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<h1>Source code for airflow.hooks.hdfs_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">airflow</span> <span class="k">import</span> <span class="n">configuration</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="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">snakebite.client</span> <span class="k">import</span> <span class="n">Client</span><span class="p">,</span> <span class="n">HAClient</span><span class="p">,</span> <span class="n">Namenode</span><span class="p">,</span> <span class="n">AutoConfigClient</span>
<div class="viewcode-block" id="snakebite_loaded"><a class="viewcode-back" href="../../../_api/airflow/hooks/hdfs_hook/index.html#airflow.hooks.hdfs_hook.snakebite_loaded">[docs]</a> <span class="n">snakebite_loaded</span> <span class="o">=</span> <span class="kc">True</span></div>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">snakebite_loaded</span> <span class="o">=</span> <span class="kc">False</span>
<div class="viewcode-block" id="HDFSHookException"><a class="viewcode-back" href="../../../_api/airflow/hooks/hdfs_hook/index.html#airflow.hooks.hdfs_hook.HDFSHookException">[docs]</a><span class="k">class</span> <span class="nc">HDFSHookException</span><span class="p">(</span><span class="n">AirflowException</span><span class="p">):</span>
<span class="k">pass</span></div>
<div class="viewcode-block" id="HDFSHook"><a class="viewcode-back" href="../../../_api/airflow/hooks/hdfs_hook/index.html#airflow.hooks.hdfs_hook.HDFSHook">[docs]</a><span class="k">class</span> <span class="nc">HDFSHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Interact with HDFS. This class is a wrapper around the snakebite library.</span>
<span class="sd"> :param hdfs_conn_id: Connection id to fetch connection info</span>
<span class="sd"> :type hdfs_conn_id: str</span>
<span class="sd"> :param proxy_user: effective user for HDFS operations</span>
<span class="sd"> :type proxy_user: str</span>
<span class="sd"> :param autoconfig: use snakebite&#39;s automatically configured client</span>
<span class="sd"> :type autoconfig: bool</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">hdfs_conn_id</span><span class="o">=</span><span class="s1">&#39;hdfs_default&#39;</span><span class="p">,</span> <span class="n">proxy_user</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">autoconfig</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">snakebite_loaded</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span>
<span class="s1">&#39;This HDFSHook implementation requires snakebite, but &#39;</span>
<span class="s1">&#39;snakebite is not compatible with Python 3 &#39;</span>
<span class="s1">&#39;(as of August 2015). Please use Python 2 if you require &#39;</span>
<span class="s1">&#39;this hook -- or help by submitting a PR!&#39;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hdfs_conn_id</span> <span class="o">=</span> <span class="n">hdfs_conn_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">proxy_user</span> <span class="o">=</span> <span class="n">proxy_user</span>
<span class="bp">self</span><span class="o">.</span><span class="n">autoconfig</span> <span class="o">=</span> <span class="n">autoconfig</span>
<div class="viewcode-block" id="HDFSHook.get_conn"><a class="viewcode-back" href="../../../_api/airflow/hooks/hdfs_hook/index.html#airflow.hooks.hdfs_hook.HDFSHook.get_conn">[docs]</a> <span class="k">def</span> <span class="nf">get_conn</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Returns a snakebite HDFSClient object.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># When using HAClient, proxy_user must be the same, so is ok to always</span>
<span class="c1"># take the first.</span>
<span class="n">effective_user</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">proxy_user</span>
<span class="n">autoconfig</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">autoconfig</span>
<span class="n">use_sasl</span> <span class="o">=</span> <span class="n">configuration</span><span class="o">.</span><span class="n">conf</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;core&#39;</span><span class="p">,</span> <span class="s1">&#39;security&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s1">&#39;kerberos&#39;</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">connections</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_connections</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">hdfs_conn_id</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">effective_user</span><span class="p">:</span>
<span class="n">effective_user</span> <span class="o">=</span> <span class="n">connections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">login</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">autoconfig</span><span class="p">:</span>
<span class="n">autoconfig</span> <span class="o">=</span> <span class="n">connections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</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;autoconfig&#39;</span><span class="p">,</span>
<span class="kc">False</span><span class="p">)</span>
<span class="n">hdfs_namenode_principal</span> <span class="o">=</span> <span class="n">connections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</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;hdfs_namenode_principal&#39;</span><span class="p">)</span>
<span class="k">except</span> <span class="n">AirflowException</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">autoconfig</span><span class="p">:</span>
<span class="k">raise</span>
<span class="k">if</span> <span class="n">autoconfig</span><span class="p">:</span>
<span class="c1"># will read config info from $HADOOP_HOME conf files</span>
<span class="n">client</span> <span class="o">=</span> <span class="n">AutoConfigClient</span><span class="p">(</span><span class="n">effective_user</span><span class="o">=</span><span class="n">effective_user</span><span class="p">,</span>
<span class="n">use_sasl</span><span class="o">=</span><span class="n">use_sasl</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="n">connections</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">client</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">connections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">host</span><span class="p">,</span> <span class="n">connections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">port</span><span class="p">,</span>
<span class="n">effective_user</span><span class="o">=</span><span class="n">effective_user</span><span class="p">,</span> <span class="n">use_sasl</span><span class="o">=</span><span class="n">use_sasl</span><span class="p">,</span>
<span class="n">hdfs_namenode_principal</span><span class="o">=</span><span class="n">hdfs_namenode_principal</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="n">connections</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">nn</span> <span class="o">=</span> <span class="p">[</span><span class="n">Namenode</span><span class="p">(</span><span class="n">conn</span><span class="o">.</span><span class="n">host</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">port</span><span class="p">)</span> <span class="k">for</span> <span class="n">conn</span> <span class="ow">in</span> <span class="n">connections</span><span class="p">]</span>
<span class="n">client</span> <span class="o">=</span> <span class="n">HAClient</span><span class="p">(</span><span class="n">nn</span><span class="p">,</span> <span class="n">effective_user</span><span class="o">=</span><span class="n">effective_user</span><span class="p">,</span>
<span class="n">use_sasl</span><span class="o">=</span><span class="n">use_sasl</span><span class="p">,</span>
<span class="n">hdfs_namenode_principal</span><span class="o">=</span><span class="n">hdfs_namenode_principal</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">HDFSHookException</span><span class="p">(</span><span class="s2">&quot;conn_id doesn&#39;t exist in the repository &quot;</span>
<span class="s2">&quot;and autoconfig is not specified&quot;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">client</span></div></div>
</pre></div>
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