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<div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
<h2 title="Class RegionSplitPolicy" class="title">Class RegionSplitPolicy</h2>
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<li>org.apache.hadoop.conf.Configured</li>
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<li>org.apache.hadoop.hbase.regionserver.RegionSplitPolicy</li>
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<dt>All Implemented Interfaces:</dt>
<dd>org.apache.hadoop.conf.Configurable</dd>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">ConstantSizeRegionSplitPolicy</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/DisabledRegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">DisabledRegionSplitPolicy</a></dd>
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<pre>@InterfaceAudience.LimitedPrivate(value="Configuration")
public abstract class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.43">RegionSplitPolicy</a>
extends org.apache.hadoop.conf.Configured</pre>
<div class="block">A split policy determines when a Region should be split.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/SteppingSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver"><code>Default split policy since 2.0.0</code></a>,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver"><code>Default split policy since
0.94.0</code></a>,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver"><code>Default split policy before 0.94.0</code></a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#DEFAULT_SPLIT_POLICY_CLASS">DEFAULT_SPLIT_POLICY_CLASS</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#region">region</a></span></code>
<div class="block">The region configured for this split policy.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#RegionSplitPolicy--">RegionSplitPolicy</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#canSplit--">canSplit</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#configureForRegion-org.apache.hadoop.hbase.regionserver.HRegion-">configureForRegion</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a>&nbsp;region)</code>
<div class="block">Upon construction, this method will be called with the region
to be governed.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#create-org.apache.hadoop.hbase.regionserver.HRegion-org.apache.hadoop.conf.Configuration-">create</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a>&nbsp;region,
org.apache.hadoop.conf.Configuration&nbsp;conf)</code>
<div class="block">Create the RegionSplitPolicy configured for the given table.</div>
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<td class="colFirst"><code>protected byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#getSplitPoint--">getSplitPoint</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#getSplitPolicyClass-org.apache.hadoop.hbase.client.TableDescriptor-org.apache.hadoop.conf.Configuration-">getSplitPolicyClass</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/TableDescriptor.html" title="interface in org.apache.hadoop.hbase.client">TableDescriptor</a>&nbsp;htd,
org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<td class="colFirst"><code>protected abstract boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#shouldSplit--">shouldSplit</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#skipStoreFileRangeCheck-java.lang.String-">skipStoreFileRangeCheck</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;familyName)</code>
<div class="block">In <a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegionFileSystem.html#splitStoreFile-org.apache.hadoop.hbase.client.RegionInfo-java.lang.String-org.apache.hadoop.hbase.regionserver.HStoreFile-byte:A-boolean-org.apache.hadoop.hbase.regionserver.RegionSplitPolicy-"><code>HRegionFileSystem.splitStoreFile(org.apache.hadoop.hbase.client.RegionInfo, String,
HStoreFile, byte[], boolean, RegionSplitPolicy)</code></a> we are not creating the split reference
if split row does not lie inside the StoreFile range.</div>
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<pre>private static final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a>&gt; <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.45">DEFAULT_SPLIT_POLICY_CLASS</a></pre>
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<h4>region</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.53">region</a></pre>
<div class="block">The region configured for this split policy.
As of hbase-2.0.0, RegionSplitPolicy can be instantiated on the Master-side so the
Phoenix local-indexer can block default hbase behavior. This is an exotic usage. Should not
trouble any other users of RegionSplitPolicy.</div>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.43">RegionSplitPolicy</a>()</pre>
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<h4>configureForRegion</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.59">configureForRegion</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a>&nbsp;region)</pre>
<div class="block">Upon construction, this method will be called with the region
to be governed. It will be called once and only once.</div>
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<pre>protected abstract&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.71">shouldSplit</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the specified region should be split.</dd>
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<pre>protected&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.76">canSplit</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the specified region can be split.</dd>
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<pre>protected&nbsp;byte[]&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.86">getSplitPoint</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the key at which the region should be split, or null
if it cannot be split. This will only be called if shouldSplit
previously returned true.</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.111">create</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegion.html" title="class in org.apache.hadoop.hbase.regionserver">HRegion</a>&nbsp;region,
org.apache.hadoop.conf.Configuration&nbsp;conf)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Create the RegionSplitPolicy configured for the given table.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>region</code> - </dd>
<dd><code>conf</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a RegionSplitPolicy</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html" title="class in org.apache.hadoop.hbase.regionserver">RegionSplitPolicy</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.121">getSplitPolicyClass</a>(<a href="../../../../../org/apache/hadoop/hbase/client/TableDescriptor.html" title="interface in org.apache.hadoop.hbase.client">TableDescriptor</a>&nbsp;htd,
org.apache.hadoop.conf.Configuration&nbsp;conf)
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<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>protected&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionSplitPolicy.html#line.157">skipStoreFileRangeCheck</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;familyName)</pre>
<div class="block">In <a href="../../../../../org/apache/hadoop/hbase/regionserver/HRegionFileSystem.html#splitStoreFile-org.apache.hadoop.hbase.client.RegionInfo-java.lang.String-org.apache.hadoop.hbase.regionserver.HStoreFile-byte:A-boolean-org.apache.hadoop.hbase.regionserver.RegionSplitPolicy-"><code>HRegionFileSystem.splitStoreFile(org.apache.hadoop.hbase.client.RegionInfo, String,
HStoreFile, byte[], boolean, RegionSplitPolicy)</code></a> we are not creating the split reference
if split row does not lie inside the StoreFile range. But in some use cases we may need to
create the split reference even when the split row does not lie inside the StoreFile range.
This method can be used to decide, whether to skip the the StoreFile range check or not.
<p>This method is not for general use. It is a mechanism put in place by Phoenix
local indexing to defeat standard hbase behaviors. Phoenix local indices are very likely
the only folks who would make use of this method. On the Master-side, we will instantiate
a RegionSplitPolicy instance and run this method ONLY... none of the others make sense
on the Master-side.</p>
TODO: Shutdown this phoenix specialization or do it via some other means.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether to skip the StoreFile range check or not</dd>
</dl>
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