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<h1>Source code for apache_beam.runners.sdf_common</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span>
<span class="c1"># contributor license agreements. See the NOTICE file distributed with</span>
<span class="c1"># this work for additional information regarding copyright ownership.</span>
<span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span>
<span class="c1"># (the &quot;License&quot;); you may not use this file except in compliance with</span>
<span class="c1"># the License. You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="c1">#</span>
<span class="sd">&quot;&quot;&quot;This module contains Splittable DoFn logic that&#39;s common to all runners.&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
<span class="kn">import</span> <span class="nn">uuid</span>
<span class="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">object</span>
<span class="kn">import</span> <span class="nn">apache_beam</span> <span class="k">as</span> <span class="nn">beam</span>
<span class="kn">from</span> <span class="nn">apache_beam</span> <span class="k">import</span> <span class="n">pvalue</span>
<span class="kn">from</span> <span class="nn">apache_beam.coders</span> <span class="k">import</span> <span class="n">typecoders</span>
<span class="kn">from</span> <span class="nn">apache_beam.pipeline</span> <span class="k">import</span> <span class="n">AppliedPTransform</span>
<span class="kn">from</span> <span class="nn">apache_beam.pipeline</span> <span class="k">import</span> <span class="n">PTransformOverride</span>
<span class="kn">from</span> <span class="nn">apache_beam.runners.common</span> <span class="k">import</span> <span class="n">DoFnInvoker</span>
<span class="kn">from</span> <span class="nn">apache_beam.runners.common</span> <span class="k">import</span> <span class="n">DoFnSignature</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms.core</span> <span class="k">import</span> <span class="n">ParDo</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms.ptransform</span> <span class="k">import</span> <span class="n">PTransform</span>
<div class="viewcode-block" id="SplittableParDoOverride"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplittableParDoOverride">[docs]</a><span class="k">class</span> <span class="nc">SplittableParDoOverride</span><span class="p">(</span><span class="n">PTransformOverride</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform override for ParDo transformss of SplittableDoFns.</span>
<span class="sd"> Replaces the ParDo transform with a SplittableParDo transform that performs</span>
<span class="sd"> SDF specific logic.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="SplittableParDoOverride.matches"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplittableParDoOverride.matches">[docs]</a> <span class="k">def</span> <span class="nf">matches</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">applied_ptransform</span><span class="p">):</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">applied_ptransform</span><span class="p">,</span> <span class="n">AppliedPTransform</span><span class="p">)</span>
<span class="n">transform</span> <span class="o">=</span> <span class="n">applied_ptransform</span><span class="o">.</span><span class="n">transform</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">transform</span><span class="p">,</span> <span class="n">ParDo</span><span class="p">):</span>
<span class="n">signature</span> <span class="o">=</span> <span class="n">DoFnSignature</span><span class="p">(</span><span class="n">transform</span><span class="o">.</span><span class="n">fn</span><span class="p">)</span>
<span class="k">return</span> <span class="n">signature</span><span class="o">.</span><span class="n">is_splittable_dofn</span><span class="p">()</span></div>
<div class="viewcode-block" id="SplittableParDoOverride.get_replacement_transform"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplittableParDoOverride.get_replacement_transform">[docs]</a> <span class="k">def</span> <span class="nf">get_replacement_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ptransform</span><span class="p">):</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">ptransform</span><span class="p">,</span> <span class="n">ParDo</span><span class="p">)</span>
<span class="n">do_fn</span> <span class="o">=</span> <span class="n">ptransform</span><span class="o">.</span><span class="n">fn</span>
<span class="n">signature</span> <span class="o">=</span> <span class="n">DoFnSignature</span><span class="p">(</span><span class="n">do_fn</span><span class="p">)</span>
<span class="k">if</span> <span class="n">signature</span><span class="o">.</span><span class="n">is_splittable_dofn</span><span class="p">():</span>
<span class="k">return</span> <span class="n">SplittableParDo</span><span class="p">(</span><span class="n">ptransform</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ptransform</span></div></div>
<div class="viewcode-block" id="SplittableParDo"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplittableParDo">[docs]</a><span class="k">class</span> <span class="nc">SplittableParDo</span><span class="p">(</span><span class="n">PTransform</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform that processes a PCollection using a Splittable DoFn.&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ptransform</span><span class="p">):</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">ptransform</span><span class="p">,</span> <span class="n">ParDo</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_ptransform</span> <span class="o">=</span> <span class="n">ptransform</span>
<div class="viewcode-block" id="SplittableParDo.expand"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplittableParDo.expand">[docs]</a> <span class="k">def</span> <span class="nf">expand</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pcoll</span><span class="p">):</span>
<span class="n">sdf</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ptransform</span><span class="o">.</span><span class="n">fn</span>
