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| <div class="section" id="module-apache_beam.io.watermark_estimators"> |
| <span id="apache-beam-io-watermark-estimators-module"></span><h1>apache_beam.io.watermark_estimators module<a class="headerlink" href="#module-apache_beam.io.watermark_estimators" title="Permalink to this headline">¶</a></h1> |
| <p>A collection of WatermarkEstimator implementations that SplittableDoFns |
| can use.</p> |
| <dl class="class"> |
| <dt id="apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.watermark_estimators.</code><code class="descname">MonotonicWatermarkEstimator</code><span class="sig-paren">(</span><em>timestamp</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#MonotonicWatermarkEstimator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.io.iobase.html#apache_beam.io.iobase.WatermarkEstimator" title="apache_beam.io.iobase.WatermarkEstimator"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.io.iobase.WatermarkEstimator</span></code></a></p> |
| <p>A WatermarkEstimator which assumes that timestamps of all ouput records |
| are increasing monotonically.</p> |
| <p>For a new <element, restriction> pair, the initial value is None. When |
| resuming processing, the initial timestamp will be the last reported |
| watermark.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.observe_timestamp"> |
| <code class="descname">observe_timestamp</code><span class="sig-paren">(</span><em>timestamp</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#MonotonicWatermarkEstimator.observe_timestamp"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.observe_timestamp" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.current_watermark"> |
| <code class="descname">current_watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#MonotonicWatermarkEstimator.current_watermark"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.current_watermark" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.get_estimator_state"> |
| <code class="descname">get_estimator_state</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#MonotonicWatermarkEstimator.get_estimator_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.get_estimator_state" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="staticmethod"> |
| <dt id="apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.default_provider"> |
| <em class="property">static </em><code class="descname">default_provider</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#MonotonicWatermarkEstimator.default_provider"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.MonotonicWatermarkEstimator.default_provider" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Provide a default WatermarkEstimatorProvider for |
| MonotonicWatermarkEstimator.</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.watermark_estimators.</code><code class="descname">WalltimeWatermarkEstimator</code><span class="sig-paren">(</span><em>timestamp=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#WalltimeWatermarkEstimator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.io.iobase.html#apache_beam.io.iobase.WatermarkEstimator" title="apache_beam.io.iobase.WatermarkEstimator"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.io.iobase.WatermarkEstimator</span></code></a></p> |
| <p>A WatermarkEstimator which uses processing time as the estimated watermark.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.observe_timestamp"> |
| <code class="descname">observe_timestamp</code><span class="sig-paren">(</span><em>timestamp</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#WalltimeWatermarkEstimator.observe_timestamp"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.observe_timestamp" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.current_watermark"> |
| <code class="descname">current_watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#WalltimeWatermarkEstimator.current_watermark"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.current_watermark" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.get_estimator_state"> |
| <code class="descname">get_estimator_state</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#WalltimeWatermarkEstimator.get_estimator_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.get_estimator_state" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="staticmethod"> |
| <dt id="apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.default_provider"> |
| <em class="property">static </em><code class="descname">default_provider</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#WalltimeWatermarkEstimator.default_provider"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.WalltimeWatermarkEstimator.default_provider" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Provide a default WatermarkEstimatorProvider for |
| WalltimeWatermarkEstimator.</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.watermark_estimators.</code><code class="descname">ManualWatermarkEstimator</code><span class="sig-paren">(</span><em>watermark</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.io.iobase.html#apache_beam.io.iobase.WatermarkEstimator" title="apache_beam.io.iobase.WatermarkEstimator"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.io.iobase.WatermarkEstimator</span></code></a></p> |
| <p>A WatermarkEstimator which is controlled manually from within a DoFn.</p> |
| <p>The DoFn must invoke set_watermark to advance the watermark.</p> |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator.observe_timestamp"> |
| <code class="descname">observe_timestamp</code><span class="sig-paren">(</span><em>timestamp</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator.observe_timestamp"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator.observe_timestamp" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator.current_watermark"> |
| <code class="descname">current_watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator.current_watermark"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator.current_watermark" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator.get_estimator_state"> |
| <code class="descname">get_estimator_state</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator.get_estimator_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator.get_estimator_state" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator.set_watermark"> |
| <code class="descname">set_watermark</code><span class="sig-paren">(</span><em>timestamp</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator.set_watermark"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator.set_watermark" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Sets a timestamp before or at the timestamps of all future elements |
| produced by the associated DoFn.</p> |
| <p>This can be approximate. If records are output that violate this guarantee, |
| they will be considered late, which will affect how they will be processed. |
| See <a class="reference external" href="https://beam.apache.org/documentation/programming-guide/#watermarks-and-late-data">https://beam.apache.org/documentation/programming-guide/#watermarks-and-late-data</a> |
| for more information on late data and how to handle it.</p> |
| <p>However, this value should be as late as possible. Downstream windows may |
| not be able to close until this watermark passes their end.</p> |
| </dd></dl> |
| |
| <dl class="staticmethod"> |
| <dt id="apache_beam.io.watermark_estimators.ManualWatermarkEstimator.default_provider"> |
| <em class="property">static </em><code class="descname">default_provider</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/watermark_estimators.html#ManualWatermarkEstimator.default_provider"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.watermark_estimators.ManualWatermarkEstimator.default_provider" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Provide a default WatermarkEstimatorProvider for |
| WalltimeWatermarkEstimator.</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| </div> |
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