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<div class="subTitle">org.apache.hadoop.yarn.client.api</div>
<h2 title="Class NMTokenCache" class="title">Class NMTokenCache</h2>
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<li>org.apache.hadoop.yarn.client.api.NMTokenCache</li>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public class <span class="typeNameLabel">NMTokenCache</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">NMTokenCache manages NMTokens required for an Application Master
communicating with individual NodeManagers.
<p>
By default YARN client libraries <a href="../../../../../../org/apache/hadoop/yarn/client/api/AMRMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>AMRMClient</code></a> and <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>NMClient</code></a> use
<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getSingleton--"><code>getSingleton()</code></a> instance of the cache.
<ul>
<li>
Using the singleton instance of the cache is appropriate when running a
single ApplicationMaster in the same JVM.
</li>
<li>
When using the singleton, users don't need to do anything special,
<a href="../../../../../../org/apache/hadoop/yarn/client/api/AMRMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>AMRMClient</code></a> and <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>NMClient</code></a> are already set up to use the
default singleton <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html" title="class in org.apache.hadoop.yarn.client.api"><code>NMTokenCache</code></a>
</li>
</ul>
If running multiple Application Masters in the same JVM, a different cache
instance should be used for each Application Master.
<ul>
<li>
If using the <a href="../../../../../../org/apache/hadoop/yarn/client/api/AMRMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>AMRMClient</code></a> and the <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMClient.html" title="class in org.apache.hadoop.yarn.client.api"><code>NMClient</code></a>, setting up
and using an instance cache is as follows:
<pre>
NMTokenCache nmTokenCache = new NMTokenCache();
AMRMClient rmClient = AMRMClient.createAMRMClient();
NMClient nmClient = NMClient.createNMClient();
nmClient.setNMTokenCache(nmTokenCache);
...
</pre>
</li>
<li>
If using the <a href="../../../../../../org/apache/hadoop/yarn/client/api/async/AMRMClientAsync.html" title="class in org.apache.hadoop.yarn.client.api.async"><code>AMRMClientAsync</code></a> and the <a href="../../../../../../org/apache/hadoop/yarn/client/api/async/NMClientAsync.html" title="class in org.apache.hadoop.yarn.client.api.async"><code>NMClientAsync</code></a>,
setting up and using an instance cache is as follows:
<pre>
NMTokenCache nmTokenCache = new NMTokenCache();
AMRMClient rmClient = AMRMClient.createAMRMClient();
NMClient nmClient = NMClient.createNMClient();
nmClient.setNMTokenCache(nmTokenCache);
AMRMClientAsync rmClientAsync = new AMRMClientAsync(rmClient, 1000, [AMRM_CALLBACK]);
NMClientAsync nmClientAsync = new NMClientAsync("nmClient", nmClient, [NM_CALLBACK]);
...
</pre>
</li>
<li>
If using <code>ApplicationMasterProtocol</code> and
<code>ContainerManagementProtocol</code> directly, setting up and using an
instance cache is as follows:
<pre>
NMTokenCache nmTokenCache = new NMTokenCache();
...
ApplicationMasterProtocol amPro = ClientRMProxy.createRMProxy(conf, ApplicationMasterProtocol.class);
...
AllocateRequest allocateRequest = ...
...
AllocateResponse allocateResponse = rmClient.allocate(allocateRequest);
for (NMToken token : allocateResponse.getNMTokens()) {
nmTokenCache.setToken(token.getNodeId().toString(), token.getToken());
}
...
ContainerManagementProtocolProxy nmPro = ContainerManagementProtocolProxy(conf, nmTokenCache);
...
nmPro.startContainer(container, containerContext);
...
