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1. Other reviewers, including committers can try out the changes locally and either approve or give their comments as suggestions on the pull request by submitting a review on the pull request. More help can be found here.
2. If more changes are required, reviewers are encouraged to leave their comments on the lines of code that require changes. The author of the pull request can then update the code and push another commit to the same branch to update the pull request and notify the committers.
3. The pull request can be merged if atleast one committer has approved it or commented "LGTM" which means "Looks Good To Me". If you comment LGTM you will be expected to help with bugs or follow-up issues on the patch. (Remember committers cannot review their own patch. If a committer opens a PR, they should make sure that another committer reviews it.)
4. Sometimes, other changes might be merged which conflict with the pull request’s changes. The PR can’t be merged until the conflict is resolved. This can be resolved by running git fetch upstream followed by git rebase upstream/[branch-name] and resolving the conflicts by hand, then pushing the result to your branch.
5. If a PR is merged, promptly close the PR and resolve the JIRA as "Fixed". 

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