Welcome contributors! We strive to include everyone's contributions. This page provides necessary guidelines on how to contribute effectively towards furthering the development and evolution of Sqoop. You should also read the guide on Setting up Sqoop 1 where you will find details on how to checkout, build and test Sqoop. If you are interested in contributing to Sqoop2, please follow Setting up Sqoop 2

Note: This guide applies to general contributors. If you are a committer, please read the Guide for Committers as well.

What can be contributed?

There are many ways you can contribute towards the project. A few of these are:

Jump in on discussions: It is possible that someone initiates a thread on the mailing list describing a problem that you have dealt with in the past. You can help the project by chiming in on that thread and guiding that user to overcome or workaround that problem or limitation.

File Bugs: If you notice a problem and are sure it is a bug, then go ahead and file a JIRA. If however, you are not very sure that it is a bug, you should first confirm it by discussing it on the Mailing Lists.

Review Code: If you see that a JIRA ticket has a 'Patch Available' status, go ahead and review it. It cannot be stressed enough that you must be kind in your review and explain the rational for your feedback and suggestions. Also note that not all review feedback is accepted - often times it is a compromise between the contributor and reviewer. If you are happy with the change and do not spot any major issues +1 it. More information on this is available in the following sections.

Provide Patches: We encourage you to assign the relevant JIRA issue to yourself and supply a patch for it. The patch you provide can be code, documentation, build changes, or any combination of these. More information on this is available in the following sections. We are using label "newbie" to JIRAs that are suitable for new contributors as proposed changes should be simpler to implement. You can see list of all opened JIRA tickets with newbie tag here.

Read the Quick Hack Sheet

Reviewing Code

Sqoop uses the Apache Review Board for doing code reviews. In order for a change to be reviewed, it should be either posted on the review board or attached to the JIRA. If the change is a minor change affecting only few lines and does not seem to impact main logic of the affected sources, it need not be posted on the review board. However, if the code change is large or otherwise impacting the core logic of the affected sources, it should be posted on the review board. Feel free to comment on the JIRA requesting the assignee to post the patch for review on review board.

Note: Not all patches attached to a JIRA are ready for review. Sometimes the patches are attached just to solicit early feedback regarding the implementation direction. Feel free to look it over and give your feedback in the JIRA as necessary. Patches are considered ready for review either when the patch has been posted on review board, or the JIRA status has been changed to 'Patch Available'.

Goals for Code Reviews

The net outcome from the review should be the same - which is to ensure the following:

Code review guidelines

Following are some guidelines on how to do a code review. You may use any other approach instead as long as the above stated goals are met. That said, here is an approach that works fine generally:

How to give feedback

Once you have collected your comments/concerns/feedback you need to send it to back to the contributor. In doing so, please be as courteous as possible and ensure the following:

Once you have provided your feedback, wait for the developer to respond. It is possible that the developer may need further clarification on your feedback, in which case you should promptly provide it where necessary. In general, the dialog between the reviewer and developer should lead to finding a reasonable middle ground where key concerns are satisfied and the goals of the review have been met.

If a change has met all your criteria for review, please +1 the change to indicate that you are happy with it.

Providing Patches

In order to provide patches, follow these guidelines: