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| <div class="section" id="module-apache_beam.io.gcp.datastore.v1new.query_splitter"> |
| <span id="apache-beam-io-gcp-datastore-v1new-query-splitter-module"></span><h1>apache_beam.io.gcp.datastore.v1new.query_splitter module<a class="headerlink" href="#module-apache_beam.io.gcp.datastore.v1new.query_splitter" title="Permalink to this headline">¶</a></h1> |
| <p>Implements a Cloud Datastore query splitter.</p> |
| <p>For internal use only. No backwards compatibility guarantees.</p> |
| <dl class="exception"> |
| <dt id="apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError"> |
| <em class="property">exception </em><code class="descclassname">apache_beam.io.gcp.datastore.v1new.query_splitter.</code><code class="descname">QuerySplitterError</code><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1new/query_splitter.html#QuerySplitterError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#Exception" title="(in Python v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Exception</span></code></a></p> |
| <p>Top-level error type.</p> |
| </dd></dl> |
| |
| <dl class="exception"> |
| <dt id="apache_beam.io.gcp.datastore.v1new.query_splitter.SplitNotPossibleError"> |
| <em class="property">exception </em><code class="descclassname">apache_beam.io.gcp.datastore.v1new.query_splitter.</code><code class="descname">SplitNotPossibleError</code><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1new/query_splitter.html#SplitNotPossibleError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1new.query_splitter.SplitNotPossibleError" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="#apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError" title="apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError</span></code></a></p> |
| <p>Raised when some parameter of the query does not allow splitting.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.io.gcp.datastore.v1new.query_splitter.get_splits"> |
| <code class="descclassname">apache_beam.io.gcp.datastore.v1new.query_splitter.</code><code class="descname">get_splits</code><span class="sig-paren">(</span><em>client</em>, <em>query</em>, <em>num_splits</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/gcp/datastore/v1new/query_splitter.html#get_splits"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.gcp.datastore.v1new.query_splitter.get_splits" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Returns a list of sharded queries for the given Cloud Datastore query.</p> |
| <p>This will create up to the desired number of splits, however it may return |
| less splits if the desired number of splits is unavailable. This will happen |
| if the number of split points provided by the underlying Datastore is less |
| than the desired number, which will occur if the number of results for the |
| query is too small.</p> |
| <p>This implementation of the QuerySplitter uses the __scatter__ property to |
| gather random split points for a query.</p> |
| <p>Note: This implementation is derived from the java query splitter in |
| <a class="reference external" href="https://github.com/GoogleCloudPlatform/google-cloud-datastore/blob/master/java/datastore/src/main/java/com/google/datastore/v1/client/QuerySplitterImpl.java">https://github.com/GoogleCloudPlatform/google-cloud-datastore/blob/master/java/datastore/src/main/java/com/google/datastore/v1/client/QuerySplitterImpl.java</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>client</strong> – the datastore client.</li> |
| <li><strong>query</strong> – the query to split.</li> |
| <li><strong>num_splits</strong> – the desired number of splits.</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A list of split queries, of a max length of <cite>num_splits</cite></p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><p class="first last"><a class="reference internal" href="#apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError" title="apache_beam.io.gcp.datastore.v1new.query_splitter.QuerySplitterError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">QuerySplitterError</span></code></a> – if split could not be performed owing to query or split |
| parameters.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </dd></dl> |
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