Apache Zeppelin and Spark deploy mode options
<p>I understand it directly relates to the <code>MASTER</code> environment variable in <code>conf/zeppelin-env.sh</code> and whether the value is <code>spark://&lt;master_ip&gt;:7077</code> or <code>yarn-client</code>, but when is Apache Zeppelin running Spark in <code>client</code> mode and when in <code>cluster</code> mode?</p>