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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"># "License"); 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"># "AS IS" 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">six</span> <span class="k">import</span> <span class="n">PY2</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="n">snakebite_imported</span> <span class="o">=</span> <span class="kc">False</span> |
| <span class="k">if</span> <span class="n">PY2</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> |
| <span class="n">snakebite_imported</span> <span class="o">=</span> <span class="kc">True</span> |
| |
| |
| <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 class="viewcode-block" id="HDFSHook"><a class="viewcode-back" href="../../../code.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">"""</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 conn_id: string</span> |
| <span class="sd"> :param proxy_user: effective user for HDFS operations</span> |
| <span class="sd"> :type proxy_user: string</span> |
| <span class="sd"> :param autoconfig: use snakebite's automatically configured client</span> |
| <span class="sd"> :type autoconfig: bool</span> |
| <span class="sd"> """</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">'hdfs_default'</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_imported</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span> |
| <span class="s1">'This HDFSHook implementation requires snakebite, but '</span> |
| <span class="s1">'snakebite is not compatible with Python 3 '</span> |
| <span class="s1">'(as of August 2015). Please use Python 2 if you require '</span> |
| <span class="s1">'this hook -- or help by submitting a PR!'</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="../../../code.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">"""</span> |
| <span class="sd"> Returns a snakebite HDFSClient object.</span> |
| <span class="sd"> """</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">'core'</span><span class="p">,</span> <span class="s1">'security'</span><span class="p">)</span> <span class="o">==</span> <span class="s1">'kerberos'</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">'autoconfig'</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">'hdfs_namenode_principal'</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">></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">"conn_id doesn't exist in the repository "</span> |
| <span class="s2">"and autoconfig is not specified"</span><span class="p">)</span> |
| |
| <span class="k">return</span> <span class="n">client</span></div></div> |
| </pre></div> |
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