Share the management burden as well as the technical burden of running the project. As a project becomes more complex, more and more of the work is about managing people and information flow. There is no reason not to share that burden, and sharing it does not necessarily require a top-down hierarchy either—what happens in practice tends to be more of a peer-to-peer network topology than a military-style command structure.
Sometimes management roles are formalized, and sometimes they happen spontaneously. In the Subversion project, we have a patch manager, a translation manager, documentation managers, issue managers (albeit unofficial), and a release manager. Some of these roles we made a conscious decision to initiate, others just happened by themselves; as the project grows, I expect more roles to be added. Below we'll examine these roles, and a couple of others, in detail (except for release manager, which was already covered in the section called “Release manager” and the section called “Dictatorship by Release Owner” earlier in this chapter).
As you read the role descriptions, notice that none of them requires exclusive control over the domain in question. The issue manager does not prevent other people from making changes in the issues database, the FAQ manager does not insist on being the only person to edit the FAQ, and so on. These roles are all about responsibility without monopoly. An important part of each domain manager's job is to notice when other people are working in that domain, and train them to do the things the way the manager does, so that the multiple efforts reinforce rather than conflict. Domain managers should also document the processes by which they do their work, so that when one leaves, someone else can pick up the slack right away.
Sometimes there is a conflict: two or more people want the same role. There is no one right way to handle this. You could suggest that each volunteer post a proposal (an "application") and have all the committers vote on which is best. But this is cumbersome and potentially awkward. I find that a better technique is just to ask the multiple candidates to settle it among themselves. They usually will, and will be more satisfied with the result than if a decision had been imposed on them from the outside.
In a free software project that receives a lot of patches, keeping track of which patches have arrived and what has been decided about them can be a nightmare, especially if done in a decentralized way. Most patches arrive as posts to the project's development mailing list (though some may appear first in the issue tracker, or on external web sites), and there are a number of different routes a patch can take after arrival.
Sometimes someone reviews the patch, finds problems, and bounces it back to the original author for cleanup. This usually leads to an iterative process—all visible on the mailing list—in which the original author posts revised versions of the patch until the reviewer has nothing more to criticize. It is not always easy to tell when this process is done: if the reviewer commits the patch, then clearly the cycle is complete. But if she does not, it might be because she simply didn't have time, or doesn't have commit access herself and couldn't rope any of the other developers into doing it.
Another frequent response to a patch is a freewheeling discussion, not necessarily about the patch itself, but about whether the concept behind the patch is good. For example, the patch may fix a bug, but the project prefers to fix that bug in another way, as part of solving a more general class of problems. Often this is not known in advance, and it is the patch that stimulates the discovery.
Occasionally, a posted patch is met with utter silence. Usually this is due to no developer having time at that moment to review the patch, so each hopes that someone else will do it. Since there's no particular limit to how long each person waits for someone else to pick up the ball, and meanwhile other priorities are always coming up, it's very easy for a patch to slip through the cracks without any single person intending for that to happen. The project might miss out on a useful patch this way, and there are other harmful side effects as well: it is discouraging to the author, who invested work in the patch, and it makes the project as a whole look a bit out of touch, especially to others considering writing patches.
The patch manager's job is to make sure that patches don't "slip through the cracks." This is done by following every patch through to some sort of stable state. The patch manager watches every mailing list thread that results from a patch posting. If it ends in a commit of the patch, he does nothing. If it goes into a review/revise iteration, ending with a final version of the patch but no commit, he files an issue pointing to the final version, and to the mailing list thread around it, so that there is a permanent record for developers to follow up on later. If the patch addresses an existing issue, he annotates that issue with the relevant information, instead of opening a new issue.
When a patch gets no reaction at all, the patch manager waits a few days, then follows up asking if anyone is going to review it. This usually gets a reaction: a developer may explain that she doesn't think the patch should be applied, and give the reasons why, or she may review it, in which case one of the previously described paths is taken. If there is still no response, the patch manager may or may not file an issue for the patch, at his discretion, but at least the original submitter got some reaction.
Having a patch manager has saved the Subversion development team a lot of time and mental energy. Without a designated person to take responsibility, every developer would constantly have to worry "If I don't have time to respond to this patch right now, can I count on someone else doing it? Should I try to keep an eye on it? But if other people are also keeping an eye on it, for the same reasons, then we'd have needlessly duplicated effort." The patch manager removes the second-guessing from the situation. Each developer can make the decision that is right for her at the moment she first sees the patch. If she wants to follow up with a review, she can do that—the patch manager will adjust his behavior accordingly. If she wants to ignore the patch completely, that's fine too; the patch manager will make sure it isn't forgotten.
Because this system works only if people can depend on the patch manager being there without fail, the role should be held formally. In Subversion, we advertised for it on the development and users mailing lists, got several volunteers, and took the first one who replied. When that person had to step down (see the section called “Transitions” later in this chapter), we did the same thing again. We've never tried having multiple people share the role, because of the communications overhead that would be required between them; but perhaps at very high volumes of patch submission, a multiheaded patch manager might make sense.
