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<div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
<h2 title="Class ReversedKeyValueHeap" class="title">Class ReversedKeyValueHeap</h2>
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<div class="contentContainer">
<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>
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<li><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner</a></li>
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<ul class="inheritance">
<li><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.KeyValueHeap</a></li>
<li>
<ul class="inheritance">
<li>org.apache.hadoop.hbase.regionserver.ReversedKeyValueHeap</li>
</ul>
</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/Shipper.html" title="interface in org.apache.hadoop.hbase.regionserver">Shipper</a></dd>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.36">ReversedKeyValueHeap</a>
extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></pre>
<div class="block">ReversedKeyValueHeap is used for supporting reversed scanning. Compared with KeyValueHeap, its
scanner comparator is a little different (see ReversedKVScannerComparator), all seek is backward
seek(see <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#backwardSeek-org.apache.hadoop.hbase.Cell-"><code>KeyValueScanner.backwardSeek(org.apache.hadoop.hbase.Cell)</code></a>), and it will jump to the previous row if it is
already at the end of one row when calling next().</div>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.ReversedKVScannerComparator.html" title="class in org.apache.hadoop.hbase.regionserver">ReversedKeyValueHeap.ReversedKVScannerComparator</a></span></code>
<div class="block">In ReversedKVScannerComparator, we compare the row of scanners' peek values first, sort bigger
one before the smaller one.</div>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.KVScannerComparator.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap.KVScannerComparator</a></code></li>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#comparator">comparator</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#current">current</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#heap">heap</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#scannersForDelayedClose">scannersForDelayedClose</a></code></li>
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<h3>Fields inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#NO_NEXT_INDEXED_KEY">NO_NEXT_INDEXED_KEY</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<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/regionserver/ReversedKeyValueHeap.html#ReversedKeyValueHeap-java.util.List-org.apache.hadoop.hbase.CellComparator-">ReversedKeyValueHeap</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)</code>&nbsp;</td>
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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>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#backwardSeek-org.apache.hadoop.hbase.Cell-">backwardSeek</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)</code>
<div class="block">Seek the scanner at or before the row of specified Cell, it firstly tries to seek the scanner
at or after the specified Cell, return if peek KeyValue of scanner has the same row with
specified Cell, otherwise seek the scanner at the first Cell of the row which is the previous
row of specified KeyValue</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><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/regionserver/ReversedKeyValueHeap.html#next--">next</a></span>()</code>
<div class="block">Return the next Cell in this scanner, iterating the scanner</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-">requestSeek</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;key,
boolean&nbsp;forward,
boolean&nbsp;useBloom)</code>
<div class="block">Similar to <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seek-org.apache.hadoop.hbase.Cell-"><code>KeyValueScanner.seek(org.apache.hadoop.hbase.Cell)</code></a> (or <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#reseek-org.apache.hadoop.hbase.Cell-"><code>KeyValueScanner.reseek(org.apache.hadoop.hbase.Cell)</code></a> if forward is true) but only does a seek operation
after checking that it is really necessary for the row/column combination specified by the kv
parameter.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#reseek-org.apache.hadoop.hbase.Cell-">reseek</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)</code>
<div class="block">This function is identical to the <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#seek-org.apache.hadoop.hbase.Cell-"><code>KeyValueHeap.seek(Cell)</code></a> function except that
scanner.seek(seekKey) is changed to scanner.reseek(seekKey).</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#seek-org.apache.hadoop.hbase.Cell-">seek</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)</code>
<div class="block">Seeks all scanners at or below the specified seek key.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#seekToLastRow--">seekToLastRow</a></span>()</code>
<div class="block">Seek the scanner at the first KeyValue of last row</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#seekToPreviousRow-org.apache.hadoop.hbase.Cell-">seekToPreviousRow</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)</code>
<div class="block">Seek the scanner at the first Cell of the row which is the previous row of specified key</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#close--">close</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#getCurrentForTesting--">getCurrentForTesting</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#getHeap--">getHeap</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#getNextIndexedKey--">getNextIndexedKey</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#isLatestCellFromMemstore--">isLatestCellFromMemstore</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#next-java.util.List-org.apache.hadoop.hbase.regionserver.ScannerContext-">next</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#peek--">peek</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#pollRealKV--">pollRealKV</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#recordBlockSize-java.util.function.IntConsumer-">recordBlockSize</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#shipped--">shipped</a></code></li>
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<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#doRealSeek-org.apache.hadoop.hbase.regionserver.KeyValueScanner-org.apache.hadoop.hbase.Cell-boolean-">doRealSeek</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#enforceSeek--">enforceSeek</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#getFilePath--">getFilePath</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#isFileScanner--">isFileScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#realSeekDone--">realSeekDone</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html#shouldUseScanner-org.apache.hadoop.hbase.client.Scan-org.apache.hadoop.hbase.regionserver.HStore-long-">shouldUseScanner</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<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></h3>
<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>Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#enforceSeek--">enforceSeek</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#getFilePath--">getFilePath</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#getScannerOrder--">getScannerOrder</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#isFileScanner--">isFileScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#realSeekDone--">realSeekDone</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#shouldUseScanner-org.apache.hadoop.hbase.client.Scan-org.apache.hadoop.hbase.regionserver.HStore-long-">shouldUseScanner</a></code></li>
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<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-">next</a></code></li>
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<h4>ReversedKeyValueHeap</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.40">ReversedKeyValueHeap</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)
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="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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<h3>Method Detail</h3>
<a name="seek-org.apache.hadoop.hbase.Cell-">
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<ul class="blockList">
<li class="blockList">
<h4>seek</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.46">seek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)
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"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#seek-org.apache.hadoop.hbase.Cell-">KeyValueHeap</a></code></span></div>
<div class="block">Seeks all scanners at or below the specified seek key. If we earlied-out of a row, we may end
up skipping values that were never reached yet. Rather than iterating down, we want to give the
opportunity to re-seek.
