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<div class="subTitle">org.apache.drill.yarn.appMaster</div>
<h2 title="Class Dispatcher" class="title">Class Dispatcher</h2>
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<pre>public class <span class="typeNameLabel">Dispatcher</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Dispatches YARN, timer and ZooKeeper events to the cluster controller.
Allows the controller to be independent of the plumbing needed to
receive events. Divides work among
various components to separate concerns. Three streams of events
feed into an app master "strategy". The three streams are
<ol>
<li>Resource manager</li>
<li>Node manager</li>
<li>Timer</li>
</ol>
<p>
This class is "lightly" multi-threaded: it responds to events
from the RM, NM and timer threads. Within each of these, events
are sequential. So, synchronization is needed across the three event
types, but not within event types. (That is, we won't see two RM events,
say, occurring at the same time from separate threads.)</div>
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<td class="colFirst"><code>class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.NodeCallback.html" title="class in org.apache.drill.yarn.appMaster">Dispatcher.NodeCallback</a></span></code>
<div class="block">Handle YARN Node Manager events.</div>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.TimerCallback.html" title="class in org.apache.drill.yarn.appMaster">Dispatcher.TimerCallback</a></span></code>
<div class="block">Handle timer events: a constant tick to handle time-based actions such as
timeouts.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#getController--">getController</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#getTrackingUrl--">getTrackingUrl</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#registerAddOn-org.apache.drill.yarn.appMaster.DispatcherAddOn-">registerAddOn</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/DispatcherAddOn.html" title="interface in org.apache.drill.yarn.appMaster">DispatcherAddOn</a>&nbsp;addOn)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#registerPollable-org.apache.drill.yarn.appMaster.Pollable-">registerPollable</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Pollable.html" title="interface in org.apache.drill.yarn.appMaster">Pollable</a>&nbsp;pollable)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#run--">run</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#setAMRegistrar-org.apache.drill.yarn.appMaster.AMRegistrar-">setAMRegistrar</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/AMRegistrar.html" title="interface in org.apache.drill.yarn.appMaster">AMRegistrar</a>&nbsp;registrar)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#setHttpPort-int-">setHttpPort</a></span>(int&nbsp;port)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#setTrackingUrl-java.lang.String-">setTrackingUrl</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;trackingUrl)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#setYarn-org.apache.drill.yarn.appMaster.AMYarnFacade-">setYarn</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/AMYarnFacade.html" title="interface in org.apache.drill.yarn.appMaster">AMYarnFacade</a>&nbsp;yarn)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Dispatcher.html#start--">start</a></span>()</code>
<div class="block">Start the dispatcher by initializing YARN and registering the AM.</div>
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<pre>public&nbsp;Dispatcher(int&nbsp;timerPeriodMs)</pre>
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<h4>setYarn</h4>
<pre>public&nbsp;void&nbsp;setYarn(<a href="../../../../../org/apache/drill/yarn/appMaster/AMYarnFacade.html" title="interface in org.apache.drill.yarn.appMaster">AMYarnFacade</a>&nbsp;yarn)
throws <a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></code></dd>
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<h4>getController</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/drill/yarn/appMaster/ClusterController.html" title="interface in org.apache.drill.yarn.appMaster">ClusterController</a>&nbsp;getController()</pre>
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<pre>public&nbsp;void&nbsp;registerPollable(<a href="../../../../../org/apache/drill/yarn/appMaster/Pollable.html" title="interface in org.apache.drill.yarn.appMaster">Pollable</a>&nbsp;pollable)</pre>
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<pre>public&nbsp;void&nbsp;registerAddOn(<a href="../../../../../org/apache/drill/yarn/appMaster/DispatcherAddOn.html" title="interface in org.apache.drill.yarn.appMaster">DispatcherAddOn</a>&nbsp;addOn)</pre>
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<pre>public&nbsp;void&nbsp;setHttpPort(int&nbsp;port)</pre>
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<pre>public&nbsp;void&nbsp;setTrackingUrl(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;trackingUrl)</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getTrackingUrl()</pre>
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<pre>public&nbsp;void&nbsp;setAMRegistrar(<a href="../../../../../org/apache/drill/yarn/appMaster/AMRegistrar.html" title="interface in org.apache.drill.yarn.appMaster">AMRegistrar</a>&nbsp;registrar)</pre>
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<h4>start</h4>
<pre>public&nbsp;boolean&nbsp;start()
throws <a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></pre>
<div class="block">Start the dispatcher by initializing YARN and registering the AM.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if successful, false if the dispatcher did not start.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></code></dd>
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<h4>run</h4>
<pre>public&nbsp;void&nbsp;run()
throws <a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></pre>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/YarnFacadeException.html" title="class in org.apache.drill.yarn.appMaster">YarnFacadeException</a></code></dd>
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