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| <div class="section" id="module-airflow.contrib.hooks.cassandra_hook"> |
| <span id="airflow-contrib-hooks-cassandra-hook"></span><h1><a class="reference internal" href="#module-airflow.contrib.hooks.cassandra_hook" title="airflow.contrib.hooks.cassandra_hook"><code class="xref py py-mod docutils literal notranslate"><span class="pre">airflow.contrib.hooks.cassandra_hook</span></code></a><a class="headerlink" href="#module-airflow.contrib.hooks.cassandra_hook" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="module-contents"> |
| <h2>Module Contents<a class="headerlink" href="#module-contents" title="Permalink to this headline">¶</a></h2> |
| <dl class="class"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook"> |
| <em class="property">class </em><code class="descclassname">airflow.contrib.hooks.cassandra_hook.</code><code class="descname">CassandraHook</code><span class="sig-paren">(</span><em>cassandra_conn_id='cassandra_default'</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases:<a class="reference internal" href="../../../hooks/base_hook/index.html#airflow.hooks.base_hook.BaseHook" title="airflow.hooks.base_hook.BaseHook"><code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.hooks.base_hook.BaseHook</span></code></a>, <code class="xref py py-class docutils literal notranslate"><span class="pre">airflow.utils.log.logging_mixin.LoggingMixin</span></code></p> |
| <p>Hook used to interact with Cassandra</p> |
| <p>Contact points can be specified as a comma-separated string in the ‘hosts’ |
| field of the connection.</p> |
| <p>Port can be specified in the port field of the connection.</p> |
| <p>If SSL is enabled in Cassandra, pass in a dict in the extra field as kwargs for |
| <code class="docutils literal notranslate"><span class="pre">ssl.wrap_socket()</span></code>. For example:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">{</span> |
| <span class="s1">'ssl_options'</span> <span class="p">:</span> <span class="p">{</span> |
| <span class="s1">'ca_certs'</span> <span class="p">:</span> <span class="n">PATH_TO_CA_CERTS</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>Default load balancing policy is RoundRobinPolicy. To specify a different |
| LB policy:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span> <span class="n">DCAwareRoundRobinPolicy</span> |
| <span class="p">{</span> |
| <span class="s1">'load_balancing_policy'</span><span class="p">:</span> <span class="s1">'DCAwareRoundRobinPolicy'</span><span class="p">,</span> |
| <span class="s1">'load_balancing_policy_args'</span><span class="p">:</span> <span class="p">{</span> |
| <span class="s1">'local_dc'</span><span class="p">:</span> <span class="n">LOCAL_DC_NAME</span><span class="p">,</span> <span class="o">//</span> <span class="n">optional</span> |
| <span class="s1">'used_hosts_per_remote_dc'</span><span class="p">:</span> <span class="n">SOME_INT_VALUE</span><span class="p">,</span> <span class="o">//</span> <span class="n">optional</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| <span class="o">-</span> <span class="n">WhiteListRoundRobinPolicy</span> |
| <span class="p">{</span> |
| <span class="s1">'load_balancing_policy'</span><span class="p">:</span> <span class="s1">'WhiteListRoundRobinPolicy'</span><span class="p">,</span> |
| <span class="s1">'load_balancing_policy_args'</span><span class="p">:</span> <span class="p">{</span> |
| <span class="s1">'hosts'</span><span class="p">:</span> <span class="p">[</span><span class="s1">'HOST1'</span><span class="p">,</span> <span class="s1">'HOST2'</span><span class="p">,</span> <span class="s1">'HOST3'</span><span class="p">]</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| <span class="o">-</span> <span class="n">TokenAwarePolicy</span> |
| <span class="p">{</span> |
| <span class="s1">'load_balancing_policy'</span><span class="p">:</span> <span class="s1">'TokenAwarePolicy'</span><span class="p">,</span> |
| <span class="s1">'load_balancing_policy_args'</span><span class="p">:</span> <span class="p">{</span> |
| <span class="s1">'child_load_balancing_policy'</span><span class="p">:</span> <span class="n">CHILD_POLICY_NAME</span><span class="p">,</span> <span class="o">//</span> <span class="n">optional</span> |
| <span class="s1">'child_load_balancing_policy_args'</span><span class="p">:</span> <span class="p">{</span> <span class="o">...</span> <span class="p">}</span> <span class="o">//</span> <span class="n">optional</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>For details of the Cluster config, see cassandra.cluster.</p> |
| <dl class="method"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.get_conn"> |
| <code class="descname">get_conn</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.get_conn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.get_conn" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Returns a cassandra Session object</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.get_cluster"> |
| <code class="descname">get_cluster</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.get_cluster"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.get_cluster" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.shutdown_cluster"> |
| <code class="descname">shutdown_cluster</code><span class="sig-paren">(</span><em>self</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.shutdown_cluster"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.shutdown_cluster" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Closes all sessions and connections associated with this Cluster.</p> |
| </dd></dl> |
| |
| <dl class="staticmethod"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.get_lb_policy"> |
| <em class="property">static </em><code class="descname">get_lb_policy</code><span class="sig-paren">(</span><em>policy_name</em>, <em>policy_args</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.get_lb_policy"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.get_lb_policy" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.table_exists"> |
| <code class="descname">table_exists</code><span class="sig-paren">(</span><em>self</em>, <em>table</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.table_exists"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.table_exists" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Checks if a table exists in Cassandra</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><p><strong>table</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.7)"><em>str</em></a>) – Target Cassandra table. |
| Use dot notation to target a specific keyspace.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="airflow.contrib.hooks.cassandra_hook.CassandraHook.record_exists"> |
| <code class="descname">record_exists</code><span class="sig-paren">(</span><em>self</em>, <em>table</em>, <em>keys</em><span class="sig-paren">)</span><a class="reference internal" href="../../../../../_modules/airflow/contrib/hooks/cassandra_hook.html#CassandraHook.record_exists"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#airflow.contrib.hooks.cassandra_hook.CassandraHook.record_exists" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Checks if a record exists in Cassandra</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>table</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.7)"><em>str</em></a>) – Target Cassandra table. |
| Use dot notation to target a specific keyspace.</p></li> |
| <li><p><strong>keys</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.7)"><em>dict</em></a>) – The keys and their values to check the existence.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| </dd></dl> |
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