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<div class="subTitle">org.apache.hadoop.hbase.io</div>
<h2 title="Class HalfStoreFileReader" class="title">Class HalfStoreFileReader</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.StoreFileReader</a></li>
<li>
<ul class="inheritance">
<li>org.apache.hadoop.hbase.io.HalfStoreFileReader</li>
</ul>
</li>
</ul>
</li>
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<br>
<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.56">HalfStoreFileReader</a>
extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></pre>
<div class="block">A facade for a <a href="../../../../../org/apache/hadoop/hbase/io/hfile/HFile.Reader.html" title="interface in org.apache.hadoop.hbase.io.hfile"><code>HFile.Reader</code></a> that serves up
either the top or bottom half of a HFile where 'bottom' is the first half
of the file containing the keys that sort lowest and 'top' is the second half
of the file with keys that sort greater than those of the bottom half.
The top includes the split files midkey, of the key that follows if it does
not exist in the file.
<p>This type works in tandem with the <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io"><code>Reference</code></a> type. This class
is used reading while Reference is used writing.
<p>This file is not splitable. Calls to <a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#midKey--"><code>midKey()</code></a> return null.</div>
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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="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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#firstKey">firstKey</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#firstKeySeeked">firstKeySeeked</a></span></code>&nbsp;</td>
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<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/io/HalfStoreFileReader.html#LOG">LOG</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#splitCell">splitCell</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>protected byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#splitkey">splitkey</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>(package private) boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#top">top</a></span></code>&nbsp;</td>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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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/io/HalfStoreFileReader.html#HalfStoreFileReader-org.apache.hadoop.hbase.io.hfile.ReaderContext-org.apache.hadoop.hbase.io.hfile.HFileInfo-org.apache.hadoop.hbase.io.hfile.CacheConfig-org.apache.hadoop.hbase.io.Reference-java.util.concurrent.atomic.AtomicInteger-org.apache.hadoop.conf.Configuration-">HalfStoreFileReader</a></span>(<a href="../../../../../org/apache/hadoop/hbase/io/hfile/ReaderContext.html" title="class in org.apache.hadoop.hbase.io.hfile">ReaderContext</a>&nbsp;context,
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<a href="../../../../../org/apache/hadoop/hbase/io/hfile/CacheConfig.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheConfig</a>&nbsp;cacheConf,
<a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a>&nbsp;r,
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org.apache.hadoop.conf.Configuration&nbsp;conf)</code>
<div class="block">Creates a half file reader for a hfile referred to by an hfilelink.</div>
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<h3>Method Summary</h3>
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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>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#getEntries--">getEntries</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#getFilterEntries--">getFilterEntries</a></span>()</code>
<div class="block">The number of Bloom filter entries in this store file, or an estimate
thereof, if the Bloom filter is not loaded.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#getFirstKey--">getFirstKey</a></span>()</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#getLastKey--">getLastKey</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/io/hfile/HFileScanner.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileScanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#getScanner-boolean-boolean-boolean-">getScanner</a></span>(boolean&nbsp;cacheBlocks,
boolean&nbsp;pread,
boolean&nbsp;isCompaction)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#isTop--">isTop</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#midKey--">midKey</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/HalfStoreFileReader.html#passesKeyRangeFilter-org.apache.hadoop.hbase.client.Scan-">passesKeyRangeFilter</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">Checks whether the given scan rowkey range overlaps with the current storefile's</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></h3>
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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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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.57">LOG</a></pre>
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<pre>final&nbsp;boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.58">top</a></pre>
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<h4>HalfStoreFileReader</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.78">HalfStoreFileReader</a>(<a href="../../../../../org/apache/hadoop/hbase/io/hfile/ReaderContext.html" title="class in org.apache.hadoop.hbase.io.hfile">ReaderContext</a>&nbsp;context,
<a href="../../../../../org/apache/hadoop/hbase/io/hfile/HFileInfo.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileInfo</a>&nbsp;fileInfo,
<a href="../../../../../org/apache/hadoop/hbase/io/hfile/CacheConfig.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheConfig</a>&nbsp;cacheConf,
<a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a>&nbsp;r,
<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>&nbsp;refCount,
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">Creates a half file reader for a hfile referred to by an hfilelink.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - Reader context info</dd>
<dd><code>fileInfo</code> - HFile info</dd>
<dd><code>cacheConf</code> - CacheConfig</dd>
<dd><code>r</code> - original reference file (contains top or bottom)</dd>
<dd><code>refCount</code> - reference count</dd>
<dd><code>conf</code> - Configuration</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>protected&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.93">isTop</a>()</pre>
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<h4>getScanner</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/hadoop/hbase/io/hfile/HFileScanner.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileScanner</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.98">getScanner</a>(boolean&nbsp;cacheBlocks,
boolean&nbsp;pread,
boolean&nbsp;isCompaction)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getScanner-boolean-boolean-boolean-">getScanner</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheBlocks</code> - should we cache the blocks?</dd>
<dd><code>pread</code> - use pread (for concurrent small readers)</dd>
<dd><code>isCompaction</code> - is scanner being used for compaction?</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the underlying HFileScanner</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="https://issues.apache.org/jira/browse/HBASE-15296">HBASE-15296</a></dd>
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<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.286">passesKeyRangeFilter</a>(<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#passesKeyRangeFilter-org.apache.hadoop.hbase.client.Scan-">StoreFileReader</a></code></span></div>
<div class="block">Checks whether the given scan rowkey range overlaps with the current storefile's</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#passesKeyRangeFilter-org.apache.hadoop.hbase.client.Scan-">passesKeyRangeFilter</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scan</code> - the scan specification. Used to determine the rowkey range.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if there is overlap, false otherwise</dd>
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<h4>getLastKey</h4>
<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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.291">getLastKey</a>()</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getLastKey--">getLastKey</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
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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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.312">midKey</a>()
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>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#midKey--">midKey</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></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&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/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.318">getFirstKey</a>()</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getFirstKey--">getFirstKey</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
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<pre>public&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.338">getEntries</a>()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getEntries--">getEntries</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
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<pre>public&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/HalfStoreFileReader.html#line.344">getFilterEntries</a>()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getFilterEntries--">StoreFileReader</a></code></span></div>
<div class="block">The number of Bloom filter entries in this store file, or an estimate
thereof, if the Bloom filter is not loaded. This always returns an upper
bound of the number of Bloom filter entries.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html#getFilterEntries--">getFilterEntries</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreFileReader.html" title="class in org.apache.hadoop.hbase.regionserver">StoreFileReader</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an estimate of the number of Bloom filter entries in this file</dd>
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