1. GitHub pull-request

Create pull request

You need to have a fork of Apache Ignite mirror on GitHub.
Fix / implement JIRA ticket in your fork. Commit to remote branch.
Create pull request from the new remote branch in the fork to Apache Ignite master.
TeamCity will automatically trigger builds and label it as a "pull/<pull-request-number>/head". Select this label in the branches dropdown and monitor test results.
Once tests are passed, the pull request can be reviewed and merged by a committer.

To merge a pull request you need to have two remotes - one for Apache repo and another for GitHub mirror. They can be added like this:

git remote add apache https://git-wip-us.apache.org/repos/asf/incubator-ignite
git remote add upstream git@github.com:apache/incubator-ignite.git

To merge a pull request to Apache Ignite master do the following (replace <xxx> with the pull request number):

Go to you fork, make sure it doesn't have any uncommitted changes.
Fetch pull request to a local branch:
- git fetch upstream pull/<xxx>/head:pr-<xxx>
Merge from the new branch to master:
- git merge --squash pr-<xxx>
Commit to local master. Do not forget to specify author and provide a comment that will close the pull request (see https://help.github.com/articles/closing-issues-via-commit-messages/):
- git commit --author=“John Doe <jdoe@apache.org>" -m “ignite-999 - Cool feature implemented. Closes #<xxx>.”
Push to 'apache' remote:
- git push apache master

 +------------+             +---------------+            +-----------------+

...

                                                         +-----------------+

You need to have a fork of Apache Ignite mirror on GitHub.
Fix / implement JIRA ticket in your fork. Commit to remote branch.
Create pull request from the new remote branch in the fork to Apache Ignite master.
TeamCity will automatically trigger builds and label it as a "pull/<pull-request-number>/head". Select this label in the branches dropdown and monitor test results.
Once tests are passed, the pull request can be reviewed and merged by a committer.

To merge a pull request you need to have two remotes - one for Apache repo and another for GitHub mirror. They can be added like this:

git remote add apache https://git-wip-us.apache.org/repos/asf/incubator-ignite
git remote add upstream git@github.com:apache/incubator-ignite.git

To merge a pull request to Apache Ignite master do the following (replace <xxx> with the pull request number):

Go to you fork, make sure it doesn't have any uncommitted changes.
Fetch pull request to a local branch:
- git fetch upstream pull/<xxx>/head:pr-<xxx>
Merge from the new branch to master:
- git merge --squash pr-<xxx>
Commit to local master. Do not forget to specify author and provide a comment that will close the pull request (see https://help.github.com/articles/closing-issues-via-commit-messages/):
- git commit --author=“John Doe <jdoe@apache.org>" -m “ignite-999 - Cool feature implemented. Closes #<xxx>.”
Push to 'apache' remote:
- git push apache master

...