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| <div class="section" id="module-apache_beam.io.fileio"> |
| <span id="apache-beam-io-fileio-module"></span><h1>apache_beam.io.fileio module<a class="headerlink" href="#module-apache_beam.io.fileio" title="Permalink to this headline">¶</a></h1> |
| <p><code class="docutils literal"><span class="pre">PTransforms</span></code> for manipulating files in Apache Beam.</p> |
| <p>Provides reading <code class="docutils literal"><span class="pre">PTransform</span></code>s, <code class="docutils literal"><span class="pre">MatchFiles</span></code>, |
| <code class="docutils literal"><span class="pre">MatchAll</span></code>, that produces a <code class="docutils literal"><span class="pre">PCollection</span></code> of records representing a file |
| and its metadata; and <code class="docutils literal"><span class="pre">ReadMatches</span></code>, which takes in a <code class="docutils literal"><span class="pre">PCollection</span></code> of file |
| metadata records, and produces a <code class="docutils literal"><span class="pre">PCollection</span></code> of <code class="docutils literal"><span class="pre">ReadableFile</span></code> objects. |
| These transforms currently do not support splitting by themselves.</p> |
| <div class="section" id="writing-to-files"> |
| <h2>Writing to Files<a class="headerlink" href="#writing-to-files" title="Permalink to this headline">¶</a></h2> |
| <p>The transforms in this file include <code class="docutils literal"><span class="pre">WriteToFiles</span></code>, which allows you to write |
| a <code class="docutils literal"><span class="pre">beam.PCollection</span></code> to files, and gives you many options to customize how to |
| do this.</p> |
| <p>The <code class="docutils literal"><span class="pre">WriteToFiles</span></code> transform supports bounded and unbounded PCollections |
| (i.e. it can be used both batch and streaming pipelines). For streaming |
| pipelines, it currently does not have support for multiple trigger firings |
| on the same window.</p> |
| <div class="section" id="file-naming"> |
| <h3>File Naming<a class="headerlink" href="#file-naming" title="Permalink to this headline">¶</a></h3> |
| <p>One of the parameters received by <code class="docutils literal"><span class="pre">WriteToFiles</span></code> is a function specifying how |
| to name the files that are written. This is a function that takes in the |
| following parameters:</p> |
| <ul class="simple"> |
| <li>window</li> |
| <li>pane</li> |
| <li>shard_index</li> |
| <li>total_shards</li> |
| <li>compression</li> |
| <li>destination</li> |
| </ul> |
| <p>It should return a file name that is unique for a combination of these |
| parameters.</p> |
| <p>The default naming strategy is to name files |
| in the format |
| <cite>$prefix-$start-$end-$pane-$shard-of-$numShards$suffix$compressionSuffix</cite>, |
| where:</p> |
| <ul class="simple"> |
| <li><cite>$prefix</cite> is, by default, <cite>“output”</cite>.</li> |
| <li><cite>$start</cite> and <cite>$end</cite> are the boundaries of the window for the data being |
| written. These are omitted if we’re using the Global window.</li> |
| <li><cite>$pane</cite> is the index for the number of firing for a window.</li> |
| <li><cite>$shard</cite> and <cite>$numShards</cite> are the current shard number, and the total number |
| of shards for this window firing.</li> |
| <li><cite>$suffix</cite> is, by default, an empty string, but it can be set by the user via |
| <code class="docutils literal"><span class="pre">default_file_naming</span></code>.</li> |
| </ul> |
| </div> |
| <div class="section" id="dynamic-destinations"> |
| <h3>Dynamic Destinations<a class="headerlink" href="#dynamic-destinations" title="Permalink to this headline">¶</a></h3> |
| <p>If the elements in the input <code class="docutils literal"><span class="pre">beam.PCollection</span></code> can be partitioned into groups |
| that should be treated differently (e.g. some events are to be stored as CSV, |
| while some others are to be stored as Avro files), it is possible to do this |
| by passing a <cite>destination</cite> parameter to <code class="docutils literal"><span class="pre">WriteToFiles</span></code>. Something like the |
| following:</p> |
| <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">my_pcollection</span> <span class="o">|</span> <span class="n">beam</span><span class="o">.</span><span class="n">io</span><span class="o">.</span><span class="n">fileio</span><span class="o">.</span><span class="n">WriteToFiles</span><span class="p">(</span> |
| <span class="n">path</span><span class="o">=</span><span class="s1">'/my/file/path'</span><span class="p">,</span> |
| <span class="n">destination</span><span class="o">=</span><span class="k">lambda</span> <span class="n">record</span><span class="p">:</span> <span class="s1">'avro'</span> <span class="k">if</span> <span class="n">record</span><span class="p">[</span><span class="s1">'type'</span><span class="p">]</span> <span class="o">==</span> <span class="s1">'A'</span> <span class="k">else</span> <span class="s1">'csv'</span><span class="p">,</span> |
| <span class="n">sink</span><span class="o">=</span><span class="k">lambda</span> <span class="n">dest</span><span class="p">:</span> <span class="n">AvroSink</span><span class="p">()</span> <span class="k">if</span> <span class="n">dest</span> <span class="o">==</span> <span class="s1">'avro'</span> <span class="k">else</span> <span class="n">CsvSink</span><span class="p">(),</span> |
| <span class="n">file_naming</span><span class="o">=</span><span class="n">beam</span><span class="o">.</span><span class="n">io</span><span class="o">.</span><span class="n">fileio</span><span class="o">.</span><span class="n">destination_prefix_naming</span><span class="p">())</span> |
| </pre></div> |
| </div> |
| <p>In this transform, depending on the type of a record, it will be written down to |
| a destination named <cite>‘avro’</cite>, or <cite>‘csv’</cite>. The value returned by the |
| <cite>destination</cite> call is then passed to the <cite>sink</cite> call, to determine what sort of |
| sink will be used for each destination. The return type of the <cite>destination</cite> |
| parameter can be anything, as long as elements can be grouped by it.</p> |
| <p>No backward compatibility guarantees. Everything in this module is experimental.</p> |
| <dl class="class"> |
