being raised here.  
> > > > >  
> > > > > If there is an issue, the burden is on you to identify it.  
> > > > >  
> > > > > If i give you one suggestion, Zeppelin committers sometimes ask 
> > > > > rebase  
> > > > the  
> > > > > contribution branch for some reason. It is not the really the best  
> > > > > practice, but still okay while most contributions are not including  
> > > large  
> > > > > code base changes  
> > > > > However, your one, has more than 4000 lines of code change. If you  
> > > rebase  
> > > > > then review should be started from the beginning, again. So you might 
> > > > >  
> > > > want  
> > > > > to minimize the rebase your branch.  
> > > > >  
> > > > > Are you actually complaining that the problem is that I rebased the  
> > > code  
> > > > > during the three-month period when no-one looked at it and Zeppelin  
> > > went  
> > > > > through a release?  
> > > > >  
> > > > > I cannot take it seriously when you say things like this.  
> > > > >  
> > > > > Having to “start from the beginning” cannot be a problem if you never 
> > > > >  
> > > > > actually started the first time...  
> > > > >  
> > > > >  
> > > >  
> > > > You wanted coordination and cooperation. So i gave you suggestion that  
> > > > helping review process. For example, your code has been rebased since 
> > > > my  
> > > > comment and jongyoul's comment. that means committers will need to look 
> > > >  
> > > > from the beginning. That'll require more time. And maybe, i guess 
> > > > that's  
> > > > not what you want. But If you don't care, feel free to rebase.  
> > > >  
> > > > Thanks,  
> > > > moon  
> > > >  
> > > >  
> > > >  
> > > > >  
> > > > > From: moon soo Lee <[email protected]>  
> > > > > Reply: moon soo Lee <[email protected]>  
> > > > > Date: December 1, 2015 at 4:42:06 AM  
> > > > > To: Amos B. Elberg <[email protected]>,  
> > > > > [email protected] <[email protected]> 
> > > > >  
> > > > > Subject: Re: contributions impasse. Was: [GitHub] incubator-zeppelin  
> > > pull  
> > > > > request: R Interpreter for Zeppelin  
> > > > >  
> > > > > On Tue, Dec 1, 2015 at 4:40 PM Amos B. Elberg <[email protected]> 
> > > > >  
> > > > > wrote:  
> > > > > Thank you, Cos.  
> > > > >  
> > > > > I’d like to briefly address the issues raised by Moon:  
> > > > >  
> > > > > 1. This PR does not passes CI  
> > > > > The CI fails on core Zeppelin, *not* code in this PR.  
> > > > >  
> > > > > I’ve been seeking assistance on this since August.  
> > > > >  
> > > > > The most common reason is that SparkInterpreter is unable to launch  
> > > Spark  
> > > > > and open a Spark Backend. This is necessary to test the PR.  
> > > > >  
> > > > > 60+ hours, has been spent adapting and re-basing when the  
> > > > SparkInterpreter  
> > > > > architecture changed and broke the PR’s *tests.*  
> > > > >  
> > > > >  
> > > > > I'm sorry, but the other PRs are passing CI. If it's problem on  
> > > Zeppelin  
> > > > > core, why do you think other PRs are passing CI?  
> > > > >  
> > > > > And let's say Zeppelin core has problem and that makes your PR fails 
> > > > > on  
> > > > CI  
> > > > > test. That's possible. But it still does not mean we can merge it 
> > > > > with  
> > > CI  
> > > > > failing.  
> > > > >  
> > > > > If you think it's problem on Zeppelin core, then file an issue that  
> > > > > reproduce the problem on Zeppelin core, that might be more efficient  
> > > than  
> > > > > keep trying yourself.  
> > > > >  
> > > > >  
> > > > > 2. Not 100% sure this PR has no license issue. (about KniteR)  
> > > > > What license problem *specifically* do you believe may exist?  
