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| |
| <section id="reviewing-contributions"> |
| <h1>Reviewing contributions<a class="headerlink" href="#reviewing-contributions" title="Permalink to this heading">¶</a></h1> |
| <section id="principles"> |
| <h2>Principles<a class="headerlink" href="#principles" title="Permalink to this heading">¶</a></h2> |
| <p>Arrow is a foundational project that will need to evolve over many years |
| or even decades, while serving potentially millions of users. We believe |
| that being meticulous when reviewing brings greater rewards to the project |
| than being lenient and aiming for quick merges.</p> |
| <p>Code reviews like this lead to better quality code, more people who are |
| engaged with and understand the code being changed, and a generally |
| healthier project with more room to grow and accommodate emerging needs.</p> |
| </section> |
| <section id="guidelines"> |
| <h2>Guidelines<a class="headerlink" href="#guidelines" title="Permalink to this heading">¶</a></h2> |
| <section id="meta"> |
| <h3>Meta<a class="headerlink" href="#meta" title="Permalink to this heading">¶</a></h3> |
| <p><strong>Use your own judgement</strong>. These guidelines are not hard rules. |
| Committers are expected to have sufficient expertise on their work |
| areas to be able to adjust their approach based on any concerns they have.</p> |
| <p>These guidelines are not listed in a particular order and are not intended |
| to be used as a checklist.</p> |
| <p>Finally, these guidelines are not exhaustive.</p> |
| </section> |
| <section id="scope-and-completeness"> |
| <h3>Scope and completeness<a class="headerlink" href="#scope-and-completeness" title="Permalink to this heading">¶</a></h3> |
| <ul class="simple"> |
| <li><p>Our general policy is to not introduce regressions or merge PRs that require |
| follow-ons to function correctly (though exceptions to this can be made). |
| Making necessary changes after a merge is more costly both for the |
| contributor and the reviewer, but also for other developers who may be |
| confused if they hit problems introduced by a merged PR.</p></li> |
| <li><p>What changes are in-scope for a PR and what changes might/could/should be |
| pushed out of scope and have a follow-up issue created should be determined |
| in collaboration between the authors and the reviewers.</p></li> |
| <li><p>When a large piece of functionality is being contributed and it seems |
| desirable to integrate it piecewise, favour functional cohesion when |
| deciding how to divide changes (for example, if a filesystem implementation |
| is being contributed, a first PR may contribute directory metadata |
| operations, a second PR file reading facilities and a third PR file writing |
| facilities).</p></li> |
| </ul> |
| </section> |
| <section id="public-api-design"> |
| <h3>Public API design<a class="headerlink" href="#public-api-design" title="Permalink to this heading">¶</a></h3> |
| <ul class="simple"> |
| <li><p>Public APIs should nudge users towards the most desirable constructs. |
| In other words, if there is a “best” way to do something, it should |
| ideally also be the most easily discoverable and the most concise to type. |
| For example, safe APIs should be featured more prominently than |
| unsafe APIs that may crash or silently produce erroneous results on |
| invalid input.</p></li> |
| <li><p>Public APIs should ideally tend to produce readable code. One example |
| is when multiple options are expected to be added over time: it is better |
| to try to organize options logically rather than juxtapose them all in |
| a function’s signature (see for example the CSV reading APIs in |
| <a class="reference internal" href="../cpp/api/formats.html#cpp-api-csv"><span class="std std-ref">C++</span></a> and <a class="reference internal" href="../python/api/formats.html#py-api-csv"><span class="std std-ref">Python</span></a>).</p></li> |
| <li><p>Naming is important. Try to ask yourself if code calling the new API |
| would be understandable without having to read the API docs. |
| Vague naming should be avoided; inaccurate naming is even worse as it |
| can mislead the reader and lead to buggy user code.</p></li> |
| <li><p>Be mindful of terminology. Every project has (explicitly or tacitly) set |
| conventions about how to name important concepts; steering away from those |
| conventions increases the cognitive workload both for contributors and |
| users of the project. Conversely, reusing a well-known term for a different |