In software projects, "translation" can refer to two very different things. It can mean translating the software's documentation into other languages, or it can mean translating the software itself—that is, having the program display errors and help messages in the user's preferred language. Both are complex tasks, but once the right infrastructure is in place, they are largely separable from other development. Because the tasks are similar in some ways, it may make sense (depending on your project) to have a single translation manager handle both, or it may be better to have two different managers.
In the Subversion project, we have one translation manager handle both. He does not actually write the translations himself, of course—he may help out on one or two, but as of this writing, he would need to speak ten languages (twelve counting dialects) in order to work on all of them! Instead, he manages teams of volunteer translators: he helps them coordinate among each other, and he coordinates between the teams and the rest of the project.
Part of the reason the translation manager is necessary is that translators are a different demographic from developers. They sometimes have little or no experience working in a version control repository, or indeed with working as part of a distributed volunteer team at all. But in other respects they are often the best kind of volunteer: people with specific domain knowledge who saw a need and chose to get involved. They are usually willing to learn, and enthusiastic to get to work. All they need is someone to tell them how. The translation manager makes sure that the translations happen in a way that does not interfere unnecessarily with regular development. He also serves as a sort of representative of the translators as a unified body, whenever the developers must be informed of technical changes required to support the translation effort.
Thus, the position's most important skills are diplomatic, not technical. For example, in Subversion we have a policy that all translations should have at least two people working on them, because otherwise there is no way for the text to be reviewed. When a new volunteer shows up offering to translate Subversion to, say, Malagasy, the translation manager has to either hook him up with someone who posted six months ago expressing interest in doing a Malagasy translation, or else politely ask the volunteer to go find another Malagasy translator to work with as a partner. Once enough people are available, the manager sets them up with the proper kind of commit access, informs them of the project's conventions (such as how to write log messages), and then keeps an eye out to make sure they adhere to those conventions.
Conversations between the translation manager and the developers, or between the translation manager and translation teams, are usually held in the project's original language—that is, the language from which all the translations are being made. For most free software projects, this is English, but it doesn't matter what it is as long as the project agrees on it. (English is probably best for projects that want to attract a broad international development community, though.)
Conversations within a particular translation team usually happen in their shared language, however, and one of the other tasks of the translation manager is to set up a dedicated mailing list for each team. That way the translators can discuss their work freely, without distracting people on the project's main lists, most of whom would not be able to understand the translation language anyway.
Keeping software documentation up-to-date is a never-ending task. Every new feature or enhancement that goes into the code has the potential to cause a change in the documentation. Also, once the project's documentation reaches a certain level of completeness, you will find that a lot of the patches people send in are for the documentation, not for the code. This is because there are many more people competent to fix bugs in prose than in code: all users are readers, but only a few are programmers.
Documentation patches are usually much easier to review and apply than code patches. There is little or no testing to be done, and the quality of the change can be evaluated quickly just by review. Since the quantity is high, but the review burden fairly low, the ratio of administrative overhead to productive work is greater for documentation patches than for code patches. Furthermore, most of the patches will probably need some sort of adjustment, in order to maintain a consistent authorial voice in the documentation. In many cases, patches will overlap with or affect other patches, and need to be adjusted with respect to each other before being committed.
Given the exigencies of handling documentation patches, and the fact that the code base needs to be constantly monitored so the documentation can be kept up-to-date, it makes sense to have one person, or a small team, dedicated to the task. They can keep a record of exactly where and how the documentation lags behind the software, and they can have practiced procedures for handling large quantities of patches in an integrated way.
Of course, this does not preclude other people in the project from applying documentation patches on the fly, especially small ones, as time permits. And the same patch manager (see the section called “Patch Manager” earlier in this chapter) can track both code and documentation patches, filing them wherever the development and documentation teams want them, respectively. (If the total quantity of patches ever exceeds one human's capacity to track, though, switching to separate patch managers for code and documentation is probably a good first step.) The point of a documentation team is to have people who think of themselves as responsible for keeping the documentation organized, up-to-date, and consistent with itself. In practice, this means knowing the documentation intimately, watching the code base, watching the changes others commit to the documentation, watching for incoming documentation patches, and using all these information sources to do whatever is necessary to keep the documentation healthy.
The number of issues in a project's bug tracker grows in proportion to the number of people using the software. Therefore, even as you fix bugs and ship an increasingly robust program, you should still expect the number of open issues to grow essentially without bound. The frequency of duplicate issues will also increase, as will the frequency of incomplete or poorly described issues.
Issue managers help alleviate these problems by watching what goes into the database, and periodically sweeping through it looking for specific problems. Their most common action is probably to fix up incoming issues, either because the reporter didn't set some of the form fields correctly, or because the issue is a duplicate of one already in the database. Obviously, the more familiar an issue manager is with the project's bug database, the more efficiently she will be able to detect duplicate issues—this is one of the main advantages of having a few people specialize in the bug database, instead of everyone trying to do it ad hoc. When the group tries to do it in a decentralized manner, no single individual acquires a deep expertise in the content of the database.