> > > > >  
> > > > > In preparing the PR, I:  
> > > > >  
> > > > > * Reviewed the Apache policy in detail.  
> > > > >  
> > > > > * Contacted the FSF to ask their interpretation of the “linking”  
> > > > > provisions of the GPL license.  
> > > > >  
> > > > > * Reviewed how other Apache software deals with this issue (e.g., 
> > > > > Spark  
> > > > > talks to R, which is GPL'd).  
> > > > >  
> > > > > * No necessary *dependencies* of the PR have license conflicts. In  
> > > > > several cases, I contacted package authors who agreed to re-issue 
> > > > > their  
> > > > > packages under Apache-compatible licenses. (Usually I had to do a bit 
> > > > >  
> > > of  
> > > > > coding in exchange…)  
> > > > >  
> > > > > * Where the license had to stay GPL, the packages are *not necessary* 
> > > > >  
> > > and  
> > > > > *not dependencies.* If the optional packages are present, they will 
> > > > > be  
> > > > > used to enable additional functionality. Knitr is an example. The PR  
> > > will  
> > > > > compile and run fine without knitr. If knitr is available (it is part 
> > > > >  
> > > of  
> > > > > the most common R distribution), the PR will enable the knitr  
> > > > interpreter.  
> > > > >  
> > > > > * This is exactly how this issue is addressed through the Apache  
> > > > > ecosystem.  
> > > > > The tl;dr is this: When Apache code is written to talk to libraries  
> > > that  
> > > > > may or may not be present on the user’s system, or where it talks to 
> > > > > an  
> > > > API  
> > > > > but is agnostic about implementation, that is not “linking” in a way  
> > > that  
> > > > > implicate the anti-linking provision of the GPL.  
> > > > >  
> > > > > Otherwise, no Apache code could ever call a shell script! Let alone 
> > > > > run  
> > > > > on Linux, or talk to R.  
> > > > >  
> > > > >  
> > > > > I'm not a legal expert. So following could be wrong.  
> > > > >  
> > > > > In my interpretation, KnitRInterpreter is not an optional feature 
> > > > > while  
> > > > it  
> > > > > is always enabled when compiling Zeppelin and always enabled when  
> > > running  
> > > > > Zeppelin. And it requires dynamically linked GPL library on runtime.  
> > > (yes  
> > > > > it will fail when no KnitR is installed on the system)  
> > > > >  
> > > > > And of course, no Apache code can ever call a shell script, on the  
> > > > purpose  
> > > > > of dynamic linking with GPL library.  
> > > > >  
> > > > > I was guessing SparkR can be still in Apache License even if it is  
> > > > depends  
> > > > > on R. Because of GPL licensed compiler generated output is not GPL  
> > > > license.  
> > > > > and R is sort of compiler.  
> > > > >  
> > > > > If you can get answer from Spark community how SparkR get managed to  
> > > stay  
> > > > > in Apache License while R is GPL, the answer might help.  
> > > > >  
> > > > >  
> > > > > 3. Need more time to review.  
> > > > > Has any reviewer has downloaded the PR or run the demo notebook? 
> > > > > (Which  
> > > > > is there for the benefit of reviewers, and isn’t intended to go in  
> > > final  
> > > > > distribution.)  
> > > > >  
> > > > > How many +1 comments from users would you like to see?  
> > > > >  
> > > > > How much time do you believe is required?  
> > > > >  
> > > > >  
> > > > > It all depends on when CI is going to pass, when license problem is  
> > > going  
> > > > > to be cleared, and when a committer willing to review and responsible 
> > > > >  
> > > to  
> > > > > commit your contribution.  
> > > > >  
> > > > >  
> > > > > 1. Large code base change  
> > > > > Large code base changes require coordination and cooperation. This PR 
> > > > >  
> > > > > necessarily implicates the build scripts, testing code, the  
> > > > > SparkInterpreter, etc.  
> > > > >  
> > > > > I have been seeking to coordinate since August.  