| <dt id="apache_beam.io.fileio.EmptyMatchTreatment"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.fileio.</code><code class="descname">EmptyMatchTreatment</code><a class="reference internal" href="_modules/apache_beam/io/fileio.html#EmptyMatchTreatment"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.EmptyMatchTreatment" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/functions.html#object" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">object</span></code></a></p> |
| <p>How to treat empty matches in <code class="docutils literal"><span class="pre">MatchAll</span></code> and <code class="docutils literal"><span class="pre">MatchFiles</span></code> transforms.</p> |
| <p>If empty matches are disallowed, an error will be thrown if a pattern does not |
| match any files.</p> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.fileio.EmptyMatchTreatment.ALLOW"> |
| <code class="descname">ALLOW</code><em class="property"> = 'ALLOW'</em><a class="headerlink" href="#apache_beam.io.fileio.EmptyMatchTreatment.ALLOW" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.fileio.EmptyMatchTreatment.DISALLOW"> |
| <code class="descname">DISALLOW</code><em class="property"> = 'DISALLOW'</em><a class="headerlink" href="#apache_beam.io.fileio.EmptyMatchTreatment.DISALLOW" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.fileio.EmptyMatchTreatment.ALLOW_IF_WILDCARD"> |
| <code class="descname">ALLOW_IF_WILDCARD</code><em class="property"> = 'ALLOW_IF_WILDCARD'</em><a class="headerlink" href="#apache_beam.io.fileio.EmptyMatchTreatment.ALLOW_IF_WILDCARD" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="staticmethod"> |
| <dt id="apache_beam.io.fileio.EmptyMatchTreatment.allow_empty_match"> |
| <em class="property">static </em><code class="descname">allow_empty_match</code><span class="sig-paren">(</span><em>pattern</em>, <em>setting</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#EmptyMatchTreatment.allow_empty_match"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.EmptyMatchTreatment.allow_empty_match" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.fileio.MatchFiles"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.fileio.</code><code class="descname">MatchFiles</code><span class="sig-paren">(</span><em>file_pattern</em>, <em>empty_match_treatment='ALLOW_IF_WILDCARD'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#MatchFiles"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.MatchFiles" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p> |
| <p>Matches a file pattern using <code class="docutils literal"><span class="pre">FileSystems.match</span></code>.</p> |
| <p>This <code class="docutils literal"><span class="pre">PTransform</span></code> returns a <code class="docutils literal"><span class="pre">PCollection</span></code> of matching files in the form |
| of <code class="docutils literal"><span class="pre">FileMetadata</span></code> objects.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.MatchFiles.expand"> |
| <code class="descname">expand</code><span class="sig-paren">(</span><em>pcoll</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#MatchFiles.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.MatchFiles.expand" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.fileio.MatchAll"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.fileio.</code><code class="descname">MatchAll</code><span class="sig-paren">(</span><em>empty_match_treatment='ALLOW'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#MatchAll"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.MatchAll" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p> |
| <p>Matches file patterns from the input PCollection via <code class="docutils literal"><span class="pre">FileSystems.match</span></code>.</p> |
| <p>This <code class="docutils literal"><span class="pre">PTransform</span></code> returns a <code class="docutils literal"><span class="pre">PCollection</span></code> of matching files in the form |
| of <code class="docutils literal"><span class="pre">FileMetadata</span></code> objects.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.MatchAll.expand"> |
| <code class="descname">expand</code><span class="sig-paren">(</span><em>pcoll</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#MatchAll.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.MatchAll.expand" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.fileio.ReadableFile"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.fileio.</code><code class="descname">ReadableFile</code><span class="sig-paren">(</span><em>metadata</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadableFile"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadableFile" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/functions.html#object" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">object</span></code></a></p> |
| <p>A utility class for accessing files.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.ReadableFile.open"> |
| <code class="descname">open</code><span class="sig-paren">(</span><em>mime_type='text/plain'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadableFile.open"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadableFile.open" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.ReadableFile.read"> |
| <code class="descname">read</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadableFile.read"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadableFile.read" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.ReadableFile.read_utf8"> |
| <code class="descname">read_utf8</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadableFile.read_utf8"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadableFile.read_utf8" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.fileio.ReadMatches"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.fileio.</code><code class="descname">ReadMatches</code><span class="sig-paren">(</span><em>compression=None</em>, <em>skip_directories=True</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadMatches"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadMatches" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p> |
| <p>Converts each result of MatchFiles() or MatchAll() to a ReadableFile.</p> |
| <p>This helps read in a file’s contents or obtain a file descriptor.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.fileio.ReadMatches.expand"> |
| <code class="descname">expand</code><span class="sig-paren">(</span><em>pcoll</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/fileio.html#ReadMatches.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.fileio.ReadMatches.expand" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
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