Issue managers can also help map between issues and individual developers. When there are a lot of bug reports coming in, not every developer may read the issue notification mailing list with equal attention. However, if someone who knows the development team is keeping an eye on all incoming issues, then she can discreetly direct certain developers' attention to specific bugs when appropriate. Of course, this has to be done with a sensitivity to everything else going on in development, and to the recipient's desires and temperament. Therefore, it is often best for issue managers to be developers themselves.
Depending on how your project uses the issue tracker, issue managers can also shape the database to reflect the project's priorities. For example, in Subversion we schedule issues into specific future releases, so that when someone asks "When will bug X be fixed?" we can say "Two releases from now," even if we can't give an exact date. The releases are represented in the issue tracker as target milestones, a field available in IssueZilla. As a rule, every Subversion release has one major new feature and a list of specific bug fixes. We assign the appropriate target milestone to all the issues planned for that release (including the new feature—it gets an issue too), so that people can view the bug database through the lens of release scheduling. These targets rarely remain static, however. As new bugs come in, priorities sometimes get shifted around, and issues must be moved from one milestone to another so that each release remains manageable. This, again, is best done by people who have an overall sense of what's in the database, and how various issues relate to each other.
Another thing issue managers do is notice when issues become obsolete. Sometimes a bug is fixed accidentally as part of an unrelated change to the software, or sometimes the project changes its mind about whether a certain behavior is buggy. Finding obsoleted issues is not easy: the only way to do it systematically is by making a sweep over all the issues in the database. Full sweeps become less and less feasible over time, however, as the number of issues grows. After a certain point, the only way to keep the database sane is to use a divide-and-conquer approach: categorize issues immediately on arrival and direct them to the appropriate developer's or team's attention. The recipient then takes charge of the issue for the rest of its lifetime, shepherding it to resolution or oblivion as necessary. When the database is that large, the issue manager becomes more of an overall coordinator, spending less time looking at each issue herself and more time getting it into the right person's hands.
FAQ maintenance is a surprisingly difficult problem. Unlike most other documents in a project, whose content is planned out in advance by the authors, a FAQ is a wholly reactive document (see Maintaining a FAQ). No matter how big it gets, you still never know what the next addition will be. And because it is always added to piecemeal, it is very easy for the document as a whole to become incoherent and disorganized, and even to contain duplicate or semi-duplicate entries. Even when it does not have any obvious problems like that, there are often unnoticed interdependencies between items—links that should be made but aren't—because the related items were added a year apart.
The role of a FAQ manager is twofold. First, she maintains the overall quality of the FAQ by staying familiar with at least the topics of all the questions in it, so that when people add new items that are duplicates of, or related to, existing items, the appropriate adjustments can be made. Second, she watches the project mailing lists and other forums for recurring problems or questions, and to write new FAQ entries based on this input. This latter task can be quite complex: one must be able to follow a thread, recognize the core questions raised in it, post a proposed FAQ entry, incorporate comments from others (since it's impossible for the FAQ manager to be an expert in every topic covered by the FAQ), and sense when the process is finished so the item can at last be added.
The FAQ manager usually also becomes the default expert in FAQ formatting. There are a lot of little details involved in keeping a FAQ in shape (see the section called “Treat all resources like archives” in Chapter 6, Communications); when random people edit the FAQ, they will sometimes forget some of these details. That's okay, as long as the FAQ manager is there to clean up after them.
Various free software is available to help with the process of FAQ maintenance. It's fine to use it, as long as it doesn't compromise the quality of the FAQ, but beware of over-automation. Some projects try to fully automate the process of FAQ maintenance, allowing everyone to contribute and edit FAQ items in a manner similar to a wiki (see the section called “Wikis” in Chapter 3, Technical Infrastructure). I've seen this happen particularly with Faq-O-Matic (http://faqomatic.sourceforge.net/), though it may be that the cases I saw were simply abuses that went beyond what Faq-O-Matic was originally intended for. In any case, while complete decentralization of FAQ maintenance does reduce the workload for the project, it also results in a poorer FAQ. There's no one person with a broad view of the entire FAQ, no one to notice when certain items need updating or become obsolete entirely, and no one keeping watch for interdependencies between items. The result is a FAQ that often fails to provide users what they were looking for, and in the worst cases misleads them. Use whatever tools you need to maintain your project's FAQ, but never let the convenience of the tools seduce you into compromising the quality of the FAQ.
See Sean Michael Kerner's article, The FAQs on FAQs, at http://osdir.com/Article1722.phtml, for descriptions and evaluations of open source FAQ maintenance tools.
 IssueZilla is the issue tracker we use; it is a descendant of BugZilla.