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<div class="subTitle">org.apache.hadoop.hbase.master.replication</div>
<h2 title="Class SyncReplicationReplayWALManager.UsedReplayWorkersForPeer" class="title">Class SyncReplicationReplayWALManager.UsedReplayWorkersForPeer</h2>
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<li>org.apache.hadoop.hbase.master.replication.SyncReplicationReplayWALManager.UsedReplayWorkersForPeer</li>
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<pre>private static final class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.html#line.101">SyncReplicationReplayWALManager.UsedReplayWorkersForPeer</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">This class is used to record the used workers(region servers) for a replication peer. For
balancing the replaying remote wal job, we will only schedule one remote replay procedure each
time. So when acquiring a worker, we will first get all the region servers for this cluster,
and then filter out the used ones.
<p/>
The <a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureEvent.html" title="class in org.apache.hadoop.hbase.procedure2"><code>ProcedureEvent</code></a> is used for notifying procedures that there are available workers
now. We used to use sleeping and retrying before, but if the interval is too large, for
example, exponential backoff, then it is not effective, but if the interval is too small, then
we will flood the procedure wal.
<p/>
The states are only kept in memory, so when restarting, we need to reconstruct these
information, using the information stored in related procedures. See the <code>afterReplay</code>
method in <a href="../../../../../../org/apache/hadoop/hbase/master/replication/RecoverStandbyProcedure.html" title="class in org.apache.hadoop.hbase.master.replication"><code>RecoverStandbyProcedure</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALProcedure.html" title="class in org.apache.hadoop.hbase.master.replication"><code>SyncReplicationReplayWALProcedure</code></a> for
more details.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<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/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#event">event</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#usedWorkers">usedWorkers</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#UsedReplayWorkersForPeer-java.lang.String-">UsedReplayWorkersForPeer</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;peerId)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#release-org.apache.hadoop.hbase.ServerName-">release</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#suspend-org.apache.hadoop.hbase.procedure2.Procedure-">suspend</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#used-org.apache.hadoop.hbase.ServerName-">used</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#wake-org.apache.hadoop.hbase.master.procedure.MasterProcedureScheduler-">wake</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureScheduler.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureScheduler</a>&nbsp;scheduler)</code>&nbsp;</td>
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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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<h3>Field Detail</h3>
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<h4>usedWorkers</h4>
<pre>private final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt; <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.103">usedWorkers</a></pre>
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<pre>private final&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureEvent.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureEvent</a>&lt;?&gt; <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.105">event</a></pre>
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<pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.107">UsedReplayWorkersForPeer</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;peerId)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.111">used</a>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.115">acquire</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/ServerManager.html" title="class in org.apache.hadoop.hbase.master">ServerManager</a>&nbsp;serverManager)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.122">release</a>(<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.126">suspend</a>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/replication/SyncReplicationReplayWALManager.UsedReplayWorkersForPeer.html#line.131">wake</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureScheduler.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureScheduler</a>&nbsp;scheduler)</pre>
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