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   <div class="section" id="module-apache_beam.io.gcp.datastore.v1.datastoreio">
 <span id="apache-beam-io-gcp-datastore-v1-datastoreio-module"></span><h1>apache_beam.io.gcp.datastore.v1.datastoreio module<a class="headerlink" href="#module-apache_beam.io.gcp.datastore.v1.datastoreio" title="Permalink to this headline">¶</a></h1>
 <p>A connector for reading from and writing to Google Cloud Datastore</p>
 <dl class="class">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore">
 <em class="property">class </em><code class="descclassname">apache_beam.io.gcp.datastore.v1.datastoreio.</code><code class="descname">ReadFromDatastore</code><span class="sig-paren">(</span><em>project</em>, <em>query</em>, <em>namespace=None</em>, <em>num_splits=0</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore" 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>A <code class="docutils literal"><span class="pre">PTransform</span></code> for reading from Google Cloud Datastore.</p>
 <p>To read a <code class="docutils literal"><span class="pre">PCollection[Entity]</span></code> from a Cloud Datastore <code class="docutils literal"><span class="pre">Query</span></code>, use
 <code class="docutils literal"><span class="pre">ReadFromDatastore</span></code> transform by providing a <cite>project</cite> id and a <cite>query</cite> to
 read from. You can optionally provide a <cite>namespace</cite> and/or specify how many
 splits you want for the query through <cite>num_splits</cite> option.</p>
 <p>Note: Normally, a runner will read from Cloud Datastore in parallel across
 many workers. However, when the <cite>query</cite> is configured with a <cite>limit</cite> or if the
 query contains inequality filters like <cite>GREATER_THAN, LESS_THAN</cite> etc., then
 all the returned results will be read by a single worker in order to ensure
 correct data. Since data is read from a single worker, this could have
 significant impact on the performance of the job.</p>
 <dl class="docutils">
 <dt>The semantics for the query splitting is defined below:</dt>
 <dd><p class="first">1. If <cite>num_splits</cite> is equal to 0, then the number of splits will be chosen
 dynamically at runtime based on the query data size.</p>
 <p>2. Any value of <cite>num_splits</cite> greater than
 <cite>ReadFromDatastore._NUM_QUERY_SPLITS_MAX</cite> will be capped at that value.</p>
 <p>3. If the <cite>query</cite> has a user limit set, or contains inequality filters, then
 <cite>num_splits</cite> will be ignored and no split will be performed.</p>
 <p class="last">4. Under certain cases Cloud Datastore is unable to split query to the
 requested number of splits. In such cases we just use whatever the Cloud
 Datastore returns.</p>
 </dd>
 </dl>
 <p>See <a class="reference external" href="https://developers.google.com/datastore/">https://developers.google.com/datastore/</a> for more details on Google Cloud
 Datastore.</p>
 <p>Initialize the <cite>ReadFromDatastore</cite> transform.</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 last simple">
 <li><strong>project</strong> – The ID of the project to read from.</li>
 <li><strong>query</strong> – Cloud Datastore query to be read from.</li>
 <li><strong>namespace</strong> – An optional namespace.</li>
 <li><strong>num_splits</strong> – Number of splits for the query.</li>
 </ul>
 </td>
 </tr>
 </tbody>
 </table>
 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.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/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.expand" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.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/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.display_data"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.display_data" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="class">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn">
 <em class="property">class </em><code class="descname">SplitQueryFn</code><span class="sig-paren">(</span><em>project</em>, <em>query</em>, <em>namespace</em>, <em>num_splits</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.SplitQueryFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.core.html#apache_beam.transforms.core.DoFn" title="apache_beam.transforms.core.DoFn"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.core.DoFn</span></code></a></p>
 <p>A <cite>DoFn</cite> that splits a given query into multiple sub-queries.</p>
 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.start_bundle">
 <code class="descname">start_bundle</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.SplitQueryFn.start_bundle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.start_bundle" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.process">
 <code class="descname">process</code><span class="sig-paren">(</span><em>query</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.SplitQueryFn.process"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.process" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.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/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.SplitQueryFn.display_data"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.SplitQueryFn.display_data" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn">
 <em class="property">class </em><code class="descname">ReadFn</code><span class="sig-paren">(</span><em>project</em>, <em>namespace=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.ReadFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.core.html#apache_beam.transforms.core.DoFn" title="apache_beam.transforms.core.DoFn"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.core.DoFn</span></code></a></p>
 <p>A DoFn that reads entities from Cloud Datastore, for a given query.</p>
 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.start_bundle">
 <code class="descname">start_bundle</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.ReadFn.start_bundle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.start_bundle" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.process">
 <code class="descname">process</code><span class="sig-paren">(</span><em>query</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.ReadFn.process"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.process" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.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/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.ReadFn.display_data"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.ReadFn.display_data" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 </dd></dl>