<p>
As individual scanners may run past their ends, those scanners are automatically closed and
removed from the heap.
<p>
This function (and <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#reseek-org.apache.hadoop.hbase.Cell-"><code>KeyValueHeap.reseek(Cell)</code></a>) does not do multi-column Bloom filter and lazy-seek
optimizations. To enable those, call <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-"><code>KeyValueHeap.requestSeek(Cell, boolean, boolean)</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seek-org.apache.hadoop.hbase.Cell-">seek</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#seek-org.apache.hadoop.hbase.Cell-">seek</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>seekKey</code> - KeyValue to seek at or after</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if KeyValues exist at or after specified key, false if not</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>
</dl>
</li>
</ul>
<a name="reseek-org.apache.hadoop.hbase.Cell-">
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<h4>reseek</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.51">reseek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)
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"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#reseek-org.apache.hadoop.hbase.Cell-">KeyValueHeap</a></code></span></div>
<div class="block">This function is identical to the <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#seek-org.apache.hadoop.hbase.Cell-"><code>KeyValueHeap.seek(Cell)</code></a> function except that
scanner.seek(seekKey) is changed to scanner.reseek(seekKey).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#reseek-org.apache.hadoop.hbase.Cell-">reseek</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#reseek-org.apache.hadoop.hbase.Cell-">reseek</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>seekKey</code> - seek value (should be non-null)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if scanner has values left, false if end of scanner</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>
</dl>
</li>
</ul>
<a name="requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-">
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<ul class="blockList">
<li class="blockList">
<h4>requestSeek</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.56">requestSeek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;key,
boolean&nbsp;forward,
boolean&nbsp;useBloom)
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"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-">KeyValueHeap</a></code></span></div>
<div class="block">Similar to <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seek-org.apache.hadoop.hbase.Cell-"><code>KeyValueScanner.seek(org.apache.hadoop.hbase.Cell)</code></a> (or <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#reseek-org.apache.hadoop.hbase.Cell-"><code>KeyValueScanner.reseek(org.apache.hadoop.hbase.Cell)</code></a> if forward is true) but only does a seek operation
after checking that it is really necessary for the row/column combination specified by the kv
parameter. This function was added to avoid unnecessary disk seeks by checking row-column Bloom
filters before a seek on multi-column get/scan queries, and to optimize by looking up more
recent files first.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-">requestSeek</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#requestSeek-org.apache.hadoop.hbase.Cell-boolean-boolean-">requestSeek</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></dd>
<dd><code>forward</code> - do a forward-only "reseek" instead of a random-access seek</dd>
<dd><code>useBloom</code> - whether to enable multi-column Bloom filter optimization</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>
</dl>
</li>
</ul>
<a name="seekToPreviousRow-org.apache.hadoop.hbase.Cell-">
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<ul class="blockList">
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<h4>seekToPreviousRow</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.61">seekToPreviousRow</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seekToPreviousRow-org.apache.hadoop.hbase.Cell-">KeyValueScanner</a></code></span></div>
<div class="block">Seek the scanner at the first Cell of the row which is the previous row of specified key</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seekToPreviousRow-org.apache.hadoop.hbase.Cell-">seekToPreviousRow</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html#seekToPreviousRow-org.apache.hadoop.hbase.Cell-">seekToPreviousRow</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>seekKey</code> - seek value</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the scanner at the first valid Cell of previous row, false if not existing such
Cell</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>
</dl>
</li>
</ul>
<a name="backwardSeek-org.apache.hadoop.hbase.Cell-">
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<ul class="blockList">
<li class="blockList">
<h4>backwardSeek</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.90">backwardSeek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;seekKey)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#backwardSeek-org.apache.hadoop.hbase.Cell-">KeyValueScanner</a></code></span></div>
<div class="block">Seek the scanner at or before the row of specified Cell, it firstly tries to seek the scanner
at or after the specified Cell, return if peek KeyValue of scanner has the same row with
specified Cell, otherwise seek the scanner at the first Cell of the row which is the previous
row of specified KeyValue</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#backwardSeek-org.apache.hadoop.hbase.Cell-">backwardSeek</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html#backwardSeek-org.apache.hadoop.hbase.Cell-">backwardSeek</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>seekKey</code> - seek KeyValue</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the scanner is at the valid KeyValue, false if such KeyValue does not exist</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>
</dl>
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<h4>next</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.119">next</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>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#next--">KeyValueScanner</a></code></span></div>
<div class="block">Return the next Cell in this scanner, iterating the scanner</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#next--">next</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html#next--">next</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the next Cell</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>
</dl>
</li>
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<a name="seekToLastRow--">
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<ul class="blockListLast">
<li class="blockList">
<h4>seekToLastRow</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.177">seekToLastRow</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>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seekToLastRow--">KeyValueScanner</a></code></span></div>
<div class="block">Seek the scanner at the first KeyValue of last row</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#seekToLastRow--">seekToLastRow</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html#seekToLastRow--">seekToLastRow</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if scanner has values left, false if the underlying data is empty</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>
</dl>
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