</pre>
</li>
</ul>
It is also possible to mix the usage of a client (<code>AMRMClient</code> or
<code>NMClient</code>, or the async versions of them) with a protocol proxy
(<code>ContainerManagementProtocolProxy</code> or
<code>ApplicationMasterProtocol</code>).</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#NMTokenCache--">NMTokenCache</a></span>()</code>
<div class="block">Creates a NM token cache instance.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#clearCache--">clearCache</a></span>()</code>
<div class="block">It will remove all the nm tokens from its cache</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#containsToken-java.lang.String-">containsToken</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;nodeAddr)</code>
<div class="block">Returns true if NMToken is present in cache.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static org.apache.hadoop.yarn.api.records.Token</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getNMToken-java.lang.String-">getNMToken</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;nodeAddr)</code>
<div class="block">Returns NMToken, null if absent.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html" title="class in org.apache.hadoop.yarn.client.api">NMTokenCache</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getSingleton--">getSingleton</a></span>()</code>
<div class="block">Returns the singleton NM token cache.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.yarn.api.records.Token</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getToken-java.lang.String-">getToken</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;nodeAddr)</code>
<div class="block">Returns NMToken, null if absent</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#numberOfTokensInCache--">numberOfTokensInCache</a></span>()</code>
<div class="block">Returns the number of NMTokens present in cache.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#removeToken-java.lang.String-">removeToken</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;nodeAddr)</code>
<div class="block">Removes NMToken for specified node manager</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#setNMToken-java.lang.String-org.apache.hadoop.yarn.api.records.Token-">setNMToken</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;nodeAddr,
org.apache.hadoop.yarn.api.records.Token&nbsp;token)</code>
<div class="block">Sets the NMToken for node address only in the singleton obtained from
<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getSingleton--"><code>getSingleton()</code></a>.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#setToken-java.lang.String-org.apache.hadoop.yarn.api.records.Token-">setToken</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;nodeAddr,
org.apache.hadoop.yarn.api.records.Token&nbsp;token)</code>
<div class="block">Sets the NMToken for node address</div>
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<h3>Constructor Detail</h3>
<a name="NMTokenCache--">
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<h4>NMTokenCache</h4>
<pre>public&nbsp;NMTokenCache()</pre>
<div class="block">Creates a NM token cache instance.</div>
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<a name="getSingleton--">
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<h4>getSingleton</h4>
<pre>public static&nbsp;<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html" title="class in org.apache.hadoop.yarn.client.api">NMTokenCache</a>&nbsp;getSingleton()</pre>
<div class="block">Returns the singleton NM token cache.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the singleton NM token cache.</dd>
</dl>
</li>
</ul>
<a name="getNMToken-java.lang.String-">
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<h4>getNMToken</h4>
<pre>@InterfaceAudience.Public
public static&nbsp;org.apache.hadoop.yarn.api.records.Token&nbsp;getNMToken(<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;nodeAddr)</pre>
<div class="block">Returns NMToken, null if absent. Only the singleton obtained from
<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getSingleton--"><code>getSingleton()</code></a> is looked at for the tokens. If you are using your
own NMTokenCache that is different from the singleton, use
<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getToken-java.lang.String-"><code>getToken(String)</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeAddr</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>Token</code> NMToken required for communicating with node manager</dd>
</dl>
</li>
</ul>
<a name="setNMToken-java.lang.String-org.apache.hadoop.yarn.api.records.Token-">
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<h4>setNMToken</h4>
<pre>@InterfaceAudience.Public
public static&nbsp;void&nbsp;setNMToken(<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;nodeAddr,
org.apache.hadoop.yarn.api.records.Token&nbsp;token)</pre>
<div class="block">Sets the NMToken for node address only in the singleton obtained from
<a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#getSingleton--"><code>getSingleton()</code></a>. If you are using your own NMTokenCache that is
different from the singleton, use <a href="../../../../../../org/apache/hadoop/yarn/client/api/NMTokenCache.html#setToken-java.lang.String-org.apache.hadoop.yarn.api.records.Token-"><code>setToken(String, Token)</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeAddr</code> - node address (host:port)</dd>
<dd><code>token</code> - NMToken</dd>
</dl>
</li>
</ul>
<a name="getToken-java.lang.String-">
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<h4>getToken</h4>
<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public&nbsp;org.apache.hadoop.yarn.api.records.Token&nbsp;getToken(<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;nodeAddr)</pre>
<div class="block">Returns NMToken, null if absent</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeAddr</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>Token</code> NMToken required for communicating with node
manager</dd>
</dl>
</li>
</ul>
<a name="setToken-java.lang.String-org.apache.hadoop.yarn.api.records.Token-">
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<h4>setToken</h4>
<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public&nbsp;void&nbsp;setToken(<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;nodeAddr,
org.apache.hadoop.yarn.api.records.Token&nbsp;token)</pre>
<div class="block">Sets the NMToken for node address</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeAddr</code> - node address (host:port)</dd>
<dd><code>token</code> - NMToken</dd>
</dl>
</li>
</ul>
<a name="containsToken-java.lang.String-">
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<h4>containsToken</h4>
<pre>@InterfaceAudience.Private
public&nbsp;boolean&nbsp;containsToken(<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;nodeAddr)</pre>
<div class="block">Returns true if NMToken is present in cache.</div>
</li>
</ul>
<a name="numberOfTokensInCache--">
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<h4>numberOfTokensInCache</h4>
<pre>@InterfaceAudience.Private
public&nbsp;int&nbsp;numberOfTokensInCache()</pre>
<div class="block">Returns the number of NMTokens present in cache.</div>
</li>
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<a name="removeToken-java.lang.String-">
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<h4>removeToken</h4>
<pre>@InterfaceAudience.Private
public&nbsp;void&nbsp;removeToken(<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;nodeAddr)</pre>
<div class="block">Removes NMToken for specified node manager</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeAddr</code> - node address (host:port)</dd>
</dl>
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<h4>clearCache</h4>
<pre>@InterfaceAudience.Private
public&nbsp;void&nbsp;clearCache()</pre>
<div class="block">It will remove all the nm tokens from its cache</div>
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