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| <div class="section" id="module-apache_beam.io.filebasedsource"> |
| <span id="apache-beam-io-filebasedsource-module"></span><h1>apache_beam.io.filebasedsource module<a class="headerlink" href="#module-apache_beam.io.filebasedsource" title="Permalink to this headline">¶</a></h1> |
| <p>A framework for developing sources for new file types.</p> |
| <p>To create a source for a new file type a sub-class of <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> |
| should be created. Sub-classes of <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> must implement the |
| method <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource.read_records" title="apache_beam.io.filebasedsource.FileBasedSource.read_records"><code class="xref py py-meth docutils literal notranslate"><span class="pre">FileBasedSource.read_records()</span></code></a>. Please read the documentation of |
| that method for more details.</p> |
| <p>For an example implementation of <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> see |
| <code class="xref py py-class docutils literal notranslate"><span class="pre">_AvroSource</span></code>.</p> |
| <dl class="class"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.filebasedsource.</code><code class="descname">FileBasedSource</code><span class="sig-paren">(</span><em>file_pattern</em>, <em>min_bundle_size=0</em>, <em>compression_type='auto'</em>, <em>splittable=True</em>, <em>validate=True</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.io.iobase.html#apache_beam.io.iobase.BoundedSource" title="apache_beam.io.iobase.BoundedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.io.iobase.BoundedSource</span></code></a></p> |
| <p>A <a class="reference internal" href="apache_beam.io.iobase.html#apache_beam.io.iobase.BoundedSource" title="apache_beam.io.iobase.BoundedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">BoundedSource</span></code></a> for reading a file glob of |
| a given type.</p> |
| <p>Initializes <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a>.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>file_pattern</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.8)"><em>str</em></a>) – the file glob to read a string or a |
| <a class="reference internal" href="apache_beam.options.value_provider.html#apache_beam.options.value_provider.ValueProvider" title="apache_beam.options.value_provider.ValueProvider"><code class="xref py py-class docutils literal notranslate"><span class="pre">ValueProvider</span></code></a> |
| (placeholder to inject a runtime value).</li> |
| <li><strong>min_bundle_size</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.8)"><em>int</em></a>) – minimum size of bundles that should be generated |
| when performing initial splitting on this source.</li> |
| <li><strong>compression_type</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.8)"><em>str</em></a>) – Used to handle compressed output files. |
| Typical value is <a class="reference internal" href="apache_beam.io.filesystem.html#apache_beam.io.filesystem.CompressionTypes.AUTO" title="apache_beam.io.filesystem.CompressionTypes.AUTO"><code class="xref py py-attr docutils literal notranslate"><span class="pre">CompressionTypes.AUTO</span></code></a>, |
| in which case the final file path’s extension will be used to detect |
| the compression.</li> |
| <li><strong>splittable</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.8)"><em>bool</em></a>) – whether <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> should try to |
| logically split a single file into data ranges so that different parts |
| of the same file can be read in parallel. If set to <a class="reference external" href="https://docs.python.org/3/library/constants.html#False" title="(in Python v3.8)"><code class="xref py py-data docutils literal notranslate"><span class="pre">False</span></code></a>, |
| <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> will prevent both initial and dynamic splitting |
| of sources for single files. File patterns that represent multiple files |
| may still get split into sources for individual files. Even if set to |
| <a class="reference external" href="https://docs.python.org/3/library/constants.html#True" title="(in Python v3.8)"><code class="xref py py-data docutils literal notranslate"><span class="pre">True</span></code></a> by the user, <a class="reference internal" href="#apache_beam.io.filebasedsource.FileBasedSource" title="apache_beam.io.filebasedsource.FileBasedSource"><code class="xref py py-class docutils literal notranslate"><span class="pre">FileBasedSource</span></code></a> may choose to not |
| split the file, for example, for compressed files where currently it is |
| not possible to efficiently read a data range without decompressing the |
| whole file.</li> |
| <li><strong>validate</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.8)"><em>bool</em></a>) – Boolean flag to verify that the files exist during the |
| pipeline creation time.</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple"> |
| <li><a class="reference external" href="https://docs.python.org/3/library/exceptions.html#TypeError" title="(in Python v3.8)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> – when <strong>compression_type</strong> is not valid or if |
| <strong>file_pattern</strong> is not a <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">str</span></code></a> or a |
| <a class="reference internal" href="apache_beam.options.value_provider.html#apache_beam.options.value_provider.ValueProvider" title="apache_beam.options.value_provider.ValueProvider"><code class="xref py py-class docutils literal notranslate"><span class="pre">ValueProvider</span></code></a>.</li> |
| <li><a class="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.8)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> – when compression and splittable files are |
| specified.</li> |
| <li><a class="reference external" href="https://docs.python.org/3/library/exceptions.html#IOError" title="(in Python v3.8)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a> – when the file pattern specified yields an empty |
| result.</li> |
| </ul> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.MIN_NUMBER_OF_FILES_TO_STAT"> |
| <code class="descname">MIN_NUMBER_OF_FILES_TO_STAT</code><em class="property"> = 100</em><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.MIN_NUMBER_OF_FILES_TO_STAT" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.MIN_FRACTION_OF_FILES_TO_STAT"> |
| <code class="descname">MIN_FRACTION_OF_FILES_TO_STAT</code><em class="property"> = 0.01</em><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.MIN_FRACTION_OF_FILES_TO_STAT" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.display_data"> |
| <code class="descname">display_data</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.display_data"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.display_data" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.open_file"> |
| <code class="descname">open_file</code><span class="sig-paren">(</span><em>file_name</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.open_file"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.open_file" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.split"> |
| <code class="descname">split</code><span class="sig-paren">(</span><em>desired_bundle_size=None</em>, <em>start_position=None</em>, <em>stop_position=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.split"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.split" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.estimate_size"> |
| <code class="descname">estimate_size</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.estimate_size"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.estimate_size" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.read"> |
| <code class="descname">read</code><span class="sig-paren">(</span><em>range_tracker</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.read"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.read" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.get_range_tracker"> |
| <code class="descname">get_range_tracker</code><span class="sig-paren">(</span><em>start_position</em>, <em>stop_position</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.get_range_tracker"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.get_range_tracker" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.read_records"> |
| <code class="descname">read_records</code><span class="sig-paren">(</span><em>file_name</em>, <em>offset_range_tracker</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/filebasedsource.html#FileBasedSource.read_records"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.read_records" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Returns a generator of records created by reading file ‘file_name’.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>file_name</strong> – a <code class="docutils literal notranslate"><span class="pre">string</span></code> that gives the name of the file to be read. Method |
| <code class="docutils literal notranslate"><span class="pre">FileBasedSource.open_file()</span></code> must be used to open the file |
| and create a seekable file object.</li> |
| <li><strong>offset_range_tracker</strong> – a object of type <code class="docutils literal notranslate"><span class="pre">OffsetRangeTracker</span></code>. This |
| defines the byte range of the file that should be |
| read. See documentation in |
| <code class="docutils literal notranslate"><span class="pre">iobase.BoundedSource.read()</span></code> for more information |
| on reading records while complying to the range |
| defined by a given <code class="docutils literal notranslate"><span class="pre">RangeTracker</span></code>.</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">an iterator that gives the records read from the given file.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.filebasedsource.FileBasedSource.splittable"> |
| <code class="descname">splittable</code><a class="headerlink" href="#apache_beam.io.filebasedsource.FileBasedSource.splittable" title="Permalink to this definition">¶</a></dt> |
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