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| <section id="module-apache_beam.runners.interactive.caching.read_cache"> |
| <span id="apache-beam-runners-interactive-caching-read-cache-module"></span><h1>apache_beam.runners.interactive.caching.read_cache module<a class="headerlink" href="#module-apache_beam.runners.interactive.caching.read_cache" title="Link to this heading"></a></h1> |
| <p>Module to read cache of computed PCollections.</p> |
| <p>For internal use only; no backward-compatibility guarantees.</p> |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="apache_beam.runners.interactive.caching.read_cache.ReadCache"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">apache_beam.runners.interactive.caching.read_cache.</span></span><span class="sig-name descname"><span class="pre">ReadCache</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pipeline</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Pipeline</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">context</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext" title="apache_beam.runners.pipeline_context.PipelineContext"><span class="pre">PipelineContext</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">cache_manager</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.interactive.cache_manager.html#apache_beam.runners.interactive.cache_manager.CacheManager" title="apache_beam.runners.interactive.cache_manager.CacheManager"><span class="pre">CacheManager</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">cacheable</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.interactive.caching.cacheable.html#apache_beam.runners.interactive.caching.cacheable.Cacheable" title="apache_beam.runners.interactive.caching.cacheable.Cacheable"><span class="pre">Cacheable</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/read_cache.html#ReadCache"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.read_cache.ReadCache" title="Link 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 v3.13)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Class that facilitates reading cache of computed PCollections.</p> |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="apache_beam.runners.interactive.caching.read_cache.ReadCache.read_cache"> |
| <span class="sig-name descname"><span class="pre">read_cache</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/typing.html#typing.Tuple" title="(in Python v3.13)"><span class="pre">Tuple</span></a><span class="p"><span class="pre">[</span></span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.13)"><span class="pre">str</span></a><span class="p"><span class="pre">]</span></span></span></span><a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/read_cache.html#ReadCache.read_cache"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.read_cache.ReadCache.read_cache" title="Link to this definition"></a></dt> |
| <dd><p>Reads cache of the cacheable PCollection and wires the cache into the |
| pipeline proto. Returns the pipeline-scoped ids of the cacheable PCollection |
| and the cache reading output PCollection that replaces it.</p> |
| <p>First, it creates a temporary pipeline instance on top of the existing |
| component_id_map from the self._pipeline’s context so that both pipelines |
| share the context and have no conflict component ids. |
| Second, it instantiates a _ReadCacheTransform to build the temporary |
| pipeline with a subgraph under top level transforms that reads the cache of |
| a cacheable PCollection. |
| Third, it copies components of the subgraph from the temporary pipeline to |
| self._pipeline, skipping components that are not in the temporary pipeline |
| but presents in the component_id_map of self._pipeline. Since to_runner_api |
| generates components for all entries in the component_id_map, those |
| component ids from the context shared by self._pipeline need to be ignored. |
| Last, it replaces inputs of all transforms that consume the cacheable |
| PCollection with the output PCollection of the _ReadCacheTransform so that |
| the whole pipeline computes with data from the cache. The pipeline |
| fragment of reading the cacheable PCollection is now disconnected from the |
| rest of the pipeline and can be pruned later.</p> |
| </dd></dl> |
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