| purpose than usual can also increase the cognitive workload and make |
| developers’ lives more difficult.</p></li> |
| <li><p>If you are unsure whether an API is the right one for the task at hand, |
| it is advisable to mark it experimental, such that users know that it |
| may be changed over time, while contributors are less wary of bringing |
| code-breaking improvements. However, experimental APIs should not be |
| used as an excuse for eschewing basic API design principles.</p></li> |
| </ul> |
| </section> |
| <section id="robustness"> |
| <h3>Robustness<a class="headerlink" href="#robustness" title="Permalink to this heading">¶</a></h3> |
| <ul class="simple"> |
| <li><p>Arrow is a set of open source libraries that will be used in a very wide |
| array of contexts (including fiddling with deliberately artificial data |
| at a Jupyter interpreter prompt). If you are writing a public API, make |
| sure that it won’t crash or produce undefined behaviour on unusual (but |
| valid) inputs.</p></li> |
| <li><p>When a non-trivial algorithm is implemented, defensive coding can |
| be useful to catch potential problems (such as debug-only assertions, if |
| the language allows them).</p></li> |
| <li><p>APIs ingesting potentially untrusted data, such as on-disk file formats, |
| should try to avoid crashing or produce silent bugs when invalid or |
| corrupt data is fed to them. This can require a lot of care that is |
| out of the scope of regular code reviews (such as setting up |
| <a class="reference internal" href="cpp/fuzzing.html#cpp-fuzzing"><span class="std std-ref">fuzz testing</span></a>), but basic checks can still be |
| suggested at the code review stage.</p></li> |
| <li><p>When calling foreign APIs, especially system functions or APIs dealing with |
| input / output, do check for errors and propagate them (if the language |
| does not propagate errors automatically, such as C++).</p></li> |
| </ul> |
| </section> |
| <section id="performance"> |
| <h3>Performance<a class="headerlink" href="#performance" title="Permalink to this heading">¶</a></h3> |
| <ul> |
| <li><p>Think about performance, but do not obsess over it. Algorithmic complexity |
| is important if input size may be “large” (the meaning of large depends |
| on the context: use your own expertise to decide!). Micro-optimizations |
| improving performance by 20% or more on performance-sensitive functionality |
| may be useful as well; lesser micro-optimizations may not be worth the |
| time spent on them, especially if they lead to more complicated code.</p></li> |
| <li><p>If performance is important, measure it. Do not satisfy yourself with |
| guesses and intuitions (which may be founded on incorrect assumptions |
| about the compiler or the hardware).</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p><a class="reference internal" href="benchmarks.html#benchmarks"><span class="std std-ref">Benchmarking Arrow</span></a></p> |
| </div> |
| </li> |
| <li><p>Try to avoid trying to trick the compiler/interpreter/runtime by writing |
| the code in a certain way, unless it’s really important. These tricks |
| are generally brittle and dependent on platform details that may become |
| obsolete, and they can make code harder to maintain (a common question |
| that can block contributors is “what should I do about this weird hack |
| that my changes would like to remove”?).</p></li> |
| <li><p>Avoiding rough edges or degenerate behaviour (such as memory blowups when |
| a size estimate is inaccurately large) may be more important than trying to |
| improve the common case by a small amount.</p></li> |
| </ul> |
| </section> |
| <section id="documentation"> |
| <h3>Documentation<a class="headerlink" href="#documentation" title="Permalink to this heading">¶</a></h3> |
| <p>These guidelines should ideally apply to both prose documentation and |
| in-code docstrings.</p> |
| <ul class="simple"> |
| <li><p>Look for ambiguous / poorly informative wording. For example, <em>“it is an |
| error if …”</em> is less informative than either <em>“An error is raised if … “</em> |
| or <em>“Behaviour is undefined if …”</em> (the first phrasing doesn’t tell the |
| reader what actually <em>happens</em> on such an error).</p></li> |
| <li><p>When reviewing documentation changes (or prose snippets, in general), |
| be mindful about spelling, grammar, expression, and concision. Clear |
| communication is essential for effective collaboration with people |
