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<h1>Source code for airflow.hooks.pig_hook</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="c1"># or more contributor license agreements. See the NOTICE file</span>
<span class="c1"># distributed with this work for additional information</span>
<span class="c1"># regarding copyright ownership. The ASF licenses this file</span>
<span class="c1"># to you under the Apache License, Version 2.0 (the</span>
<span class="c1"># &quot;License&quot;); you may not use this file except in compliance</span>
<span class="c1"># with 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,</span>
<span class="c1"># software distributed under the License is distributed on an</span>
<span class="c1"># &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span>
<span class="c1"># KIND, either express or implied. See the License for the</span>
<span class="c1"># specific language governing permissions and limitations</span>
<span class="c1"># under the License.</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">print_function</span>
<span class="kn">import</span> <span class="nn">subprocess</span>
<span class="kn">from</span> <span class="nn">tempfile</span> <span class="k">import</span> <span class="n">NamedTemporaryFile</span>
<span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="k">import</span> <span class="n">AirflowException</span>
<span class="kn">from</span> <span class="nn">airflow.hooks.base_hook</span> <span class="k">import</span> <span class="n">BaseHook</span>
<span class="kn">from</span> <span class="nn">airflow.utils.file</span> <span class="k">import</span> <span class="n">TemporaryDirectory</span>
<div class="viewcode-block" id="PigCliHook"><a class="viewcode-back" href="../../../_api/airflow/hooks/pig_hook/index.html#airflow.hooks.pig_hook.PigCliHook">[docs]</a><span class="k">class</span> <span class="nc">PigCliHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Simple wrapper around the pig CLI.</span>
<span class="sd"> Note that you can also set default pig CLI properties using the</span>
<span class="sd"> ``pig_properties`` to be used in your connection as in</span>
<span class="sd"> ``{&quot;pig_properties&quot;: &quot;-Dpig.tmpfilecompression=true&quot;}``</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">pig_cli_conn_id</span><span class="o">=</span><span class="s2">&quot;pig_cli_default&quot;</span><span class="p">):</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_connection</span><span class="p">(</span><span class="n">pig_cli_conn_id</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pig_properties</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;pig_properties&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conn</span> <span class="o">=</span> <span class="n">conn</span>
<div class="viewcode-block" id="PigCliHook.run_cli"><a class="viewcode-back" href="../../../_api/airflow/hooks/pig_hook/index.html#airflow.hooks.pig_hook.PigCliHook.run_cli">[docs]</a> <span class="k">def</span> <span class="nf">run_cli</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pig</span><span class="p">,</span> <span class="n">pig_opts</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">verbose</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Run an pig script using the pig cli</span>
<span class="sd"> &gt;&gt;&gt; ph = PigCliHook()</span>
<span class="sd"> &gt;&gt;&gt; result = ph.run_cli(&quot;ls /;&quot;, pig_opts=&quot;-x mapreduce&quot;)</span>
<span class="sd"> &gt;&gt;&gt; (&quot;hdfs://&quot; in result)</span>
<span class="sd"> True</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">with</span> <span class="n">TemporaryDirectory</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="s1">&#39;airflow_pigop_&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">tmp_dir</span><span class="p">:</span>
<span class="k">with</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="nb">dir</span><span class="o">=</span><span class="n">tmp_dir</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">pig</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">))</span>
<span class="n">f</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="n">fname</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">name</span>
<span class="n">pig_bin</span> <span class="o">=</span> <span class="s1">&#39;pig&#39;</span>
<span class="n">cmd_extra</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">pig_cmd</span> <span class="o">=</span> <span class="p">[</span><span class="n">pig_bin</span><span class="p">]</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">pig_properties</span><span class="p">:</span>
<span class="n">pig_properties_list</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">pig_properties</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
<span class="n">pig_cmd</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">pig_properties_list</span><span class="p">)</span>
<span class="k">if</span> <span class="n">pig_opts</span><span class="p">:</span>
<span class="n">pig_opts_list</span> <span class="o">=</span> <span class="n">pig_opts</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
<span class="n">pig_cmd</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">pig_opts_list</span><span class="p">)</span>
<span class="n">pig_cmd</span><span class="o">.</span><span class="n">extend</span><span class="p">([</span><span class="s1">&#39;-f&#39;</span><span class="p">,</span> <span class="n">fname</span><span class="p">]</span> <span class="o">+</span> <span class="n">cmd_extra</span><span class="p">)</span>
<span class="k">if</span> <span class="n">verbose</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;</span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">pig_cmd</span><span class="p">))</span>
<span class="n">sp</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span>
<span class="n">pig_cmd</span><span class="p">,</span>
<span class="n">stdout</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span>
<span class="n">stderr</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">STDOUT</span><span class="p">,</span>
<span class="n">cwd</span><span class="o">=</span><span class="n">tmp_dir</span><span class="p">,</span>
<span class="n">close_fds</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sp</span> <span class="o">=</span> <span class="n">sp</span>
<span class="n">stdout</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="nb">iter</span><span class="p">(</span><span class="n">sp</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">readline</span><span class="p">,</span> <span class="sa">b</span><span class="s1">&#39;&#39;</span><span class="p">):</span>
<span class="n">stdout</span> <span class="o">+=</span> <span class="n">line</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">verbose</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">line</span><span class="o">.</span><span class="n">strip</span><span class="p">())</span>
<span class="n">sp</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>
<span class="k">if</span> <span class="n">sp</span><span class="o">.</span><span class="n">returncode</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="n">stdout</span><span class="p">)</span>
<span class="k">return</span> <span class="n">stdout</span></div>
<div class="viewcode-block" id="PigCliHook.kill"><a class="viewcode-back" href="../../../_api/airflow/hooks/pig_hook/index.html#airflow.hooks.pig_hook.PigCliHook.kill">[docs]</a> <span class="k">def</span> <span class="nf">kill</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">&#39;sp&#39;</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">sp</span><span class="o">.</span><span class="n">poll</span><span class="p">()</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Killing the Pig job&quot;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sp</span><span class="o">.</span><span class="n">kill</span><span class="p">()</span></div></div>
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