<span class="n">signature</span> <span class="o">=</span> <span class="n">DoFnSignature</span><span class="p">(</span><span class="n">sdf</span><span class="p">)</span>
<span class="n">invoker</span> <span class="o">=</span> <span class="n">DoFnInvoker</span><span class="o">.</span><span class="n">create_invoker</span><span class="p">(</span><span class="n">signature</span><span class="p">,</span> <span class="n">process_invocation</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">element_coder</span> <span class="o">=</span> <span class="n">typecoders</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">get_coder</span><span class="p">(</span><span class="n">pcoll</span><span class="o">.</span><span class="n">element_type</span><span class="p">)</span>
<span class="n">restriction_coder</span> <span class="o">=</span> <span class="n">invoker</span><span class="o">.</span><span class="n">invoke_restriction_coder</span><span class="p">()</span>
<span class="n">keyed_elements</span> <span class="o">=</span> <span class="p">(</span><span class="n">pcoll</span>
<span class="o">|</span> <span class="s1">&#39;pair&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ParDo</span><span class="p">(</span><span class="n">PairWithRestrictionFn</span><span class="p">(</span><span class="n">sdf</span><span class="p">))</span>
<span class="o">|</span> <span class="s1">&#39;split&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ParDo</span><span class="p">(</span><span class="n">SplitRestrictionFn</span><span class="p">(</span><span class="n">sdf</span><span class="p">))</span>
<span class="o">|</span> <span class="s1">&#39;explode&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ParDo</span><span class="p">(</span><span class="n">ExplodeWindowsFn</span><span class="p">())</span>
<span class="o">|</span> <span class="s1">&#39;random&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ParDo</span><span class="p">(</span><span class="n">RandomUniqueKeyFn</span><span class="p">()))</span>
<span class="k">return</span> <span class="n">keyed_elements</span> <span class="o">|</span> <span class="n">ProcessKeyedElements</span><span class="p">(</span>
<span class="n">sdf</span><span class="p">,</span> <span class="n">element_coder</span><span class="p">,</span> <span class="n">restriction_coder</span><span class="p">,</span>
<span class="n">pcoll</span><span class="o">.</span><span class="n">windowing</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ptransform</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ptransform</span><span class="o">.</span><span class="n">kwargs</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_ptransform</span><span class="o">.</span><span class="n">side_inputs</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="ElementAndRestriction"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.ElementAndRestriction">[docs]</a><span class="k">class</span> <span class="nc">ElementAndRestriction</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A holder for an element and a restriction.&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="n">restriction</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">element</span> <span class="o">=</span> <span class="n">element</span>
<span class="bp">self</span><span class="o">.</span><span class="n">restriction</span> <span class="o">=</span> <span class="n">restriction</span></div>
<div class="viewcode-block" id="PairWithRestrictionFn"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.PairWithRestrictionFn">[docs]</a><span class="k">class</span> <span class="nc">PairWithRestrictionFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform that pairs each element with a restriction.&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">do_fn</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_do_fn</span> <span class="o">=</span> <span class="n">do_fn</span>
<div class="viewcode-block" id="PairWithRestrictionFn.start_bundle"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.PairWithRestrictionFn.start_bundle">[docs]</a> <span class="k">def</span> <span class="nf">start_bundle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">signature</span> <span class="o">=</span> <span class="n">DoFnSignature</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_do_fn</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_invoker</span> <span class="o">=</span> <span class="n">DoFnInvoker</span><span class="o">.</span><span class="n">create_invoker</span><span class="p">(</span>
<span class="n">signature</span><span class="p">,</span> <span class="n">process_invocation</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<div class="viewcode-block" id="PairWithRestrictionFn.process"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.PairWithRestrictionFn.process">[docs]</a> <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="n">window</span><span class="o">=</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="o">.</span><span class="n">WindowParam</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">initial_restriction</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_invoker</span><span class="o">.</span><span class="n">invoke_initial_restriction</span><span class="p">(</span><span class="n">element</span><span class="p">)</span>
<span class="k">yield</span> <span class="n">ElementAndRestriction</span><span class="p">(</span><span class="n">element</span><span class="p">,</span> <span class="n">initial_restriction</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="SplitRestrictionFn"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplitRestrictionFn">[docs]</a><span class="k">class</span> <span class="nc">SplitRestrictionFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform that perform initial splitting of Splittable DoFn inputs.&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">do_fn</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_do_fn</span> <span class="o">=</span> <span class="n">do_fn</span>
