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<div class="subTitle">org.apache.hadoop.lib.service.hadoop</div>
<h2 title="Class FileSystemAccessService" class="title">Class FileSystemAccessService</h2>
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<ul class="inheritance">
<li>org.apache.hadoop.lib.service.hadoop.FileSystemAccessService</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/hadoop/lib/server/Service.html" title="interface in org.apache.hadoop.lib.server">Service</a>, <a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</a></dd>
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<pre>@InterfaceAudience.Private
public class <span class="typeNameLabel">FileSystemAccessService</span>
extends <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html" title="class in org.apache.hadoop.lib.server">BaseService</a>
implements <a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</a></pre>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.lib.service.<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</a></h3>
<code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.FileSystemExecutor.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess.FileSystemExecutor</a>&lt;<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.FileSystemExecutor.html" title="type parameter in FileSystemAccess.FileSystemExecutor">T</a>&gt;</code></li>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>static <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/lib/service/hadoop/FileSystemAccessService.html#AUTHENTICATION_TYPE">AUTHENTICATION_TYPE</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <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/lib/service/hadoop/FileSystemAccessService.html#FS_CACHE_PURGE_FREQUENCY">FS_CACHE_PURGE_FREQUENCY</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <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/lib/service/hadoop/FileSystemAccessService.html#FS_CACHE_PURGE_TIMEOUT">FS_CACHE_PURGE_TIMEOUT</a></span></code>&nbsp;</td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#HADOOP_CONF_DIR">HADOOP_CONF_DIR</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <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/lib/service/hadoop/FileSystemAccessService.html#KERBEROS_KEYTAB">KERBEROS_KEYTAB</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <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>
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<td class="colFirst"><code>static <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/lib/service/hadoop/FileSystemAccessService.html#PREFIX">PREFIX</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#FileSystemAccessService--">FileSystemAccessService</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#checkNameNodeHealth-org.apache.hadoop.fs.FileSystem-">checkNameNodeHealth</a></span>(org.apache.hadoop.fs.FileSystem&nbsp;fileSystem)</code>&nbsp;</td>
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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#closeFileSystem-org.apache.hadoop.fs.FileSystem-">closeFileSystem</a></span>(org.apache.hadoop.fs.FileSystem&nbsp;fs)</code>&nbsp;</td>
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<td class="colFirst"><code>protected org.apache.hadoop.fs.FileSystem</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#createFileSystem-org.apache.hadoop.conf.Configuration-">createFileSystem</a></span>(org.apache.hadoop.conf.Configuration&nbsp;namenodeConf)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.fs.FileSystem</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#createFileSystem-java.lang.String-org.apache.hadoop.conf.Configuration-">createFileSystem</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;user,
org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.fs.FileSystem</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#createFileSystemInternal-java.lang.String-org.apache.hadoop.conf.Configuration-">createFileSystemInternal</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;user,
org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#execute-java.lang.String-org.apache.hadoop.conf.Configuration-org.apache.hadoop.lib.service.FileSystemAccess.FileSystemExecutor-">execute</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;user,
org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.FileSystemExecutor.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess.FileSystemExecutor</a>&lt;T&gt;&nbsp;executor)</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.conf.Configuration</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#getFileSystemConfiguration--">getFileSystemConfiguration</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#getInterface--">getInterface</a></span>()</code>
<div class="block">Returns the interface implemented by this service.</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#getServiceDependencies--">getServiceDependencies</a></span>()</code>
<div class="block">Returns the service dependencies of this service.</div>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>protected org.apache.hadoop.security.UserGroupInformation</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#getUGI-java.lang.String-">getUGI</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;user)</code>&nbsp;</td>
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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#init--">init</a></span>()</code>
<div class="block">Initializes the server.</div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#postInit--">postInit</a></span>()</code>
<div class="block">Post initializes the service.</div>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#releaseFileSystem-org.apache.hadoop.fs.FileSystem-">releaseFileSystem</a></span>(org.apache.hadoop.fs.FileSystem&nbsp;fs)</code>&nbsp;</td>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#setRequiredServiceHadoopConf-org.apache.hadoop.conf.Configuration-">setRequiredServiceHadoopConf</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.html#validateNamenode-java.lang.String-">validateNamenode</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;namenode)</code>&nbsp;</td>
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<code><a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#destroy--">destroy</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#getPrefix--">getPrefix</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#getPrefixedName-java.lang.String-">getPrefixedName</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#getServer--">getServer</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#getServiceConfig--">getServiceConfig</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#init-org.apache.hadoop.lib.server.Server-">init</a>, <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#serverStatusChange-org.apache.hadoop.lib.server.Server.Status-org.apache.hadoop.lib.server.Server.Status-">serverStatusChange</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final&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> PREFIX</pre>
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<pre>public static final&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> AUTHENTICATION_TYPE</pre>
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<pre>public static final&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> NAME_NODE_WHITELIST</pre>
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<pre>public static final&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> HADOOP_CONF_DIR</pre>
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<pre>public&nbsp;FileSystemAccessService()</pre>
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throws <a href="../../../../../../org/apache/hadoop/lib/server/ServiceException.html" title="class in org.apache.hadoop.lib.server">ServiceException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#init--">BaseService</a></code></span></div>
<div class="block">Initializes the server.
