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<div class="subTitle">org.apache.hadoop.conf</div>
<h2 title="Class ReconfigurableBase" class="title">Class ReconfigurableBase</h2>
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<li>org.apache.hadoop.conf.ReconfigurableBase</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a>, <a href="../../../../org/apache/hadoop/conf/Reconfigurable.html" title="interface in org.apache.hadoop.conf">Reconfigurable</a></dd>
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<pre>public abstract class <span class="typeNameLabel">ReconfigurableBase</span>
extends <a href="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</a>
implements <a href="../../../../org/apache/hadoop/conf/Reconfigurable.html" title="interface in org.apache.hadoop.conf">Reconfigurable</a></pre>
<div class="block">Utility base class for implementing the Reconfigurable interface.
Subclasses should override reconfigurePropertyImpl to change individual
properties and getReconfigurableProperties to get all properties that
can be changed at run time.</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/conf/ReconfigurableBase.html#ReconfigurableBase--">ReconfigurableBase</a></span>()</code>
<div class="block">Construct a ReconfigurableBase.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#ReconfigurableBase-org.apache.hadoop.conf.Configuration-">ReconfigurableBase</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>
<div class="block">Construct a ReconfigurableBase with the <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><code>Configuration</code></a>
conf.</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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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/hadoop/conf/ReconfigurationUtil.PropertyChange.html" title="class in org.apache.hadoop.conf">ReconfigurationUtil.PropertyChange</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#getChangedProperties-org.apache.hadoop.conf.Configuration-org.apache.hadoop.conf.Configuration-">getChangedProperties</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;newConf,
<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;oldConf)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected abstract <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#getNewConf--">getNewConf</a></span>()</code>
<div class="block">Create a new configuration.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>abstract <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#getReconfigurableProperties--">getReconfigurableProperties</a></span>()</code>
<div class="block">Return all the properties that can be changed at run time.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.conf.ReconfigurationTaskStatus</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#getReconfigurationTaskStatus--">getReconfigurationTaskStatus</a></span>()</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/hadoop/conf/ReconfigurableBase.html#isPropertyReconfigurable-java.lang.String-">isPropertyReconfigurable</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;property)</code>
<div class="block">Return whether a given property is changeable at run time.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#reconfigureProperty-java.lang.String-java.lang.String-">reconfigureProperty</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;property,
<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;newVal)</code>
<div class="block">Change a configuration property on this object to the value specified.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>protected abstract <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/hadoop/conf/ReconfigurableBase.html#reconfigurePropertyImpl-java.lang.String-java.lang.String-">reconfigurePropertyImpl</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;property,
<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;newVal)</code>
<div class="block">Change a configuration property.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#setReconfigurationUtil-org.apache.hadoop.conf.ReconfigurationUtil-">setReconfigurationUtil</a></span>(<a href="../../../../org/apache/hadoop/conf/ReconfigurationUtil.html" title="class in org.apache.hadoop.conf">ReconfigurationUtil</a>&nbsp;ru)</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/hadoop/conf/ReconfigurableBase.html#shutdownReconfigurationTask--">shutdownReconfigurationTask</a></span>()</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/conf/ReconfigurableBase.html#startReconfigurationTask--">startReconfigurationTask</a></span>()</code>
<div class="block">Start a reconfiguration task to reload configuration in background.</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.conf.<a href="../../../../org/apache/hadoop/conf/Configured.html" title="class in org.apache.hadoop.conf">Configured</a></h3>
<code><a href="../../../../org/apache/hadoop/conf/Configured.html#getConf--">getConf</a>, <a href="../../../../org/apache/hadoop/conf/Configured.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.conf.<a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></h3>
<code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code></li>
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<h4>ReconfigurableBase</h4>
<pre>public&nbsp;ReconfigurableBase()</pre>
<div class="block">Construct a ReconfigurableBase.</div>
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<pre>public&nbsp;ReconfigurableBase(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
<div class="block">Construct a ReconfigurableBase with the <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><code>Configuration</code></a>
conf.</div>
