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<div class="subTitle">org.apache.hadoop.hdfs.server.blockmanagement</div>
<h2 title="Class HostFileManager" class="title">Class HostFileManager</h2>
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<li>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</li>
<li>
<ul class="inheritance">
<li>org.apache.hadoop.hdfs.server.blockmanagement.HostFileManager</li>
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<pre>public class <span class="typeNameLabel">HostFileManager</span>
extends org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</pre>
<div class="block">This class manages the include and exclude files for HDFS.
<p>
These files control which DataNodes the NameNode expects to see in the
cluster. Loosely speaking, the include file, if it exists and is not
empty, is a list of everything we expect to see. The exclude file is
a list of everything we want to ignore if we do see it.
<p>
Entries may or may not specify a port. If they don't, we consider
them to apply to every DataNode on that host. The code canonicalizes the
entries into IP addresses.
<p>
The code ignores all entries that the DNS fails to resolve their IP
addresses. This is okay because by default the NN rejects the registrations
of DNs when it fails to do a forward and reverse lookup. Note that DNS
resolutions are only done during the loading time to minimize the latency.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#HostFileManager--">HostFileManager</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>org.apache.hadoop.conf.Configuration</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#getConf--">getConf</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostSet.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#getExcludes--">getExcludes</a></span>()</code>
<div class="block">Return all datanodes that should be in decommissioned state.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostSet.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#getIncludes--">getIncludes</a></span>()</code>
<div class="block">Return all the datanodes that are allowed to connect to the namenode.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#getMaintenanceExpirationTimeInMS-org.apache.hadoop.hdfs.protocol.DatanodeID-">getMaintenanceExpirationTimeInMS</a></span>(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</code>
<div class="block">Get the maintenance expiration time in milli seconds.</div>
</td>
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<tr id="i4" class="altColor">
<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/hadoop/hdfs/server/blockmanagement/HostFileManager.html#getUpgradeDomain-org.apache.hadoop.hdfs.protocol.DatanodeID-">getUpgradeDomain</a></span>(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</code>
<div class="block">Get the upgrade domain of a datanode.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#isExcluded-org.apache.hadoop.hdfs.protocol.DatanodeID-">isExcluded</a></span>(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</code>
<div class="block">Check if a datanode needs to be decommissioned.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#isIncluded-org.apache.hadoop.hdfs.protocol.DatanodeID-">isIncluded</a></span>(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</code>
<div class="block">Check if a datanode is allowed to connect the namenode.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.html#refresh--">refresh</a></span>()</code>
<div class="block">Reload the configuration.</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/hdfs/server/blockmanagement/HostFileManager.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<h4>HostFileManager</h4>
<pre>public&nbsp;HostFileManager()</pre>
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<h4>setConf</h4>
<pre>public&nbsp;void&nbsp;setConf(org.apache.hadoop.conf.Configuration&nbsp;conf)</pre>
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<h4>getConf</h4>
<pre>public&nbsp;org.apache.hadoop.conf.Configuration&nbsp;getConf()</pre>
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<pre>public&nbsp;void&nbsp;refresh()
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"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Reload the configuration.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>refresh</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
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<h4>getIncludes</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostSet.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostSet</a>&nbsp;getIncludes()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Return all the datanodes that are allowed to connect to the namenode.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getIncludes</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Iterable of all datanodes</dd>
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<a name="getExcludes--">
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<h4>getExcludes</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/HostSet.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">HostSet</a>&nbsp;getExcludes()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Return all datanodes that should be in decommissioned state.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getExcludes</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Iterable of those datanodes</dd>
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<a name="isIncluded-org.apache.hadoop.hdfs.protocol.DatanodeID-">
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<h4>isIncluded</h4>
<pre>public&nbsp;boolean&nbsp;isIncluded(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Check if a datanode is allowed to connect the namenode.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>isIncluded</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dn</code> - the DatanodeID of the datanode</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>boolean if dn is allowed to connect the namenode.</dd>
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<pre>public&nbsp;boolean&nbsp;isExcluded(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Check if a datanode needs to be decommissioned.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>isExcluded</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dn</code> - the DatanodeID of the datanode</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>boolean if dn needs to be decommissioned.</dd>
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<h4>getUpgradeDomain</h4>
<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;getUpgradeDomain(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Get the upgrade domain of a datanode.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getUpgradeDomain</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dn</code> - the DatanodeID of the datanode</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the upgrade domain of dn.</dd>
</dl>
</li>
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<a name="getMaintenanceExpirationTimeInMS-org.apache.hadoop.hdfs.protocol.DatanodeID-">
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<h4>getMaintenanceExpirationTimeInMS</h4>
<pre>public&nbsp;long&nbsp;getMaintenanceExpirationTimeInMS(org.apache.hadoop.hdfs.protocol.DatanodeID&nbsp;dn)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></span></div>
<div class="block">Get the maintenance expiration time in milli seconds.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getMaintenanceExpirationTimeInMS</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.blockmanagement.HostConfigManager</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dn</code> - the DatanodeID of the datanode</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maintenance expiration time of dn.</dd>
</dl>
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