Matt Foley 2012-11-21, 19:15
Radim Kolar 2012-11-23, 23:40
Matt Foley 2012-11-24, 20:13
Radim Kolar 2012-11-24, 21:26
Konstantin Boudnik 2012-11-24, 22:03
Alejandro Abdelnur 2012-11-21, 19:25
Radim Kolar 2012-11-21, 20:46
Konstantin Boudnik 2012-11-21, 21:33
-Re: [PROPOSAL] introduce Python as build-time and run-time dependency for Hadoop and throughout Hadoop stack
I like Alejandro's idea about Maven for a few of reasons:
- bringing in a scripting environment which is known for its inter-version
idiosyncrasies just because Windows can't handle trivial shell scripting
looks like an overkill to me
- relative to above, there's a chance that Python's pre-requisites used in
Hadoop might get into a conflict with some other components in the stack.
This will be a nightmare for the integrator projects i.e. Bigtop
- Maven is de-facto standard for Java stacks
- Maven has built-in scripting language (Groovy) if some plugins aren't
sufficient for achieving whatever goals
Addressing Matt's later point about non-Mavenized Hadoop-1 line: it uses Maven
stuff suchs as deploy/install via custom ant tasks. Same approach would work
for saveVersion.sh and others, I am sure.
On Wed, Nov 21, 2012 at 11:25AM, Alejandro Abdelnur wrote:
> Hey Matt,
> We already require java/mvn/protoc/cmake/forrest (forrest is hopefully on
> its way out with the move of docs to APT)
> Why not do a maven-plugin to do that?
> Colin already has something to simplify all the cmake calls from the builds
> using a maven-plugin (https://issues.apache.org/jira/browse/HADOOP-8887)
> We could do the same with protoc, thus simplifying the POMs.
> The saveVersion.sh seems like another prime candidate for a maven plugin,
> and in this case it would not require external tools.
> Does this make sense?
> On Wed, Nov 21, 2012 at 11:15 AM, Matt Foley <[EMAIL PROTECTED]> wrote:
> > This discussion started in
> > HADOOP-8924<https://issues.apache.org/jira/browse/HADOOP-8924>
> > , where it was proposed to replace the build-time utility "saveVersion.sh"
> > with a python script. This would require Python as a build-time
> > dependency. Here's the background:
> > Those of us involved in the branch-1-win port of Hadoop to Windows without
> > use of Cygwin, have faced the issue of frequent use of shell scripts
> > throughout the system, both in build time (eg, the utility
> > "saveVersion.sh"),
> > and run time (config files like "hadoop-env.sh" and the start/stop scripts
> > in "bin/*" ). Similar usages exist throughout the Hadoop stack, in all
> > projects.
> > The vast majority of these shell scripts do not do anything platform
> > specific; they can be expressed in a posix-conforming way. Therefore, it
> > seems to us that it makes sense to start using a cross-platform scripting
> > language, such as python, in place of shell for these purposes. For those
> > rare occasions where platform-specific functionality really is needed,
> > python also supports quite a lot of platform-specific functionality on both
> > Linux and Windows; but where that is inadequate, one could still
> > conditionally invoke a platform-specific module written in shell (for
> > Linux/*nix) or powershell or bat (for Windows).
> > The primary motive for moving to a cross-platform scripting language is
> > maintainability. The alternative would be to maintain two complete suites
> > of scripts, one for Linux and one for Windows (and perhaps others in the
> > future). We want to avoid the need to update dual modules in two different
> > languages when functionality changes, especially given that many Linux
> > developers are not familiar with powershell or bat, and many Windows
> > developers are not familiar with shell or bash.
> > Regarding the choice of python:
> > - There are already a few instances of python usage in Hadoop, such as
> > the utility (currently broken) "relnotes.py", and massive usage of
> > python
> > in the examples/ and contrib/ directories.
> > - Python is also used in Bigtop build-time.
> > - The Python language is available for free on essentially all
> > platforms, under an Apache-compatible
> > license<http://www.apache.org/legal/resolved.html>.
> > - It is supported in Eclipse and similar IDEs.
> > - Most importantly, it is widely accepted as a reasonably good OO
Matt Foley 2012-11-21, 21:14
Konstantin Boudnik 2012-11-21, 21:50
Andy Isaacson 2012-11-21, 23:00
Radim Kolar 2012-11-21, 23:58
Steve Loughran 2012-11-22, 09:21
Konstantin Boudnik 2012-11-22, 01:46
Radim Kolar 2012-11-22, 01:57
Chris Nauroth 2012-11-21, 21:03
Radim Kolar 2012-11-21, 21:30
Chris Nauroth 2012-11-21, 21:44
Radim Kolar 2012-11-21, 23:15
Chris Nauroth 2012-11-22, 00:14
Radim Kolar 2012-11-22, 01:55
Chris Nauroth 2012-11-22, 02:40
Radim Kolar 2012-11-22, 14:54
Steve Loughran 2012-11-22, 09:02
Matt Foley 2012-11-21, 19:44
Alejandro Abdelnur 2012-11-21, 19:58
Steve Loughran 2012-11-22, 09:14