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<div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
<h2 title="Class ScannerIdGenerator" class="title">Class ScannerIdGenerator</h2>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.36">ScannerIdGenerator</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></pre>
<div class="block">Generate a new style scanner id to prevent collision with previous started server or other RSs.
We have 64 bits to use.
The first 32 bits are MurmurHash32 of ServerName string "host,port,ts".
The ServerName contains both host, port, and start timestamp so it can prevent collision.
The lowest 32bit is generated by atomic int.</div>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#scannerIdGen">scannerIdGen</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#serverNameHash">serverNameHash</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#generateNewScannerId--">generateNewScannerId</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static void</code></td>
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<pre>private final&nbsp;long <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.38">serverNameHash</a></pre>
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<pre>private final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.39">scannerIdGen</a></pre>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.41">ScannerIdGenerator</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</pre>
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<pre>public&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.47">generateNewScannerId</a>()</pre>
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<pre>public static&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.html#line.51">main</a>(<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;args)</pre>
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