<p>
This method is called by <a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#init-org.apache.hadoop.lib.server.Server-"><code>BaseService.init(Server)</code></a> after all service properties
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<dt><span class="throwsLabel">Throws:</span></dt>
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<h4>postInit</h4>
<pre>public&nbsp;void&nbsp;postInit()
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<div class="block">Post initializes the service. This method is called by the
<a href="../../../../../../org/apache/hadoop/lib/server/Server.html" title="class in org.apache.hadoop.lib.server"><code>Server</code></a> after all services of the server have been initialized.
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This method does a NOP.</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html#postInit--">postInit</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/hadoop/lib/server/BaseService.html" title="class in org.apache.hadoop.lib.server">BaseService</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/server/ServiceException.html" title="class in org.apache.hadoop.lib.server">ServiceException</a></code> - thrown if the service could not be
post-initialized.</dd>
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<h4>getInterface</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&nbsp;getInterface()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/lib/server/Service.html#getInterface--">Service</a></code></span></div>
<div class="block">Returns the interface implemented by this service. This interface is used
the <a href="../../../../../../org/apache/hadoop/lib/server/Server.html" title="class in org.apache.hadoop.lib.server"><code>Server</code></a> when the <a href="../../../../../../org/apache/hadoop/lib/server/Server.html#get-java.lang.Class-"><code>Server.get(Class)</code></a> method is used to
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>[]&nbsp;getServiceDependencies()</pre>
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<div class="block">Returns the service dependencies of this service. The service will be
instantiated only if all the service dependencies are already initialized.
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This method returns an empty array (size 0)</div>
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<pre>protected&nbsp;org.apache.hadoop.security.UserGroupInformation&nbsp;getUGI(<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;user)
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<dt><span class="throwsLabel">Throws:</span></dt>
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<pre>protected&nbsp;org.apache.hadoop.fs.FileSystem&nbsp;createFileSystem(org.apache.hadoop.conf.Configuration&nbsp;namenodeConf)
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<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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<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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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></code></dd>
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<pre>protected&nbsp;void&nbsp;checkNameNodeHealth(org.apache.hadoop.fs.FileSystem&nbsp;fileSystem)
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<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.FileSystemExecutor.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess.FileSystemExecutor</a>&lt;T&gt;&nbsp;executor)
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></code></dd>
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<pre>public&nbsp;org.apache.hadoop.fs.FileSystem&nbsp;createFileSystemInternal(<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;user,
org.apache.hadoop.conf.Configuration&nbsp;conf)
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>,
<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></pre>
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<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>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></code></dd>
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<pre>public&nbsp;org.apache.hadoop.fs.FileSystem&nbsp;createFileSystem(<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;user,
org.apache.hadoop.conf.Configuration&nbsp;conf)
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>,
<a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></pre>
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<dd><code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html#createFileSystem-java.lang.String-org.apache.hadoop.conf.Configuration-">createFileSystem</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</a></code></dd>
<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>
<dd><code><a href="../../../../../../org/apache/hadoop/lib/service/FileSystemAccessException.html" title="class in org.apache.hadoop.lib.service">FileSystemAccessException</a></code></dd>
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<pre>public&nbsp;void&nbsp;releaseFileSystem(org.apache.hadoop.fs.FileSystem&nbsp;fs)
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<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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