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<h4>setReconfigurationUtil</h4>
<pre>public&nbsp;void&nbsp;setReconfigurationUtil(<a href="../../../../org/apache/hadoop/conf/ReconfigurationUtil.html" title="class in org.apache.hadoop.conf">ReconfigurationUtil</a>&nbsp;ru)</pre>
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<h4>getNewConf</h4>
<pre>protected abstract&nbsp;<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;getNewConf()</pre>
<div class="block">Create a new configuration.</div>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/hadoop/conf/ReconfigurationUtil.PropertyChange.html" title="class in org.apache.hadoop.conf">ReconfigurationUtil.PropertyChange</a>&gt;&nbsp;getChangedProperties(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;newConf,
<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;oldConf)</pre>
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<pre>public&nbsp;void&nbsp;startReconfigurationTask()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Start a reconfiguration task to reload configuration in background.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public&nbsp;org.apache.hadoop.conf.ReconfigurationTaskStatus&nbsp;getReconfigurationTaskStatus()</pre>
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<pre>public&nbsp;void&nbsp;shutdownReconfigurationTask()</pre>
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<pre>public final&nbsp;void&nbsp;reconfigureProperty(<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;property,
<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;newVal)
throws <a href="../../../../org/apache/hadoop/conf/ReconfigurationException.html" title="class in org.apache.hadoop.conf">ReconfigurationException</a></pre>
<div class="block">Change a configuration property on this object to the value specified.
Change a configuration property on this object to the value specified
and return the previous value that the configuration property was set to
(or null if it was not previously set). If newVal is null, set the property
to its default value;
If the property cannot be changed, throw a
<a href="../../../../org/apache/hadoop/conf/ReconfigurationException.html" title="class in org.apache.hadoop.conf"><code>ReconfigurationException</code></a>.
This method makes the change to this objects <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf"><code>Configuration</code></a>
and calls reconfigurePropertyImpl to update internal data structures.
This method cannot be overridden, subclasses should instead override
reconfigurePropertyImpl.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html#reconfigureProperty-java.lang.String-java.lang.String-">reconfigureProperty</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html" title="interface in org.apache.hadoop.conf">Reconfigurable</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/ReconfigurationException.html" title="class in org.apache.hadoop.conf">ReconfigurationException</a></code></dd>
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<h4>getReconfigurableProperties</h4>
<pre>public abstract&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<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>&gt;&nbsp;getReconfigurableProperties()</pre>
<div class="block">Return all the properties that can be changed at run time.
Subclasses must override this.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html#getReconfigurableProperties--">getReconfigurableProperties</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html" title="interface in org.apache.hadoop.conf">Reconfigurable</a></code></dd>
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<pre>public&nbsp;boolean&nbsp;isPropertyReconfigurable(<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;property)</pre>
<div class="block">Return whether a given property is changeable at run time.
If isPropertyReconfigurable returns true for a property,
then changeConf should not throw an exception when changing
this property.
Subclasses may wish to override this with a more efficient implementation.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html#isPropertyReconfigurable-java.lang.String-">isPropertyReconfigurable</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Reconfigurable.html" title="interface in org.apache.hadoop.conf">Reconfigurable</a></code></dd>
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<h4>reconfigurePropertyImpl</h4>
<pre>protected abstract&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;reconfigurePropertyImpl(<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;property,
<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;newVal)
throws <a href="../../../../org/apache/hadoop/conf/ReconfigurationException.html" title="class in org.apache.hadoop.conf">ReconfigurationException</a></pre>
<div class="block">Change a configuration property.
Subclasses must override this. This method applies the change to
all internal data structures derived from the configuration property
that is being changed. If this object owns other Reconfigurable objects
reconfigureProperty should be called recursively to make sure that
the configuration of these objects are updated.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>property</code> - Name of the property that is being reconfigured.</dd>
<dd><code>newVal</code> - Proposed new value of the property.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Effective new value of the property. This may be different from
newVal.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/ReconfigurationException.html" title="class in org.apache.hadoop.conf">ReconfigurationException</a></code> - if there was an error applying newVal.</dd>
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