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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.hadoop.hbase.client</a></div>
<h1 title="Class RegionReplicaUtil" class="title">Class RegionReplicaUtil</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">org.apache.hadoop.hbase.client.RegionReplicaUtil</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="../util/ServerRegionReplicaUtil.html" title="class in org.apache.hadoop.hbase.util">ServerRegionReplicaUtil</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="annotations">@Private
</span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-30">RegionReplicaUtil</a></span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">Utility methods which contain the logic for regions and replicas.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- =========== FIELD SUMMARY =========== -->
<li>
<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="caption"><span>Fields</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Field</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>protected static final boolean</code></div>
<div class="col-second even-row-color"><code><a href="#DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH" class="member-name-link">DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>(package private) static final int</code></div>
<div class="col-second odd-row-color"><code><a href="#DEFAULT_REPLICA_ID" class="member-name-link">DEFAULT_REPLICA_ID</a></code></div>
<div class="col-last odd-row-color">
<div class="block">The default replicaId for the region</div>
</div>
<div class="col-first even-row-color"><code>static final <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color"><code><a href="#REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY" class="member-name-link">REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY</a></code></div>
<div class="col-last even-row-color">
<div class="block">Whether or not the secondary region will wait for observing a flush / region open event from
the primary region via async wal replication before enabling read requests.</div>
</div>
</div>
</section>
</li>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">RegionReplicaUtil</a>()</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
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<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#addReplicas(java.util.List,int,int)" class="member-name-link">addReplicas</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
int&nbsp;oldReplicaCount,
int&nbsp;newReplicaCount)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Create any replicas for the regions (the default replicas that was already created is passed to
the method)</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>private static int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#compareRegionInfosWithoutReplicaId(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.client.RegionInfo)" class="member-name-link">compareRegionInfosWithoutReplicaId</a><wbr>(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoA,
<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoB)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getRegionInfoForDefaultReplica(org.apache.hadoop.hbase.client.RegionInfo)" class="member-name-link">getRegionInfoForDefaultReplica</a><wbr>(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns the RegionInfo for the default replicaId (0).</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getRegionInfoForReplica(org.apache.hadoop.hbase.client.RegionInfo,int)" class="member-name-link">getRegionInfoForReplica</a><wbr>(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
int&nbsp;replicaId)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns the RegionInfo for the given replicaId.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isDefaultReplica(int)" class="member-name-link">isDefaultReplica</a><wbr>(int&nbsp;replicaId)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns true if this replicaId corresponds to default replica for the region</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isDefaultReplica(org.apache.hadoop.hbase.client.RegionInfo)" class="member-name-link">isDefaultReplica</a><wbr>(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;hri)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns true if this region is a default replica for the region</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isReplicasForSameRegion(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.client.RegionInfo)" class="member-name-link">isReplicasForSameRegion</a><wbr>(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoA,
<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoB)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#removeNonDefaultRegions(java.util.Collection)" class="member-name-link">removeNonDefaultRegions</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Removes the non-default replicas from the passed regions collection</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
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</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ FIELD DETAIL =========== -->
<li>
<section class="field-details" id="field-detail">
<h2>Field Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY">
<h3>REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-42">REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY</a></span></div>
<div class="block">Whether or not the secondary region will wait for observing a flush / region open event from
the primary region via async wal replication before enabling read requests. Since replayed
edits from async wal replication from primary is not persisted in WAL, the memstore of the
secondary region might be non-empty at the time of close or crash. For ensuring seqId's not
"going back in time" in the secondary region replica, this should be enabled. However, in some