> > > > >  
> > > > > I continue to stand ready to do so.  
> > > > >  
> > > > > -Amos  
> > > > >  
> > > > >  
> > > > > If i give you one suggestion, Zeppelin committers sometimes ask 
> > > > > rebase  
> > > > the  
> > > > > contribution branch for some reason. It is not the really the best  
> > > > > practice, but still okay while most contributions are not including  
> > > large  
> > > > > code base changes.  
> > > > >  
> > > > > However, your one, has more than 4000 lines of code change. If you  
> > > rebase  
> > > > > then review should be started from the beginning, again. So you might 
> > > > >  
> > > > want  
> > > > > to minimize the rebase your branch.  
> > > > >  
> > > > > Thanks,  
> > > > > moon  
> > > > >  
> > > > >  
> > > > > From: moon soo Lee <[email protected]>  
> > > > > Reply: [email protected] <  
> > > > > [email protected]>  
> > > > > Date: December 1, 2015 at 1:34:19 AM  
> > > > > To: [email protected] <  
> > > [email protected]  
> > > > >  
> > > > > Subject: Re: contributions impasse. Was: [GitHub] incubator-zeppelin  
> > > pull  
> > > > > request: R Interpreter for Zeppelin  
> > > > >  
> > > > > Hi Cos,  
> > > > >  
> > > > > Thanks for opening a discussion.  
> > > > > My answer about 'Why this PR is open for three months' is  
> > > > >  
> > > > > 1. This PR does not passes CI  
> > > > > 2. Not 100% sure this PR has no license issue. (about KniteR)  
> > > > > 3. Need more time to review.  
> > > > >  
> > > > > It's my personal answer, other committers may have different opinion. 
> > > > >  
> > > > >  
> > > > >  
> > > > > I think the question should be generalized. Because this PR is not 
> > > > > the  
> > > > only  
> > > > > PR that is in impasse. There're more. For example  
> > > > >  
> > > > > Here's some examples that PR is not been merged.  
> > > > > https://github.com/apache/incubator-zeppelin/pull/53,  
> > > > > https://github.com/apache/incubator-zeppelin/pull/60  
> > > > > and so on.  
> > > > >  
> > > > > I can categorize the cases, based on experience of involving Zeppelin 
> > > > >  
> > > > > community from the beginning.  
> > > > >  
> > > > > 1. Large code base change  
> > > > >  
> > > > > When contribution has large code base changes, it tend to take more  
> > > time  
> > > > to  
> > > > > review and merged. Normally, most contributions merged in 1day~1 
> > > > > week.  
> > > > > But some contribution has large code base changes take 2~4 weeks. Few 
> > > > >  
> > > > > contribution that has very large code base change take months.  
> > > > >  
> > > > > 2. Communication lost  
> > > > >  
> > > > > Sometimes, committer is not responding, or contributor is not  
> > > responding.  
> > > > >  
> > > > > 3. Opinion diverges  
> > > > >  
> > > > > For some changes, included in contribution. When people have 
> > > > > different  
> > > > > opinion and it continue to diverges, those PRs are not been merged.  
> > > > >  
> > > > >  
> > > > > I think having a guide such as ping other committer when a committer 
> > > > > is  
> > > > not  
> > > > > responding, and divide contribution into small peaces if possible,  
> > > would  
> > > > > help most of the cases.  
> > > > > Of course committer have to pay attention more to the contribution 
> > > > > and  
> > > > > helping people. That's the first one.  
> > > > >  
> > > > > Thanks,  
> > > > > moon  
> > > > >  
> > > > > On Tue, Dec 1, 2015 at 1:54 PM Konstantin Boudnik <[email protected]>  
> > > > wrote:  
> > > > >  
> > > > > > To make sure we're on the same page, here are two threads that I  
> > > found  
> > > > > > related  
> > > > > > to this topic.  
