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| |
| <div class="section" id="development-guidelines"> |
| <h1>Development Guidelines<a class="headerlink" href="#development-guidelines" title="Permalink to this headline">¶</a></h1> |
| <p>This section provides information for developers who wish to contribute to the |
| C++ codebase.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Since most of the project’s developers work on Linux or macOS, not all |
| features or developer tools are uniformly supported on Windows. If you are |
| on Windows, have a look at <a class="reference internal" href="windows.html#developers-cpp-windows"><span class="std std-ref">Developing on Windows</span></a>.</p> |
| </div> |
| <div class="section" id="compiler-warning-levels"> |
| <h2>Compiler warning levels<a class="headerlink" href="#compiler-warning-levels" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">BUILD_WARNING_LEVEL</span></code> CMake option switches between sets of predetermined |
| compiler warning levels that we use for code tidiness. For release builds, the |
| default warning level is <code class="docutils literal notranslate"><span class="pre">PRODUCTION</span></code>, while for debug builds the default is |
| <code class="docutils literal notranslate"><span class="pre">CHECKIN</span></code>.</p> |
| <p>When using <code class="docutils literal notranslate"><span class="pre">CHECKIN</span></code> for debug builds, <code class="docutils literal notranslate"><span class="pre">-Werror</span></code> is added when using gcc |
| and clang, causing build failures for any warning, and <code class="docutils literal notranslate"><span class="pre">/WX</span></code> is set with MSVC |
| having the same effect.</p> |
| </div> |
| <div class="section" id="running-unit-tests"> |
| <h2>Running unit tests<a class="headerlink" href="#running-unit-tests" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">-DARROW_BUILD_TESTS=ON</span></code> CMake option enables building of unit test |
| executables. You can then either run them individually, by launching the |
| desired executable, or run them all at once by launching the <code class="docutils literal notranslate"><span class="pre">ctest</span></code> |
| executable (which is part of the CMake suite).</p> |
| <p>A possible invocation is something like:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ ctest -j16 --output-on-failure |
| </pre></div> |
| </div> |
| <p>where the <code class="docutils literal notranslate"><span class="pre">-j16</span></code> option runs up to 16 tests in parallel, taking advantage |
| of multiple CPU cores and hardware threads.</p> |
| </div> |
| <div class="section" id="running-benchmarks"> |
| <h2>Running benchmarks<a class="headerlink" href="#running-benchmarks" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">-DARROW_BUILD_BENCHMARKS=ON</span></code> CMake option enables building of benchmark |
| executables. You can then run benchmarks individually by launching the |
| corresponding executable from the command line, e.g.:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ ./build/release/arrow-builder-benchmark |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>For meaningful benchmark numbers, it is very strongly recommended to build |
| in <code class="docutils literal notranslate"><span class="pre">Release</span></code> mode, so as to enable compiler optimizations.</p> |
| </div> |
| </div> |
| <div class="section" id="code-style-linting-and-ci"> |
| <h2>Code Style, Linting, and CI<a class="headerlink" href="#code-style-linting-and-ci" title="Permalink to this headline">¶</a></h2> |
| <p>This project follows <a class="reference external" href="https://google.github.io/styleguide/cppguide.html">Google’s C++ Style Guide</a> with minor exceptions:</p> |
| <ul class="simple"> |
| <li><p>We relax the line length restriction to 90 characters.</p></li> |
| <li><p>We use the <code class="docutils literal notranslate"><span class="pre">NULLPTR</span></code> macro in header files (instead of <code class="docutils literal notranslate"><span class="pre">nullptr</span></code>) defined |
| in <code class="docutils literal notranslate"><span class="pre">src/arrow/util/macros.h</span></code> to support building C++/CLI (ARROW-1134)</p></li> |
| <li><p>We relax the guide’s rules regarding structs. For public headers we should |
| use struct only for objects that are principally simple data containers where |
| it is OK to expose all the internal members and any methods are primarily |
| conveniences. For private headers the rules are relaxed further and structs |
| can be used where convenient for types that do not need access control even |
| though they may not be simple data containers.</p></li> |
| </ul> |