cases the above semantics might be ok for some application classes. See HBASE-11580 for more
context.</div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="../../../../../constant-values.html#org.apache.hadoop.hbase.client.RegionReplicaUtil.REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH">
<h3>DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH</h3>
<div class="member-signature"><span class="modifiers">protected static final</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-44">DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH</a></span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="../../../../../constant-values.html#org.apache.hadoop.hbase.client.RegionReplicaUtil.DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="DEFAULT_REPLICA_ID">
<h3>DEFAULT_REPLICA_ID</h3>
<div class="member-signature"><span class="modifiers">static final</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-49">DEFAULT_REPLICA_ID</a></span></div>
<div class="block">The default replicaId for the region</div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="../../../../../constant-values.html#org.apache.hadoop.hbase.client.RegionReplicaUtil.DEFAULT_REPLICA_ID">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>RegionReplicaUtil</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-31">RegionReplicaUtil</a></span>()</div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="getRegionInfoForReplica(org.apache.hadoop.hbase.client.RegionInfo,int)">
<h3>getRegionInfoForReplica</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-58">getRegionInfoForReplica</a></span><wbr><span class="parameters">(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
int&nbsp;replicaId)</span></div>
<div class="block">Returns the RegionInfo for the given replicaId. RegionInfo's correspond to a range of a table,
but more than one "instance" of the same range can be deployed which are differentiated by the
replicaId.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>an RegionInfo object corresponding to the same range (table, start and end key), but
for the given replicaId.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getRegionInfoForDefaultReplica(org.apache.hadoop.hbase.client.RegionInfo)">
<h3>getRegionInfoForDefaultReplica</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-72">getRegionInfoForDefaultReplica</a></span><wbr><span class="parameters">(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</span></div>
<div class="block">Returns the RegionInfo for the default replicaId (0). RegionInfo's correspond to a range of a
table, but more than one "instance" of the same range can be deployed which are differentiated
by the replicaId.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>an RegionInfo object corresponding to the same range (table, start and end key), but
for the default replicaId.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isDefaultReplica(int)">
<h3>isDefaultReplica</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-77">isDefaultReplica</a></span><wbr><span class="parameters">(int&nbsp;replicaId)</span></div>
<div class="block">Returns true if this replicaId corresponds to default replica for the region</div>
</section>
</li>
<li>
<section class="detail" id="isDefaultReplica(org.apache.hadoop.hbase.client.RegionInfo)">
<h3>isDefaultReplica</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-82">isDefaultReplica</a></span><wbr><span class="parameters">(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;hri)</span></div>
<div class="block">Returns true if this region is a default replica for the region</div>
</section>
</li>
<li>
<section class="detail" id="removeNonDefaultRegions(java.util.Collection)">
<h3>removeNonDefaultRegions</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-89">removeNonDefaultRegions</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions)</span></div>
<div class="block">Removes the non-default replicas from the passed regions collection</div>
</section>
</li>
<li>
<section class="detail" id="isReplicasForSameRegion(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.client.RegionInfo)">
<h3>isReplicasForSameRegion</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-99">isReplicasForSameRegion</a></span><wbr><span class="parameters">(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoA,
<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoB)</span></div>
</section>
</li>
<li>
<section class="detail" id="compareRegionInfosWithoutReplicaId(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.client.RegionInfo)">
<h3>compareRegionInfosWithoutReplicaId</h3>
<div class="member-signature"><span class="modifiers">private static</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-103">compareRegionInfosWithoutReplicaId</a></span><wbr><span class="parameters">(<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoA,
<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfoB)</span></div>
</section>
</li>
<li>
<section class="detail" id="addReplicas(java.util.List,int,int)">
<h3>addReplicas</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegionReplicaUtil.html#line-147">addReplicas</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
int&nbsp;oldReplicaCount,
int&nbsp;newReplicaCount)</span></div>
<div class="block">Create any replicas for the regions (the default replicas that was already created is passed to
the method)</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>regions</code> - existing regions</dd>
<dd><code>oldReplicaCount</code> - existing replica count</dd>
<dd><code>newReplicaCount</code> - updated replica count due to modify table</dd>
<dt>Returns:</dt>
<dd>the combined list of default and non-default replicas</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
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