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<div class="subTitle">org.apache.hadoop.hdfs.server.blockmanagement</div>
<h2 title="Class DatanodeAdminBackoffMonitor" class="title">Class DatanodeAdminBackoffMonitor</h2>
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<li><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminMonitorBase</a></li>
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<li>org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor</li>
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<pre>public class <span class="typeNameLabel">DatanodeAdminBackoffMonitor</span>
extends <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorBase</a>
implements <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorInterface</a></pre>
<div class="block">This class implements the logic to track decommissioning and entering
maintenance nodes, ensure all their blocks are adequately replicated
before they are moved to the decommissioned or maintenance state.
This monitor avoids flooding the replication queue with all pending blocks
and instead feeds them to the queue as the prior set complete replication.
HDFS-14854 contains details about the overall design of this class.</div>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hdfs.server.blockmanagement.<a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorBase</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#blockManager">blockManager</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#conf">conf</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#dnAdmin">dnAdmin</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#maxConcurrentTrackedNodes">maxConcurrentTrackedNodes</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#namesystem">namesystem</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#pendingNodes">pendingNodes</a></code></li>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html#getNumNodesChecked--">getNumNodesChecked</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html#getTrackedNodeCount--">getTrackedNodeCount</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html#processConf--">processConf</a></span>()</code>
<div class="block">Abstract method which must be implemented by the sub-classes to process
set various instance variables from the Configuration passed at object
creation time.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html#run--">run</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.html#stopTrackingNode-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor-">stopTrackingNode</a></span>(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor&nbsp;dn)</code>
<div class="block">Queue a node to be removed from tracking.</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hdfs.server.blockmanagement.<a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorBase</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#getConf--">getConf</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#getPendingNodeCount--">getPendingNodeCount</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#getPendingNodes--">getPendingNodes</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#setBlockManager-org.apache.hadoop.hdfs.server.blockmanagement.BlockManager-">setBlockManager</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#setDatanodeAdminManager-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager-">setDatanodeAdminManager</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#setNameSystem-org.apache.hadoop.hdfs.server.namenode.Namesystem-">setNameSystem</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#startTrackingNode-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor-">startTrackingNode</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.hdfs.server.blockmanagement.<a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorInterface</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#getPendingNodeCount--">getPendingNodeCount</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#getPendingNodes--">getPendingNodes</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#setBlockManager-org.apache.hadoop.hdfs.server.blockmanagement.BlockManager-">setBlockManager</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#setDatanodeAdminManager-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager-">setDatanodeAdminManager</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#setNameSystem-org.apache.hadoop.hdfs.server.namenode.Namesystem-">setNameSystem</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#startTrackingNode-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor-">startTrackingNode</a></code></li>
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<h4>processConf</h4>
<pre>protected&nbsp;void&nbsp;processConf()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#processConf--">DatanodeAdminMonitorBase</a></code></span></div>
<div class="block">Abstract method which must be implemented by the sub-classes to process
set various instance variables from the Configuration passed at object
creation time.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html#processConf--">processConf</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.html" title="class in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorBase</a></code></dd>
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<h4>stopTrackingNode</h4>
<pre>public&nbsp;void&nbsp;stopTrackingNode(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor&nbsp;dn)</pre>
<div class="block">Queue a node to be removed from tracking. This method must be called
under the namenode write lock.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#stopTrackingNode-org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor-">stopTrackingNode</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorInterface</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dn</code> - The datanode to stop tracking for decommission.</dd>
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<h4>getTrackedNodeCount</h4>
<pre>public&nbsp;int&nbsp;getTrackedNodeCount()</pre>
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<dd><code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html#getTrackedNodeCount--">getTrackedNodeCount</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorInterface.html" title="interface in org.apache.hadoop.hdfs.server.blockmanagement">DatanodeAdminMonitorInterface</a></code></dd>
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<pre>public&nbsp;int&nbsp;getNumNodesChecked()</pre>
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<pre>public&nbsp;void&nbsp;run()</pre>
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