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| <div class="section" id="module-apache_beam.runners.interactive.background_caching_job"> |
| <span id="apache-beam-runners-interactive-background-caching-job-module"></span><h1>apache_beam.runners.interactive.background_caching_job module<a class="headerlink" href="#module-apache_beam.runners.interactive.background_caching_job" title="Permalink to this headline">¶</a></h1> |
| <p>Module to build and run background caching job.</p> |
| <p>For internal use only; no backwards-compatibility guarantees.</p> |
| <p>A background caching job is a job that caches events for all unbounded sources |
| of a given pipeline. With Interactive Beam, one such job is started when a |
| pipeline run happens (which produces a main job in contrast to the background |
| caching job) and meets the following conditions:</p> |
| <blockquote> |
| <div><ol class="arabic simple"> |
| <li>The pipeline contains unbounded sources.</li> |
| <li>No such background job is running.</li> |
| <li>No such background job has completed successfully and the cached events are |
| still valid (invalidated when unbounded sources change in the pipeline).</li> |
| </ol> |
| </div></blockquote> |
| <p>Once started, the background caching job runs asynchronously until it hits some |
| cache size limit. Meanwhile, the main job and future main jobs from the pipeline |
| will run using the deterministic replay-able cached events until they are |
| invalidated.</p> |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.attempt_to_run_background_caching_job"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">attempt_to_run_background_caching_job</code><span class="sig-paren">(</span><em>runner</em>, <em>user_pipeline</em>, <em>options=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#attempt_to_run_background_caching_job"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.attempt_to_run_background_caching_job" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Attempts to run a background caching job for a user-defined pipeline.</p> |
| <p>The pipeline result is automatically tracked by Interactive Beam in case |
| future cancellation/cleanup is needed.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.is_background_caching_job_needed"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">is_background_caching_job_needed</code><span class="sig-paren">(</span><em>user_pipeline</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#is_background_caching_job_needed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.is_background_caching_job_needed" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Determines if a background caching job needs to be started.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.has_source_to_cache"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">has_source_to_cache</code><span class="sig-paren">(</span><em>user_pipeline</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#has_source_to_cache"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.has_source_to_cache" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Determines if a user-defined pipeline contains any source that need to be |
| cached.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.attempt_to_cancel_background_caching_job"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">attempt_to_cancel_background_caching_job</code><span class="sig-paren">(</span><em>user_pipeline</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#attempt_to_cancel_background_caching_job"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.attempt_to_cancel_background_caching_job" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Attempts to cancel background caching job for a user-defined pipeline.</p> |
| <p>If no background caching job needs to be cancelled, NOOP. Otherwise, cancel |
| such job.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.is_source_to_cache_changed"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">is_source_to_cache_changed</code><span class="sig-paren">(</span><em>user_pipeline</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#is_source_to_cache_changed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.is_source_to_cache_changed" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Determines if there is any change in the sources that need to be cached |
| used by the user-defined pipeline.</p> |
| <p>Due to the expensiveness of computations and for the simplicity of usage, this |
| function is not idempotent because Interactive Beam automatically discards |
| previously tracked signature of transforms and tracks the current signature of |
| transforms for the user-defined pipeline if there is any change.</p> |
| <p>When it’s True, there is addition/deletion/mutation of source transforms that |
| requires a new background caching job.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.runners.interactive.background_caching_job.extract_source_to_cache_signature"> |
| <code class="descclassname">apache_beam.runners.interactive.background_caching_job.</code><code class="descname">extract_source_to_cache_signature</code><span class="sig-paren">(</span><em>user_pipeline</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/background_caching_job.html#extract_source_to_cache_signature"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.runners.interactive.background_caching_job.extract_source_to_cache_signature" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Extracts a set of signature for sources that need to be cached in the |
| user-defined pipeline.</p> |
| <p>A signature is a str representation of urn and payload of a source.</p> |
| </dd></dl> |
| |
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