 <dl class="staticmethod">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.query_latest_statistics_timestamp">
 <em class="property">static </em><code class="descname">query_latest_statistics_timestamp</code><span class="sig-paren">(</span><em>project</em>, <em>namespace</em>, <em>datastore</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.query_latest_statistics_timestamp"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.query_latest_statistics_timestamp" title="Permalink to this definition">¶</a></dt>
 <dd><p>Fetches the latest timestamp of statistics from Cloud Datastore.</p>
 <p>Cloud Datastore system tables with statistics are periodically updated.
 This method fethes the latest timestamp (in microseconds) of statistics
 update using the <cite>__Stat_Total__</cite> table.</p>
 </dd></dl>

 <dl class="staticmethod">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.get_estimated_size_bytes">
 <em class="property">static </em><code class="descname">get_estimated_size_bytes</code><span class="sig-paren">(</span><em>project</em>, <em>namespace</em>, <em>query</em>, <em>datastore</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.get_estimated_size_bytes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.get_estimated_size_bytes" title="Permalink to this definition">¶</a></dt>
 <dd><p>Get the estimated size of the data returned by the given query.</p>
 <p>Cloud Datastore provides no way to get a good estimate of how large the
 result of a query is going to be. Hence we use the __Stat_Kind__ system
 table to get size of the entire kind as an approximate estimate, assuming
 exactly 1 kind is specified in the query.
 See <a class="reference external" href="https://cloud.google.com/datastore/docs/concepts/stats">https://cloud.google.com/datastore/docs/concepts/stats</a>.</p>
 </dd></dl>

 <dl class="staticmethod">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.get_estimated_num_splits">
 <em class="property">static </em><code class="descname">get_estimated_num_splits</code><span class="sig-paren">(</span><em>project</em>, <em>namespace</em>, <em>query</em>, <em>datastore</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#ReadFromDatastore.get_estimated_num_splits"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.ReadFromDatastore.get_estimated_num_splits" title="Permalink to this definition">¶</a></dt>
 <dd><p>Computes the number of splits to be performed on the given query.</p>
 </dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.WriteToDatastore">
 <em class="property">class </em><code class="descclassname">apache_beam.io.gcp.datastore.v1.datastoreio.</code><code class="descname">WriteToDatastore</code><span class="sig-paren">(</span><em>project</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#WriteToDatastore"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.WriteToDatastore" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">apache_beam.io.gcp.datastore.v1.datastoreio._Mutate</span></code></p>
 <p>A <code class="docutils literal"><span class="pre">PTransform</span></code> to write a <code class="docutils literal"><span class="pre">PCollection[Entity]</span></code> to Cloud Datastore.</p>
 <p>Initialize the <cite>WriteToDatastore</cite> transform.</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"><strong>project</strong> – The ID of the project to write to.</td>
 </tr>
 </tbody>
 </table>
 <dl class="staticmethod">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.WriteToDatastore.to_upsert_mutation">
 <em class="property">static </em><code class="descname">to_upsert_mutation</code><span class="sig-paren">(</span><em>entity</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#WriteToDatastore.to_upsert_mutation"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.WriteToDatastore.to_upsert_mutation" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.DeleteFromDatastore">
 <em class="property">class </em><code class="descclassname">apache_beam.io.gcp.datastore.v1.datastoreio.</code><code class="descname">DeleteFromDatastore</code><span class="sig-paren">(</span><em>project</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#DeleteFromDatastore"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.DeleteFromDatastore" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <code class="xref py py-class docutils literal"><span class="pre">apache_beam.io.gcp.datastore.v1.datastoreio._Mutate</span></code></p>
 <p>A <code class="docutils literal"><span class="pre">PTransform</span></code> to delete a <code class="docutils literal"><span class="pre">PCollection[Key]</span></code> from Cloud Datastore.</p>
 <p>Initialize the <cite>DeleteFromDatastore</cite> transform.</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"><strong>project</strong> – The ID of the project from which the entities will be deleted.</td>
 </tr>
 </tbody>
 </table>
 <dl class="staticmethod">
 <dt id="apache_beam.io.gcp.datastore.v1.datastoreio.DeleteFromDatastore.to_delete_mutation">
 <em class="property">static </em><code class="descname">to_delete_mutation</code><span class="sig-paren">(</span><em>key</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1/datastoreio.html#DeleteFromDatastore.to_delete_mutation"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1.datastoreio.DeleteFromDatastore.to_delete_mutation" title="Permalink to this definition">¶</a></dt>
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