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<div class="subTitle">org.apache.hadoop.hdfs.server.diskbalancer.datamodel</div>
<h2 title="Class DiskBalancerVolumeSet" class="title">Class DiskBalancerVolumeSet</h2>
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<li>org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolumeSet</li>
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<pre>public class <span class="typeNameLabel">DiskBalancerVolumeSet</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">DiskBalancerVolumeSet is a collection of storage devices on the
data node which are of similar StorageType.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#DiskBalancerVolumeSet--">DiskBalancerVolumeSet</a></span>()</code>
<div class="block">Constructs Empty DiskNBalanceVolumeSet.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#DiskBalancerVolumeSet-boolean-">DiskBalancerVolumeSet</a></span>(boolean&nbsp;isTransient)</code>
<div class="block">Constructs a DiskBalancerVolumeSet.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#DiskBalancerVolumeSet-org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolumeSet-">DiskBalancerVolumeSet</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolumeSet</a>&nbsp;volumeSet)</code>
<div class="block">Constructs a new DiskBalancerVolumeSet.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#addVolume-org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolume-">addVolume</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&nbsp;volume)</code>
<div class="block">adds a given volume into this volume set.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#computeVolumeDataDensity--">computeVolumeDataDensity</a></span>()</code>
<div class="block">Computes Volume Data Density.</div>
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<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getIdealUsed--">getIdealUsed</a></span>()</code>
<div class="block">Gets the idealUsed for this volume set.</div>
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<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/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getSetID--">getSetID</a></span>()</code>
<div class="block">Get Volume Set ID.</div>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getSortedQueue--">getSortedQueue</a></span>()</code>&nbsp;</td>
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<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/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getStorageType--">getStorageType</a></span>()</code>
<div class="block">Get Storage Type.</div>
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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/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getVolumeCount--">getVolumeCount</a></span>()</code>
<div class="block">Returns the number of volumes in the Volume Set.</div>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#getVolumes--">getVolumes</a></span>()</code>
<div class="block">Returns a list diskVolumes that are part of this volume set.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#isBalancingNeeded-double-">isBalancingNeeded</a></span>(double&nbsp;thresholdPercentage)</code>
<div class="block">Computes whether we need to do any balancing on this volume Set at all.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#isTransient--">isTransient</a></span>()</code>
<div class="block">Tells us if this volumeSet is transient.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#removeVolume-org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolume-">removeVolume</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&nbsp;volume)</code>
<div class="block">Remove a volume from the current set.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#setSetID-java.lang.String-">setSetID</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;volID)</code>
<div class="block">Set VolumeSet ID.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#setStorageType-java.lang.String-">setStorageType</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;typeOfStorage)</code>
<div class="block">Set Storage Type.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html#setTransient-boolean-">setTransient</a></span>(boolean&nbsp;transientValue)</code>
<div class="block">Set the transient properties for this volumeSet.</div>
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<h4>DiskBalancerVolumeSet</h4>
<pre>public&nbsp;DiskBalancerVolumeSet()</pre>
<div class="block">Constructs Empty DiskNBalanceVolumeSet.
This is needed by jackson</div>
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<pre>public&nbsp;DiskBalancerVolumeSet(boolean&nbsp;isTransient)</pre>
<div class="block">Constructs a DiskBalancerVolumeSet.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>isTransient</code> - - boolean</dd>
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<pre>public&nbsp;DiskBalancerVolumeSet(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolumeSet.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolumeSet</a>&nbsp;volumeSet)</pre>
<div class="block">Constructs a new DiskBalancerVolumeSet.</div>
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<h4>isTransient</h4>
<pre>public&nbsp;boolean&nbsp;isTransient()</pre>
<div class="block">Tells us if this volumeSet is transient.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>- true or false</dd>
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<pre>public&nbsp;void&nbsp;setTransient(boolean&nbsp;transientValue)</pre>
<div class="block">Set the transient properties for this volumeSet.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>transientValue</code> - - Boolean</dd>
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<pre>public&nbsp;void&nbsp;computeVolumeDataDensity()</pre>
<div class="block">Computes Volume Data Density. Adding a new volume changes
the volumeDataDensity for all volumes. So we throw away
our priority queue and recompute everything.
we discard failed volumes from this computation.
totalCapacity = totalCapacity of this volumeSet
totalUsed = totalDfsUsed for this volumeSet
idealUsed = totalUsed / totalCapacity
dfsUsedRatio = dfsUsedOnAVolume / Capacity On that Volume
volumeDataDensity = idealUsed - dfsUsedRatio</div>
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<pre>public&nbsp;int&nbsp;getVolumeCount()</pre>
<div class="block">Returns the number of volumes in the Volume Set.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>int</dd>
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<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;getStorageType()</pre>
<div class="block">Get Storage Type.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>String</dd>
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<pre>public&nbsp;void&nbsp;setStorageType(<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;typeOfStorage)</pre>
<div class="block">Set Storage Type.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>typeOfStorage</code> - -- StorageType</dd>
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<h4>addVolume</h4>
<pre>public&nbsp;void&nbsp;addVolume(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&nbsp;volume)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">adds a given volume into this volume set.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>volume</code> - - volume to add.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&gt;&nbsp;getVolumes()</pre>
<div class="block">Returns a list diskVolumes that are part of this volume set.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List</dd>
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<h4>getSortedQueue</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&gt;&nbsp;getSortedQueue()</pre>
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<pre>public&nbsp;boolean&nbsp;isBalancingNeeded(double&nbsp;thresholdPercentage)</pre>
<div class="block">Computes whether we need to do any balancing on this volume Set at all.
It checks if any disks are out of threshold value</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>thresholdPercentage</code> - - threshold - in percentage</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if balancing is needed false otherwise.</dd>
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<pre>public&nbsp;void&nbsp;removeVolume(<a href="../../../../../../../org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.html" title="class in org.apache.hadoop.hdfs.server.diskbalancer.datamodel">DiskBalancerVolume</a>&nbsp;volume)</pre>
<div class="block">Remove a volume from the current set.
This call does not recompute the volumeDataDensity. It has to be
done manually after this call.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>volume</code> - - Volume to remove</dd>
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<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;getSetID()</pre>
<div class="block">Get Volume Set ID.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>String</dd>
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<pre>public&nbsp;void&nbsp;setSetID(<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;volID)</pre>
<div class="block">Set VolumeSet ID.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>volID</code> - String</dd>
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<pre>public&nbsp;double&nbsp;getIdealUsed()</pre>
<div class="block">Gets the idealUsed for this volume set.</div>
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