> > > > > >  
> > > > > > Thread 1:  
> > > > > > Subject: R?  
> > > > > > Started on: July 1, 2015  
> > > > > >  
> > > > > > Thread 2:  
> > > > > > Subject: [GitHub] incubator-zeppelin pull request: R Interpreter 
> > > > > > for  
> > > > > > Zeppelin  
> > > > > > Started on: August 13, 2015  
> > > > > >  
> > > > > > If you want to fetch these from our archive send emails to  
> > > > > > [email protected]  
> > > > > > [email protected]  
> > > > > >  
> > > > > > Cos  
> > > > > >  
> > > > > > On Mon, Nov 30, 2015 at 06:27PM, Konstantin Boudnik wrote:  
> > > > > > > Guys,  
> > > > > > >  
> > > > > > > While catching up on my emails from the last a couple of weeks,  
> > > this  
> > > > > > thread  
> > > > > > > caught my attention. I am not normally paying much attention to 
> > > > > > > the  
> > > > > code  
> > > > > > > reviews traffic from GH, but this one is pretty different as it  
> > > spans  
> > > > > > three  
> > > > > > > months and counting.  
> > > > > > >  
> > > > > > > First, here are my five cents:  
> > > > > > > - r/R/rzeppelin/LICENSE is wrong: if the code is aimed to be  
> > > > > > contributed to  
> > > > > > > an ASF project this file should simply contain ASL2 text, like in 
> > > > > > >  
> > > [1]  
> > > > > > > - r/pom.xml perhaps shouldn't contain a separate <developers>  
> > > > section,  
> > > > > > but  
> > > > > > > Zeppelin might have different guidelines on it. Say, Bigtop 
> > > > > > > doesn't  
> > > > > > > maintain this in the source code, but we have the list of all the 
> > > > > > >  
> > > > > > > committers on the project's site [2] Every new committer's first  
> > > > > > commit is  
> > > > > > > to update the team page ;)  
> > > > > > > - comments like in  
> > > > > > r/src/main/java/org/apache/zeppelin/rinterpreter/KnitR.java  
> > > > > > >  
> > > > > > > +/**  
> > > > > > > + * Created by aelberg on 7/28/15.  
> > > > > > > + */  
> > > > > > >  
> > > > > > > is better to be removed. It has been already discussed here [3].  
> > > And  
> > > > > > the  
> > > > > > > initial discussion on the topic [4] was linked as well  
> > > > > > > - same goes to r/R/rzeppelin/DESCRIPTION. I am not sure if this 
> > > > > > > is  
> > > > > > R-specific  
> > > > > > > stuff - I have no idea about R, honestly, but  
> > > > > > >  
> > > > > > > +License: GPL (>= 2) | BSD_3_clause + file LICENSE  
> > > > > > > ...  
> > > > > > > +Author: David B. Dahl  
> > > > > > >  
> > > > > > > shouldn't be here, IMO. Normally, if some additional licenses are 
> > > > > > >  
> > > > > > used,  
> > > > > > > they have to be listed in the top-level NOTICE file (already  
> > > there).  
> > > > > > >  
> > > > > > > - I am not going to offer any comments on the technical merits of 
> > > > > > >  
> > > the  
> > > > > > patch,  
> > > > > > > as I haven't tried it personally. However, I don't see any 
> > > > > > > serious  
> > > > > > > technical objections to the functionality in question.  
> > > > > > >  
> > > > > > > So, the question is - why the PR is open for three months? I 
> > > > > > > hasn't  
> > > > > been  
> > > > > > able  
> > > > > > > to get a clear answer. What I found out though is pretty  
> > > unsettling,  
> > > > > > really.  
> > > > > > > The communication on the topic is almost non-existent, except for 
> > > > > > >  
> > > > this  
> > > > > > sparse  
> > > > > > > and bitter thread in the GH.  
