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= How to Contribute to Pig =
== Getting the source code ==

First of all, you need the Pig source code.

Get the source code on your local drive using 
[ SVN]. Most development is 
done on the "trunk":

svn checkout 

##If you prefer to use Eclipse for development, there are instructions for 
setting up SVN access from within Eclipse at EclipseEnvironment.

== Making Changes ==

Before you start, send a message to the 
[ Pig developer mailing 
list], or file a bug report in
[ Jira]. Describe your proposed changes 
and check that they fit in with what others are doing and have planned
for the project. Be patient, it may take folks a while to understand your 

Modify the source code and add some (very) nice features or fix some (nasty) 
bugs using your favorite IDE.

But take care about the following points

    * All public classes and methods should have informative 
[ Javadoc]  comments.
          * Do not use @author tags.
    * Code should be formatted according to [ 
Sun's conventions].  We use four spaces ('''not''' tabs) for indentation.
    * Contributions should pass existing unit tests.
    * New unit tests should be provided to demonstrate bugs and fixes. 
[ JUnit] is our test framework:
          * You must implement a class that extends junit.framework.TestCase 
and whose class name starts with Test.
          * Define methods within your class whose names begin with test, and 
call JUnit's many assert methods to verify conditions; these methods will be 
executed when you run ant test.
          * Place your class in the test tree.
          * you can run all the unit test with the command `ant test`, or you 
can run a specific unit test with the command `ant test -Dtestcase=<ClassName>` 
(For example `ant test -Dtestcase=TestPigFile`)

== Generating a patch ==
=== Compilation ===
Make sure that your code introduces no new warnings into the javac compilation.

=== Unit Tests ===
Please make sure that all unit tests succeed before constructing your patch.

> cd trunk
> ant -Djavac.args="-Xlint -Xmaxwarns 1000" clean jar test

After a while, if you see


all is ok, but if you see


then please examine error messages in build/test and fix things before 

=== Javadoc ===

Please also check the javadoc.

> ant doc
> firefox docs/index.html

Examine all public classes you've changed to see that documentation is complete 
and informative. Your patch must not generate any javadoc warnings.

=== Creating a patch ===

Check to see what files you have modified with:

svn stat

Add any new files with:

svn add src/.../

Edit the CHANGES.txt file, adding a description of your change, including the 
bug number it fixes. If this is a new feature, or other enhancement that
doesn't currently have a ticket please create one for it, then use it's number 
when adding your note to CHANGES.txt. You'll need this ticket to submit your 

In order to create a patch, just type:

svn diff > myBeautifulPatch.patch

This will report all modifications done on Hadoop sources on your local disk 
and save them into the myBeautifulPath.patch file. Read the patch file. Make 
sure it
includes ONLY the modifications required to fix a single issue.

Please do not:

    * reformat code unrelated to the bug being fixed: formatting changes should 
be separate patches/commits.
    * comment out code that is now obsolete: just remove it.
    * insert comments around each change, marking the change: folks can use 
subversion to figure out what's changed and by whom.
    * make things public which are not required by end users.

Please do:

    * try to adhere to the coding style of files you edit;
    * comment code whose function or rationale is not obvious;
    * update documentation (e.g., package.html files, this wiki, etc.)

=== Applying a patch ===

To apply a patch either you generated or found from JIRA, you can issue

patch -p0 <cool_patch.patch

if you just want to check whether the patch applies you can run patch with 
--dry-run option

patch -p0 --dry-run <cool_patch.patch

If you are an Eclipse user, you can apply a patch by :
 1. Right click project name in Package Explorer,
 2. Team -> Apply Patch

=== Contributing your work ===

Finally, patches should be attached to a bug report in 
[ Jira] via the Attach File link on the 
jira. Please add a comment
that asks for a code review following our code review checklist. Please note 
that the attachment should be granted license to ASF for inclusion in ASF works 
per the [ Apache License] subsection 

When you believe that your patch is ready to be committed, select the 'Submit 
Patch' link from the 'Available Workflow Actions' section in Jira.

##Submitted patches will be automatically tested against "trunk" by [WWW] 
Hudson, the lucene project's continuous integration engine. Upon test 
completion, Hudson will add a success ("+1") message or failure ("-1") to your 
bug report in Jira. If your issue contains multiple patch versions, Hudson 
tests the last patch uploaded.

## This should be moved up above, rather than giving more directions here.  We 
don't support checkstyle yet.  Need to do that.  >> Folks should run 'ant clean 
test javadoc checkstyle' before selecting 'Submit Patch'. Tests should all 
pass. Javadoc should report no warnings or errors. Checkstyle's error count 
should not exceed that listed at [WWW] Checkstyle Errors Hudson's tests should 
only double-check things, and not be used as a primary patch tester, which 
would create too much noise on the mailing list and in Jira. Submitting patches 
that fail Hudson testing is frowned on, (unless the failure is not actually due 
to the patch).

If your patch involves performance optimizations, they should be validated by 
benchmarks that demonstrate an improvement.

## Once a "+1" comment is received from the automated patch testing system and 
a "+1, code reviewed" comment is received from a code reviewer, a committer 
should then evaluate it within a few days and either: commit it; or reject it 
with an explanation.
Once your patch has been submitted, a committer should then evaluate it within 
a few days and either: commit it; or reject it with an explanation.

Please be patient. Committers are busy people too. If no one responds to your 
patch after a few days, please make friendly reminders. Please incorporate 
suggestions into into your patch if you think they're reasonable. Finally, 
remember that even a patch that is not committed is useful to the community.

## Should your patch earn a -1 on the Hudson test, set the issue status to 
'Resume Progress', upload a patch with necessary fixes and then set the status 
to 'Submit Patch' again.

Committers: for non-trivial changes, it is best to get another committer to 
review your patches before commit. Use "Submit Patch" like other contributors, 
and then
wait for a "+1" from another committer before committing. Please also try to 
frequently review things in the patch queue.

== Jira Guidelines ==

Please comment on issues in Jira, making your concerns known. Please also vote 
for issues that are a high priority for you.

Please refrain from editing descriptions and comments if possible, as edits 
spam the mailing list and clutter Jira's "All" display, which is otherwise very 
Instead, preview descriptions and comments using the preview button (on the 
right) before posting them. Keep descriptions brief and save more elaborate 
for comments, since descriptions are included in Jira's automatically sent 
messages. If you change your mind, note this in a new comment, rather than 
editing an
older comment. The issue should preserve this history of the discussion.

== Stay involved ==

Contributors should join the 
[ Pig mailing lists]. In 
particular, the commit list (to see changes as they are made),
the dev list (to join discussions of changes) and the user list (to help 

See Also

    * [ Apache contributor 
    * [ Apache voting documentation]

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