| <p>Our continuous integration builds on GitHub Actions run the unit test |
| suites on a variety of platforms and configuration, including using |
| Address Sanitizer and Undefined Behavior Sanitizer to check for various |
| patterns of misbehaviour such as memory leaks. In addition, the |
| codebase is subjected to a number of code style and code cleanliness checks.</p> |
| <p>In order to have a passing CI build, your modified git branch must pass the |
| following checks:</p> |
| <ul class="simple"> |
| <li><p>C++ builds with the project’s active version of <code class="docutils literal notranslate"><span class="pre">clang</span></code> without |
| compiler warnings with <code class="docutils literal notranslate"><span class="pre">-DBUILD_WARNING_LEVEL=CHECKIN</span></code>. Note that |
| there are classes of warnings (such as <code class="docutils literal notranslate"><span class="pre">-Wdocumentation</span></code>, see more |
| on this below) that are not caught by <code class="docutils literal notranslate"><span class="pre">gcc</span></code>.</p></li> |
| <li><p>CMake files pass style checks, can be fixed by running |
| <code class="docutils literal notranslate"><span class="pre">archery</span> <span class="pre">lint</span> <span class="pre">--cmake-format</span> <span class="pre">--fix</span></code>. This requires Python |
| 3 and <a class="reference external" href="https://github.com/cheshirekow/cmake_format">cmake_format</a> (note: |
| this currently does not work on Windows)</p></li> |
| <li><p>Passes various C++ (and others) style checks, checked with the <code class="docutils literal notranslate"><span class="pre">lint</span></code> |
| subcommand to <a class="reference internal" href="../archery.html#archery"><span class="std std-ref">Archery</span></a>. This can also be fixed locally |
| by running <code class="docutils literal notranslate"><span class="pre">archery</span> <span class="pre">lint</span> <span class="pre">--cpplint</span> <span class="pre">--fix</span></code>.</p></li> |
| </ul> |
| <p>In order to account for variations in the behavior of <code class="docutils literal notranslate"><span class="pre">clang-format</span></code> between |
| major versions of LLVM, we pin the version of <code class="docutils literal notranslate"><span class="pre">clang-format</span></code> used (current |
| LLVM 8).</p> |
| <p>Depending on how you installed clang-format, the build system may not be able |
| to find it. You can provide an explicit path to your LLVM installation (or the |
| root path for the clang tools) with the environment variable |
| <cite>$CLANG_TOOLS_PATH</cite> or by passing <code class="docutils literal notranslate"><span class="pre">-DClangTools_PATH=$PATH_TO_CLANG_TOOLS</span></code> when |
| invoking CMake.</p> |
| <p>To make linting more reproducible for everyone, we provide a <code class="docutils literal notranslate"><span class="pre">docker-compose</span></code> |
| target that is executable from the root of the repository:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>docker-compose run ubuntu-lint |
| </pre></div> |
| </div> |
| <div class="section" id="cleaning-includes-with-include-what-you-use-iwyu"> |
| <h3>Cleaning includes with include-what-you-use (IWYU)<a class="headerlink" href="#cleaning-includes-with-include-what-you-use-iwyu" title="Permalink to this headline">¶</a></h3> |
| <p>We occasionally use Google’s <a class="reference external" href="https://github.com/include-what-you-use/include-what-you-use">include-what-you-use</a> tool, also |
| known as IWYU, to remove unnecessary imports.</p> |
| <p>To begin using IWYU, you must first build it by following the instructions in |
| the project’s documentation. Once the <code class="docutils literal notranslate"><span class="pre">include-what-you-use</span></code> executable is in |
| your <code class="docutils literal notranslate"><span class="pre">$PATH</span></code>, you must run CMake with <code class="docutils literal notranslate"><span class="pre">-DCMAKE_EXPORT_COMPILE_COMMANDS=ON</span></code> |
| in a new out-of-source CMake build directory like so:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>mkdir -p <span class="nv">$ARROW_ROOT</span>/cpp/iwyu |
| <span class="nb">cd</span> <span class="nv">$ARROW_ROOT</span>/cpp/iwyu |
| cmake -DCMAKE_EXPORT_COMPILE_COMMANDS<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_PYTHON<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_PARQUET<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_FLIGHT<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_PLASMA<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_GANDIVA<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_BUILD_BENCHMARKS<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_BUILD_BENCHMARKS_REFERENCE<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_BUILD_TESTS<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_BUILD_UTILITIES<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_S3<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_BROTLI<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_BZ2<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_LZ4<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_SNAPPY<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_ZLIB<span class="o">=</span>ON <span class="se">\</span> |