<div class="viewcode-block" id="SplitRestrictionFn.start_bundle"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplitRestrictionFn.start_bundle">[docs]</a> <span class="k">def</span> <span class="nf">start_bundle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">signature</span> <span class="o">=</span> <span class="n">DoFnSignature</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_do_fn</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_invoker</span> <span class="o">=</span> <span class="n">DoFnInvoker</span><span class="o">.</span><span class="n">create_invoker</span><span class="p">(</span>
<span class="n">signature</span><span class="p">,</span> <span class="n">process_invocation</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<div class="viewcode-block" id="SplitRestrictionFn.process"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.SplitRestrictionFn.process">[docs]</a> <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element_and_restriction</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">element</span> <span class="o">=</span> <span class="n">element_and_restriction</span><span class="o">.</span><span class="n">element</span>
<span class="n">restriction</span> <span class="o">=</span> <span class="n">element_and_restriction</span><span class="o">.</span><span class="n">restriction</span>
<span class="n">restriction_parts</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_invoker</span><span class="o">.</span><span class="n">invoke_split</span><span class="p">(</span>
<span class="n">element</span><span class="p">,</span>
<span class="n">restriction</span><span class="p">)</span>
<span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">restriction_parts</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">ElementAndRestriction</span><span class="p">(</span><span class="n">element</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="ExplodeWindowsFn"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.ExplodeWindowsFn">[docs]</a><span class="k">class</span> <span class="nc">ExplodeWindowsFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform that forces the runner to explode windows.</span>
<span class="sd"> This is done to make sure that Splittable DoFn proceses an element for each of</span>
<span class="sd"> the windows that element belongs to.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="ExplodeWindowsFn.process"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.ExplodeWindowsFn.process">[docs]</a> <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="n">window</span><span class="o">=</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="o">.</span><span class="n">WindowParam</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">element</span></div></div>
<div class="viewcode-block" id="RandomUniqueKeyFn"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.RandomUniqueKeyFn">[docs]</a><span class="k">class</span> <span class="nc">RandomUniqueKeyFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A transform that assigns a unique key to each element.&quot;&quot;&quot;</span>
<div class="viewcode-block" id="RandomUniqueKeyFn.process"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.RandomUniqueKeyFn.process">[docs]</a> <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="n">window</span><span class="o">=</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="o">.</span><span class="n">WindowParam</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># We ignore UUID collisions here since they are extremely rare.</span>
<span class="k">yield</span> <span class="p">(</span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid4</span><span class="p">()</span><span class="o">.</span><span class="n">bytes</span><span class="p">,</span> <span class="n">element</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="ProcessKeyedElements"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.ProcessKeyedElements">[docs]</a><span class="k">class</span> <span class="nc">ProcessKeyedElements</span><span class="p">(</span><span class="n">PTransform</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A primitive transform that performs SplittableDoFn magic.</span>
<span class="sd"> Input to this transform should be a PCollection of keyed ElementAndRestriction</span>
<span class="sd"> objects.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span> <span class="n">sdf</span><span class="p">,</span> <span class="n">element_coder</span><span class="p">,</span> <span class="n">restriction_coder</span><span class="p">,</span> <span class="n">windowing_strategy</span><span class="p">,</span>
<span class="n">ptransform_args</span><span class="p">,</span> <span class="n">ptransform_kwargs</span><span class="p">,</span> <span class="n">ptransform_side_inputs</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sdf</span> <span class="o">=</span> <span class="n">sdf</span>
<span class="bp">self</span><span class="o">.</span><span class="n">element_coder</span> <span class="o">=</span> <span class="n">element_coder</span>
<span class="bp">self</span><span class="o">.</span><span class="n">restriction_coder</span> <span class="o">=</span> <span class="n">restriction_coder</span>
<span class="bp">self</span><span class="o">.</span><span class="n">windowing_strategy</span> <span class="o">=</span> <span class="n">windowing_strategy</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ptransform_args</span> <span class="o">=</span> <span class="n">ptransform_args</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ptransform_kwargs</span> <span class="o">=</span> <span class="n">ptransform_kwargs</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ptransform_side_inputs</span> <span class="o">=</span> <span class="n">ptransform_side_inputs</span>
<div class="viewcode-block" id="ProcessKeyedElements.expand"><a class="viewcode-back" href="../../../apache_beam.runners.sdf_common.html#apache_beam.runners.sdf_common.ProcessKeyedElements.expand">[docs]</a> <span class="k">def</span> <span class="nf">expand</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pcoll</span><span class="p">):</span>
<span class="k">return</span> <span class="n">pvalue</span><span class="o">.</span><span class="n">PCollection</span><span class="p">(</span><span class="n">pcoll</span><span class="o">.</span><span class="n">pipeline</span><span class="p">)</span></div></div>
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