| from a wide range of backgrounds, and contributes to better documentation.</p></li> |
| <li><p>Some contributors do not have English as a native language (and perhaps |
| neither do you). It is advised to help them and/or ask for external help |
| if needed.</p></li> |
| <li><p>Cross-linking increases the global value of documentation. Sphinx especially |
| has great cross-linking capabilities (including topic references, glossary |
| terms, API references), so be sure to make use of them!</p></li> |
| </ul> |
| </section> |
| <section id="testing"> |
| <h3>Testing<a class="headerlink" href="#testing" title="Permalink to this heading">¶</a></h3> |
| <ul class="simple"> |
| <li><p>When adding an API, all nominal cases should have test cases. Does a function |
| allow null values? Then null values should be tested (alongside non-null |
| values, of course). Does a function allow different input types? etc.</p></li> |
| <li><p>If some aspect of a functionality is delicate (either by definition or |
| as an implementation detail), it should be tested.</p></li> |
| <li><p>Corner cases should be exercised, especially in low-level implementation |
| languages such as C++. Examples: empty arrays, zero-chunk arrays, arrays |
| with only nulls, etc.</p></li> |
| <li><p>Stress tests can be useful, for example to uncover synchronizations bugs |
| if non-trivial parallelization is being added, or to validate a computational |
| argument against a slow and straightforward reference implementation.</p></li> |
| <li><p>A mitigating concern, however, is the overall cost of running the test |
| suite. Continuous Integration (CI) runtimes can be painfully long and |
| we should be wary of increasing them too much. Sometimes it is |
| worthwhile to fine-tune testing parameters to balance the usefulness |
| of tests against the cost of running them (especially where stress tests |
| are involved, since they tend to imply execution over large datasets).</p></li> |
| </ul> |
| </section> |
| </section> |
| <section id="social-aspects"> |
| <h2>Social aspects<a class="headerlink" href="#social-aspects" title="Permalink to this heading">¶</a></h2> |
| <ul class="simple"> |
| <li><p>Reviewing is a communication between the contributor and the reviewer. |
| Avoid letting questions or comments remain unanswered for too long |
| (“too long” is of course very subjective, but two weeks can be a reasonable |
| heuristic). If you cannot allocate time soon, do say it explicitly. |
| If you don’t have the answer to a question, do say it explicitly. |
| Saying <em>“I don’t have time immediately but I will come back later, |
| feel free to ping if I seem to have forgotten”</em> or <em>“Sorry, I am out of |
| my depth here”</em> is always better than saying nothing and leaving the |
| other person wondering.</p></li> |
| <li><p>If you know someone who has the competence to help on a blocking issue |
| and past experience suggests they may be willing to do so, feel free to |
| add them to the discussion (for example by gently pinging their Github |
| handle).</p></li> |
| <li><p>If the contributor has stopped giving feedback or updating their PR, |
| perhaps they’re not interested any more, but perhaps also they’re stuck |
| on some issue and feel unable to push their contribution any further. |
| Don’t hesitate to ask (<em>“I see this PR hasn’t seen any updates recently, |
| are you stuck on something? Do you need any help?”</em>).</p></li> |
| <li><p>If the contribution is genuinely desirable and the contributor is not making |
| any progress, it is also possible to take it up. Out of politeness, |
| it is however better to ask the contributor first.</p></li> |
| <li><p>Some contributors are looking for a quick fix to a specific problem and |
| don’t want to spend too much time on it. Others on the contrary are eager |
| to learn and improve their contribution to make it conform to the |
| project’s standards. The latter kind of contributors are especially |
| valuable as they may become long-term contributors or even committers |
| to the project.</p></li> |
| <li><p>Some contributors may respond <em>“I will fix it later, can we merge anyway?”</em> |
| when a problem is pointed out to them. Unfortunately, whether the fix will |
| really be contributed soon in a later PR is difficult to predict or enforce. |
| If the contributor has previously demonstrated that they are reliable, |
| it may be acceptable to do as suggested. Otherwise, it is better to |
| decline the suggestion.</p></li> |
