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From Jarek Jarcec Cecho <jar...@apache.org>
Subject Re: Sqoop 2 JAVA coding guidelines
Date Tue, 02 Dec 2014 02:17:16 GMT
Thank you for putting the coding guidelines together Veena. I’ve read the page and I don’t
see anything concerning. I have to admit that I did not read the whole Google guideline so
I’m wondering if there are any huge differences between current (albeit unwritten) rules
and the proposed Google guidelines?

I’ve added/edited the content a bit, trying to put some small comments without changing
the semantics of the page. I have following larger points:

1) Line size

The “General Rules” section specifies that the “Column limit can be 80 or 100 characters”,
the subsection “ Column Limit and Line Wrapping” is stating only “100” and then suggesting
that we could also drop any line limits. I would suggest to synchronize those places together
as it seems quite confusing.

I would personally vote to not have any sharp limit for maximum line size. We have 80 characters
limit in Sqoop 1 and it makes code very hardly readable at some places, so I like the Kafka
wording “no maximum size, but be reasonable”.

2) Applying the changes

Considering that we might introduce some changes against current (unwritten) rules, I think
that we should talk about how we’re going to enforce the coding guidelines going forward.
This is not a question for new files as those should obviously follow them. I’m more interested
to discuss how we’re going to handle changes in current files. As we are trying to keep
each patch focusing on given functionality and we’re discouraging unrelated changes, I would
propose to discourage people to enforce those rules in existing files if that would mean to
significantly refactor the file just for the purpose of being compliant with our code guidelines.

This of course doesn’t mean that people should not follow the guidelines at all (new content
should follow them) or that we’re going to stick to the old formatting forever (on large
file refactoring it would be OK to apply such changes).  I’m just worried about introducing
a lot of unnecessary changes just to keep in sync with coding guidelines.


> On Nov 30, 2014, at 6:29 PM, Veena Basavaraj <vbasavaraj@cloudera.com> wrote:
> Qian,
> I think we both are on the same page.
> I just wrote the guidelines wiki to to come up with the code style.
> One we all vote on the wiki, we can formulate those rules as IDE specific
> files, like the one you attached for intelliJ
> Hope it clears the confusion now.
> Best,
> *./Vee*
> On Sun, Nov 30, 2014 at 6:20 PM, Xu, Qian A <qian.a.xu@intel.com> wrote:
>> Hi Veena,
>> A code guideline will definitively help both developers and reviews to
>> contribute code better. I'd suggest apply code style to new code
>> contribution first.
>> --Qian (Stanley) Xu
>> -----Original Message-----
>> From: Veena Basavaraj [mailto:vbasavaraj@cloudera.com]
>> Sent: Monday, December 01, 2014 10:09 AM
>> To: dev@sqoop.apache.org
>> Subject: Re: Sqoop 2 JAVA coding guidelines
>> Thanks Qian, I will attach it, do you have any comments on the guidelines?
>> We should all vote for the wiki guidelines before we attach the formatter.
>> Please send an email to the dev@ list asking permission to edit the wiki.
>> Best,
>> *./Vee*
>> On Sun, Nov 30, 2014 at 5:59 PM, Xu, Qian A <qian.a.xu@intel.com> wrote:
>>> Hi there.
>>> I don’t have the privilege to add attachment to Wiki , so I've
>>> attached code formatter of IntelliJ (v13.1). I hope this helps.
>>> --Qian (Stanley) Xu
>>> -----Original Message-----
>>> From: Gwen Shapira [mailto:gshapira@cloudera.com]
>>> Sent: Monday, December 01, 2014 8:46 AM
>>> To: dev@sqoop.apache.org
>>> Subject: Re: Sqoop 2 JAVA coding guidelines
>>> I think its a great idea to document the coding standards that already
>>> exist for this project.
>>> It can be frustrating to new contributors to have to guess their way
>>> around our un-written expectations.
>>> Gwen
>>> On Sun, Nov 30, 2014 at 2:05 PM, Veena Basavaraj
>>> <vbasavaraj@cloudera.com>
>>> wrote:
>>>> Hey all,
>>>> Since a few months I have been contributing to Sqoop2, I do notice a
>>>> lack of style guide for sqoop2 code.
>>>> I have started a wiki highlighting things for developers to follow.
>>>> https://cwiki.apache.org/confluence/display/SQOOP/Sqoop+2+Coding+Gui
>>>> de lines I prefer the google java style guide to begin with.
>>>> Please add your comments in the comments section on things you would
>>>> like to have, so we can iterate over this in the coming few weeks
>>>> and settle down to a standard that every one can use in their IDE. I
>>>> am happy to create a formatter XML for eclipse as per these rules
>>>> and attach it to the wiki.
>>>> Best,
>>>> *./Vee*

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