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| <div class="section" id="module-apache_beam.runners.interactive.caching.write_cache"> |
| <span id="apache-beam-runners-interactive-caching-write-cache-module"></span><h1>apache_beam.runners.interactive.caching.write_cache module<a class="headerlink" href="#module-apache_beam.runners.interactive.caching.write_cache" title="Permalink to this headline">¶</a></h1> |
| <p>Module to write cache for PCollections being computed.</p> |
| <p>For internal use only; no backward-compatibility guarantees.</p> |
| <dl class="class"> |
| <dt id="apache_beam.runners.interactive.caching.write_cache.WriteCache"> |
| <em class="property">class </em><code class="descclassname">apache_beam.runners.interactive.caching.write_cache.</code><code class="descname">WriteCache</code><span class="sig-paren">(</span><em>pipeline: beam_runner_api_pb2.Pipeline</em>, <em>context: apache_beam.runners.pipeline_context.PipelineContext</em>, <em>cache_manager: apache_beam.runners.interactive.cache_manager.CacheManager</em>, <em>cacheable: apache_beam.runners.interactive.caching.cacheable.Cacheable</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/write_cache.html#WriteCache"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.write_cache.WriteCache" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.10)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Class that facilitates writing cache for PCollections being computed.</p> |
| <dl class="method"> |
| <dt id="apache_beam.runners.interactive.caching.write_cache.WriteCache.write_cache"> |
| <code class="descname">write_cache</code><span class="sig-paren">(</span><span class="sig-paren">)</span> → None<a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/write_cache.html#WriteCache.write_cache"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.write_cache.WriteCache.write_cache" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Writes cache for the cacheable PCollection that is being computed.</p> |
| <p>First, it creates a temporary pipeline instance on top of the existing |
| component_id_map from self._pipeline’s context so that both pipelines |
| share the context and have no conflict component ids. |
| Second, it creates a _PCollectionPlaceHolder in the temporary pipeline that |
| mimics the attributes of the cacheable PCollection to be written into cache. |
| It also marks all components in the current temporary pipeline as |
| ignorable when later copying components to self._pipeline. |
| Third, it instantiates a _WriteCacheTransform that uses the |
| _PCollectionPlaceHolder as the input. This adds a subgraph under top level |
| transforms that writes the _PCollectionPlaceHolder into cache. |
| Fourth, it copies components of the subgraph from the temporary pipeline to |
| self._pipeline, skipping components that are ignored in the temporary |
| pipeline and components that are not in the temporary pipeline but presents |
| in the component_id_map of self._pipeline. |
| Last, it replaces inputs of all transforms that consume the |
| _PCollectionPlaceHolder with the cacheable PCollection to be written to |
| cache.</p> |
| </dd></dl> |
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