> > > > > > >  
> > > > > > > I would love to hear from the committers what's stopping the  
> > > > acceptance  
> > > > > > of the  
> > > > > > > code, besides of the minor issues I've mentioned earlier? What 
> > > > > > > are  
> > > > the  
> > > > > > reasons for it?  
> > > > > > > Is there anything wrong with it?  
> > > > > > > One of the responsibilities of the committers is to make sure the 
> > > > > > >  
> > > > > > > contributions are reviewed; new contributors are guided and do  
> > > > > > understand how  
> > > > > > > the project ticks. The easy feedback flow attracts new people,  
> > > > allowing  
> > > > > > the  
> > > > > > > community to grow and thrive.  
> > > > > > >  
> > > > > > > I am asking _explicitely_ not to re-start the bickering I have  
> > > > already  
> > > > > > > seen. At this point I am interested in the purely technical side 
> > > > > > > of  
> > > > > this.  
> > > > > > >  
> > > > > > > [1] https://github.com/apache/bigtop/blob/master/LICENSE  
> > > > > > > [2] http://bigtop.apache.org/team-list.html  
> > > > > > > [3]  
> > > > > >  
> > > > >  
> > > >  
> > > http://apache-nifi-developer-list.39713.n7.nabble.com/author-tags-td1335.html
> > >   
> > > > > > > [4] http://s.apache.org/iZl  
> > > > > > >  
> > > > > > > With regards,  
> > > > > > > Cos  
> > > > > > >  
> > > > > > > On Mon, Nov 16, 2015 at 11:06PM, elbamos wrote:  
> > > > > > > > Github user elbamos commented on the pull request:  
> > > > > > > >  
> > > > > > > >  
> > > > > >  
> > > > >  
> > > >  
> > > https://github.com/apache/incubator-zeppelin/pull/208#issuecomment-157203411
> > >   
> > > > > > > >  
> > > > > > > > The current push should resolve some issues with changes in the 
> > > > > > > >  
> > > > > > > > Spark-Zeppelin interface that had created issues for users, as  
> > > > > > well as  
> > > > > > > > support for 1.5.1.  
> > > > > > > >  
> > > > > > > > Knitr support is improved, and the reason for a separate knitr  
> > > > > > interpreter may be clearer now.  
> > > > > > > >  
> > > > > > > > The amount of code borrowed from rscala is reduced.  
> > > > > > > >  
> > > > > > > > I did not address issues with @author tags, or files under the 
> > > > > > > > R/  
> > > > > > > > folder. The reason is, to be blunt, I don't understand what the 
> > > > > > > >  
> > > > > > precise  
> > > > > > > > concerns actually are.  
> > > > > > > >  
> > > > > > > > Please note that I changed .travis.yml to only use spark 1.4 
> > > > > > > > and  
> > > > > > later.  
> > > > > > > > I'm sure there is a better way to do it, but I'm just not in a  
> > > > > > position  
> > > > > > > > to try to figure out the entire Zeppelin build process.  
> > > > > > > >  
> > > > > > > > Integrating this with the rest of zeppelin is going to take 
> > > > > > > > some  
> > > > > > work  
> > > > > > > > regarding pom's, travis, and so forth. I can do a lot of that,  
> > > > > > but I'm  
> > > > > > > > going to need to discuss it with the people who have been  
> > > "owning"  
> > > > > > those  
> > > > > > > > files. There are just too many moving pieces here.  
> > > > > > > >  
> > > > > > > > Because of the size of this (which is, unfortunately, 
> > > > > > > > necessary),  
> > > > > > > > posting here is probably not the most efficient way. That is 
> > > > > > > > also  
> > > > > > true  
> > > > > > > > because certain people chose to use this PR as a forum to air  
> > > other  
> > > > > > > > issues. Therefore, it would be better if reviewers e-mail me  
> > > > > > directly.  
> > > > > >  
> > > > > >  
> > > > > >  
> > > > >  
> > > >  
> > >  

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