| -DARROW_WITH_ZSTD<span class="o">=</span>ON .. |
| </pre></div> |
| </div> |
| <p>In order for IWYU to run on the desired component in the codebase, it must be |
| enabled by the CMake configuration flags. Once this is done, you can run IWYU |
| on the whole codebase by running a helper <code class="docutils literal notranslate"><span class="pre">iwyu.sh</span></code> script:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nv">IWYU_SH</span><span class="o">=</span><span class="nv">$ARROW_ROOT</span>/cpp/build-support/iwyu/iwyu.sh |
| ./<span class="nv">$IWYU_SH</span> |
| </pre></div> |
| </div> |
| <p>Since this is very time consuming, you can check a subset of files matching |
| some string pattern with the special “match” option</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>./<span class="nv">$IWYU_SH</span> match <span class="nv">$PATTERN</span> |
| </pre></div> |
| </div> |
| <p>For example, if you wanted to do IWYU checks on all files in |
| <code class="docutils literal notranslate"><span class="pre">src/arrow/array</span></code>, you could run</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>./<span class="nv">$IWYU_SH</span> match arrow/array |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="checking-for-abi-and-api-stability"> |
| <h3>Checking for ABI and API stability<a class="headerlink" href="#checking-for-abi-and-api-stability" title="Permalink to this headline">¶</a></h3> |
| <p>To build ABI compliance reports, you need to install the two tools |
| <code class="docutils literal notranslate"><span class="pre">abi-dumper</span></code> and <code class="docutils literal notranslate"><span class="pre">abi-compliance-checker</span></code>.</p> |
| <p>Build Arrow C++ in Debug mode, alternatively you could use <code class="docutils literal notranslate"><span class="pre">-Og</span></code> which also |
| builds with the necessary symbols but includes a bit of code optimization. |
| Once the build has finished, you can generate ABI reports using:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>abi-dumper -lver <span class="m">9</span> debug/libarrow.so -o ABI-9.dump |
| </pre></div> |
| </div> |
| <p>The above version number is freely selectable. As we want to compare versions, |
| you should now <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">checkout</span></code> the version you want to compare it to and re-run |
| the above command using a different version number. Once both reports are |
| generated, you can build a comparison report using</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>abi-compliance-checker -l libarrow -d1 ABI-PY-9.dump -d2 ABI-PY-10.dump |
| </pre></div> |
| </div> |
| <p>The report is then generated in <code class="docutils literal notranslate"><span class="pre">compat_reports/libarrow</span></code> as a HTML.</p> |
| </div> |
| </div> |
| <div class="section" id="api-documentation"> |
| <h2>API Documentation<a class="headerlink" href="#api-documentation" title="Permalink to this headline">¶</a></h2> |
| <p>We use Doxygen style comments (<code class="docutils literal notranslate"><span class="pre">///</span></code>) in header files for comments |
| that we wish to show up in API documentation for classes and |
| functions.</p> |
| <p>When using <code class="docutils literal notranslate"><span class="pre">clang</span></code> and building with |
| <code class="docutils literal notranslate"><span class="pre">-DBUILD_WARNING_LEVEL=CHECKIN</span></code>, the <code class="docutils literal notranslate"><span class="pre">-Wdocumentation</span></code> flag is |
| used which checks for some common documentation inconsistencies, like |
| documenting some, but not all function parameters with <code class="docutils literal notranslate"><span class="pre">\param</span></code>. See |
| the <a class="reference external" href="https://releases.llvm.org/7.0.1/tools/clang/docs/DiagnosticsReference.html#wdocumentation">LLVM documentation warnings section</a> |
| for more about this.</p> |
| <p>While we publish the API documentation as part of the main Sphinx-based |
| documentation site, you can also build the C++ API documentation anytime using |
| Doxygen. Run the following command from the <code class="docutils literal notranslate"><span class="pre">cpp/apidoc</span></code> directory:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>doxygen Doxyfile |
