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<div class="subTitle">org.apache.hadoop.hbase.master.assignment</div>
<h2 title="Class RegionStateNode" class="title">Class RegionStateNode</h2>
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<dt>All Implemented Interfaces:</dt>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#line.68">RegionStateNode</a>
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>
implements <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStateNode</a>&gt;</pre>
<div class="block">Current Region State. Most fields are synchronized with meta region, i.e, we will update meta
immediately after we modify this RegionStateNode, and usually under the lock. The only exception
is <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#lastHost"><code>lastHost</code></a>, which should not be used for critical condition.
<p/>
Typically, the only way to modify this class is through <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/TransitRegionStateProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>TransitRegionStateProcedure</code></a>, and
we will record the TRSP along with this RegionStateNode to make sure that there could at most one
TRSP. For other operations, such as SCP, we will first get the lock, and then try to schedule a
TRSP. If there is already one, then the solution will be different:
<ul>
<li>For SCP, we will update the region state in meta to tell the TRSP to retry.</li>
<li>For DisableTableProcedure, as we have the xlock, we can make sure that the TRSP has not been
executed yet, so just unset it and attach a new one. The original one will quit immediately when
executing.</li>
<li>For split/merge, we will fail immediately as there is no actual operations yet so no
harm.</li>
<li>For EnableTableProcedure/TruncateTableProcedure, we can make sure that there will be no TRSP
attached with the RSNs.</li>
<li>For other procedures, you'd better use ReopenTableRegionsProcedure. The RTRP will take care
of lots of corner cases when reopening regions.</li>
</ul>
<p/>
Several fields are declared with <code>volatile</code>, which means you are free to get it without
lock, but usually you should not use these fields without locking for critical condition, as it
will be easily to introduce inconsistency. For example, you are free to dump the status and show
it on web without locking, but if you want to change the state of the RegionStateNode by checking
the current state, you'd better have the lock...</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.AssignmentProcedureEvent.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStateNode.AssignmentProcedureEvent</a></span></code>&nbsp;</td>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureEvent.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureEvent</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#event">event</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#lastHost">lastHost</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#lastUpdate">lastUpdate</a></span></code>
<div class="block">Updated whenever a call to <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#setRegionLocation-org.apache.hadoop.hbase.ServerName-"><code>setRegionLocation(ServerName)</code></a> or
<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#setState-org.apache.hadoop.hbase.master.RegionState.State-org.apache.hadoop.hbase.master.RegionState.State...-"><code>setState(RegionState.State, RegionState.State...)</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks">Lock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#lock">lock</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#LOG">LOG</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#openSeqNum">openSeqNum</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/TransitRegionStateProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment">TransitRegionStateProcedure</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#procedure">procedure</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#regionInfo">regionInfo</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#regionLocation">regionLocation</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentMap</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStateNode</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#ritMap">ritMap</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/master/RegionState.State.html" title="enum in org.apache.hadoop.hbase.master">RegionState.State</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#state">state</a></span></code>
<div class="block">A Region-in-Transition (RIT) moves through states.</div>
</td>
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</li>
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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/hbase/master/assignment/RegionStateNode.html#RegionStateNode-org.apache.hadoop.hbase.client.RegionInfo-java.util.concurrent.ConcurrentMap-">RegionStateNode</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentMap</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStateNode</a>&gt;&nbsp;ritMap)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#checkOnline--">checkOnline</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#compareTo-org.apache.hadoop.hbase.master.assignment.RegionStateNode-">compareTo</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStateNode</a>&nbsp;other)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#equals-java.lang.Object-">equals</a></span>(<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>&nbsp;other)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getFormatVersion--">getFormatVersion</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getLastHost--">getLastHost</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getLastUpdate--">getLastUpdate</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getOpenSeqNum--">getOpenSeqNum</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/TransitRegionStateProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment">TransitRegionStateProcedure</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getProcedure--">getProcedure</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureEvent.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureEvent</a>&lt;?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getProcedureEvent--">getProcedureEvent</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getRegionInfo--">getRegionInfo</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getRegionLocation--">getRegionLocation</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/master/RegionState.State.html" title="enum in org.apache.hadoop.hbase.master">RegionState.State</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getState--">getState</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#getTable--">getTable</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#isInState-org.apache.hadoop.hbase.master.RegionState.State...-">isInState</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/RegionState.State.html" title="enum in org.apache.hadoop.hbase.master">RegionState.State</a>...&nbsp;expected)</code>
<div class="block">Notice that, we will return true if <code>expected</code> is empty.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#isInTransition--">isInTransition</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#isStuck--">isStuck</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#isSystemTable--">isSystemTable</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#lock--">lock</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#offline--">offline</a></span>()</code>
<div class="block">Put region into OFFLINE mode (set state and clear location).</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#setLastHost-org.apache.hadoop.hbase.ServerName-">setLastHost</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#setProcedure-org.apache.hadoop.hbase.master.assignment.TransitRegionStateProcedure-">setProcedure</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/TransitRegionStateProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment">TransitRegionStateProcedure</a>&nbsp;proc)</code>&nbsp;</td>
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<tr id="i23" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#setRegionLocation-org.apache.hadoop.hbase.ServerName-">setRegionLocation</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</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/hbase/master/assignment/RegionStateNode.html#setState-org.apache.hadoop.hbase.master.RegionState.State-org.apache.hadoop.hbase.master.RegionState.State...-">setState</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/RegionState.State.html" title="enum in org.apache.hadoop.hbase.master">RegionState.State</a>&nbsp;update,
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#toDescriptiveString--">toDescriptiveString</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>
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<a href="../../../../../../org/apache/hadoop/hbase/master/RegionState.State.html" title="enum in org.apache.hadoop.hbase.master">RegionState.State</a>...&nbsp;expected)</code>
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<tr id="i30" class="altColor">
<td class="colFirst"><code>void</code></td>
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<tr id="i31" class="rowColor">
<td class="colFirst"><code>void</code></td>
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<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>update</code> - new region state this node should be assigned.</dd>
<dd><code>expected</code> - current state should be in this given list of expected states</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true, if current state is in expected list; otherwise false.</dd>
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<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Last recorded server deploy</dd>
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<p/>
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<pre>public&nbsp;boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNode.html#line.223">isSystemTable</a>()</pre>
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