| <li><p>If a PR is generally ready for merge apart from trivial or uncontroversial |
| concerns, the reviewer may decide to push changes themselves to the |
| PR instead of asking the contributor to make the changes.</p></li> |
| <li><p>Ideally, contributing code should be a rewarding process. Of course, |
| it will not always be, but we should strive to reduce contributor |
| frustration while keeping the above issues in mind.</p></li> |
| <li><p>Like any communication, code reviews are governed by the Apache |
| <a class="reference external" href="https://www.apache.org/foundation/policies/conduct.html">Code of Conduct</a>. |
| This applies to both reviewers and contributors.</p></li> |
| </ul> |
| </section> |
| <section id="labelling"> |
| <h2>Labelling<a class="headerlink" href="#labelling" title="Permalink to this heading">¶</a></h2> |
| <p>While reviewing PRs, we should try to identify whether the corresponding issue |
| needs to be marked with one or both of the following issue labels:</p> |
| <ul class="simple"> |
| <li><p><strong>Critical Fix</strong>: The change fixes either: (a) a security vulnerability; |
| (b) a bug that causes incorrect or invalid data to be produced; |
| or (c) a bug that causes a crash (while the API contract is upheld). |
| This is intended to mark fixes to issues that may affect users without their |
| knowledge. For this reason, fixing bugs that cause errors don’t count, since |
| those bugs are usually obvious. Bugs that cause crashes are considered critical |
| because they are a possible vector of Denial-of-Service attacks.</p></li> |
| <li><p><strong>Breaking Change</strong>: The change breaks backwards compatibility in a public API. |
| For changes in C++, this does not include changes that simply break ABI |
| compatibility, except for the few places where we do guarantee ABI |
| compatibility (such as C Data Interface). Experimental APIs are <em>not</em> |
| exempt from this; they are just more likely to be associated with this tag.</p></li> |
| </ul> |
| <p>Breaking changes and critical fixes are separate: breaking changes alter the |
| API contract, while critical fixes make the implementation align with the |
| existing API contract. For example, fixing a bug that caused a Parquet reader |
| to skip rows containing the number 42 is a critical fix but not a breaking change, |
| since the row skipping wasn’t behavior a reasonable user would rely on.</p> |
| <p>These labels are used in the release to highlight changes that users ought to be |
| aware of when they consider upgrading library versions. Breaking changes help |
| identify reasons when users may wish to wait to upgrade until they have time to |
| adapt their code, while critical fixes highlight the risk in <em>not</em> upgrading.</p> |
| <p>In addition, we use the following labels to indicate priority:</p> |
| <ul class="simple"> |
| <li><p><strong>Priority: Blocker</strong>: Indicates the changes <strong>must</strong> be merged before the next |
| release can happen. This includes fixes to test or packaging failures that |
| would prevent the release from succeeding final packaging or verification.</p></li> |
| <li><p><strong>Priority: Critical</strong>: Indicates issues that are high priority. This is a |
| superset of issues marked “Critical Fix”, as it also contains certain fixes |
| to issues causing errors and crashes.</p></li> |
| </ul> |
| </section> |
| <section id="collaborators"> |
| <h2>Collaborators<a class="headerlink" href="#collaborators" title="Permalink to this heading">¶</a></h2> |
| <p>The collaborator role allows users to be given triage role to be able to help triaging |
| issues. The role allows users to label and assign issues.</p> |
| <p>A user can ask to become a collaborator or can be proposed by another community member |
| when they have been collaborating in the project for a period of time. Collaborations |
| can be but are not limited to: creating PRs, answering questions, creating |
| issues, reviewing PRs, etcetera.</p> |
| <p>In order to propose someone as a collaborator you must create a PR adding the user to |
| the collaborators list on <a class="reference external" href="https://github.com/apache/arrow/blob/main/.asf.yaml">.asf.yaml</a>. |
| Committers can review the past collaborations for the user and approve.</p> |
| <p>Collaborators that have been inactive for a period of time can be removed from the |
| list of collaborators.</p> |
| </section> |
| </section> |
| |
| |
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