| </pre></div> |
| </div> |
| <p>This requires <a class="reference external" href="https://www.doxygen.org">Doxygen</a> to be installed.</p> |
| </div> |
| <div class="section" id="apache-parquet-development"> |
| <h2>Apache Parquet Development<a class="headerlink" href="#apache-parquet-development" title="Permalink to this headline">¶</a></h2> |
| <p>To build the C++ libraries for Apache Parquet, add the flag |
| <code class="docutils literal notranslate"><span class="pre">-DARROW_PARQUET=ON</span></code> when invoking CMake. |
| To build Apache Parquet with encryption support, add the flag |
| <code class="docutils literal notranslate"><span class="pre">-DPARQUET_REQUIRE_ENCRYPTION=ON</span></code> when invoking CMake. The Parquet libraries and unit tests |
| can be built with the <code class="docutils literal notranslate"><span class="pre">parquet</span></code> make target:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>make parquet |
| </pre></div> |
| </div> |
| <p>On Linux and macOS if you do not have Apache Thrift installed on your system, |
| or you are building with <code class="docutils literal notranslate"><span class="pre">-DThrift_SOURCE=BUNDLED</span></code>, you must install |
| <code class="docutils literal notranslate"><span class="pre">bison</span></code> and <code class="docutils literal notranslate"><span class="pre">flex</span></code> packages. On Windows we handle these build dependencies |
| automatically when building Thrift from source.</p> |
| <p>Running <code class="docutils literal notranslate"><span class="pre">ctest</span> <span class="pre">-L</span> <span class="pre">unittest</span></code> will run all built C++ unit tests, while <code class="docutils literal notranslate"><span class="pre">ctest</span> <span class="pre">-L</span> |
| <span class="pre">parquet</span></code> will run only the Parquet unit tests. The unit tests depend on an |
| environment variable <code class="docutils literal notranslate"><span class="pre">PARQUET_TEST_DATA</span></code> that depends on a git submodule to the |
| repository <a class="reference external" href="https://github.com/apache/parquet-testing">https://github.com/apache/parquet-testing</a>:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>git submodule update --init |
| <span class="nb">export</span> <span class="nv">PARQUET_TEST_DATA</span><span class="o">=</span><span class="nv">$ARROW_ROOT</span>/cpp/submodules/parquet-testing/data |
| </pre></div> |
| </div> |
| <p>Here <code class="docutils literal notranslate"><span class="pre">$ARROW_ROOT</span></code> is the absolute path to the Arrow codebase.</p> |
| </div> |
| <div class="section" id="arrow-flight-rpc"> |
| <h2>Arrow Flight RPC<a class="headerlink" href="#arrow-flight-rpc" title="Permalink to this headline">¶</a></h2> |
| <p>In addition to the Arrow dependencies, Flight requires:</p> |
| <ul class="simple"> |
| <li><p>gRPC (>= 1.14, roughly)</p></li> |
| <li><p>Protobuf (>= 3.6, earlier versions may work)</p></li> |
| <li><p>c-ares (used by gRPC)</p></li> |
| </ul> |
| <p>By default, Arrow will try to download and build these dependencies |
| when building Flight.</p> |
| <p>The optional <code class="docutils literal notranslate"><span class="pre">flight</span></code> libraries and tests can be built by passing |
| <code class="docutils literal notranslate"><span class="pre">-DARROW_FLIGHT=ON</span></code>.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>cmake .. -DARROW_FLIGHT<span class="o">=</span>ON -DARROW_BUILD_TESTS<span class="o">=</span>ON |
| make |
| </pre></div> |
| </div> |
| <p>You can also use existing installations of the extra dependencies. |
| When building, set the environment variables <code class="docutils literal notranslate"><span class="pre">gRPC_ROOT</span></code> and/or |
| <code class="docutils literal notranslate"><span class="pre">Protobuf_ROOT</span></code> and/or <code class="docutils literal notranslate"><span class="pre">c-ares_ROOT</span></code>.</p> |
| <p>We are developing against recent versions of gRPC, and the versions. The |
| <code class="docutils literal notranslate"><span class="pre">grpc-cpp</span></code> package available from <a class="reference external" href="https://conda-forge.org/">https://conda-forge.org/</a> is one reliable |
| way to obtain gRPC in a cross-platform way. You may try using system libraries |
| for gRPC and Protobuf, but these are likely to be too old. On macOS, you can |
| try <a class="reference external" href="https://brew.sh/">Homebrew</a>:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>brew install grpc |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| |
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