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<title>ReversedStoreScanner (Apache HBase 4.0.0-alpha-1-SNAPSHOT API)</title>
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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.regionserver</a></div>
<h1 title="Class ReversedStoreScanner" class="title">Class ReversedStoreScanner</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"><a href="NonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner</a>
<div class="inheritance"><a href="NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner</a>
<div class="inheritance"><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.StoreScanner</a>
<div class="inheritance">org.apache.hadoop.hbase.regionserver.ReversedStoreScanner</div>
</div>
</div>
</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/Closeable.html" title="class or interface in java.io" class="external-link">Closeable</a></code>, <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html" title="class or interface in java.lang" class="external-link">AutoCloseable</a></code>, <code><a href="ChangedReadersObserver.html" title="interface in org.apache.hadoop.hbase.regionserver">ChangedReadersObserver</a></code>, <code><a href="InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></code>, <code><a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code>, <code><a href="Shipper.html" title="interface in org.apache.hadoop.hbase.regionserver">Shipper</a></code></dd>
</dl>
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="ReversedMobStoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">ReversedMobStoreScanner</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/regionserver/ReversedStoreScanner.html#line-34">ReversedStoreScanner</a></span>
<span class="extends-implements">extends <a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a>
implements <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></span></div>
<div class="block">ReversedStoreScanner extends from StoreScanner, and is used to support reversed scanning.</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="inherited-list">
<h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.regionserver.StoreScanner">Fields inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></h3>
<code><a href="StoreScanner.html#currentScanners">currentScanners</a>, <a href="StoreScanner.html#DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK">DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK</a>, <a href="StoreScanner.html#HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK">HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK</a>, <a href="StoreScanner.html#heap">heap</a>, <a href="StoreScanner.html#LAZY_SEEK_ENABLED_BY_DEFAULT">LAZY_SEEK_ENABLED_BY_DEFAULT</a>, <a href="StoreScanner.html#memstoreOnlyReads">memstoreOnlyReads</a>, <a href="StoreScanner.html#mixedReads">mixedReads</a>, <a href="StoreScanner.html#readPt">readPt</a>, <a href="StoreScanner.html#store">store</a>, <a href="StoreScanner.html#STORESCANNER_PARALLEL_SEEK_ENABLE">STORESCANNER_PARALLEL_SEEK_ENABLE</a>, <a href="StoreScanner.html#STORESCANNER_PREAD_MAX_BYTES">STORESCANNER_PREAD_MAX_BYTES</a></code></div>
<div class="inherited-list">
<h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.regionserver.KeyValueScanner">Fields inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></h3>
<code><a href="KeyValueScanner.html#NO_NEXT_INDEXED_KEY">NO_NEXT_INDEXED_KEY</a></code></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(org.apache.hadoop.hbase.client.Scan,org.apache.hadoop.hbase.regionserver.ScanInfo,java.util.NavigableSet,java.util.List)" class="member-name-link">ReversedStoreScanner</a><wbr>(<a href="../client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan,
<a href="ScanInfo.html" title="class in org.apache.hadoop.hbase.regionserver">ScanInfo</a>&nbsp;scanInfo,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableSet.html" title="class or interface in java.util" class="external-link">NavigableSet</a>&lt;byte[]&gt;&nbsp;columns,
<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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners)</code></div>
<div class="col-last even-row-color">
<div class="block">Constructor for testing.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(org.apache.hadoop.hbase.regionserver.HStore,org.apache.hadoop.hbase.regionserver.ScanInfo,org.apache.hadoop.hbase.client.Scan,java.util.NavigableSet,long)" class="member-name-link">ReversedStoreScanner</a><wbr>(<a href="HStore.html" title="class in org.apache.hadoop.hbase.regionserver">HStore</a>&nbsp;store,
<a href="ScanInfo.html" title="class in org.apache.hadoop.hbase.regionserver">ScanInfo</a>&nbsp;scanInfo,
<a href="../client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableSet.html" title="class or interface in java.util" class="external-link">NavigableSet</a>&lt;byte[]&gt;&nbsp;columns,
long&nbsp;readPt)</code></div>
<div class="col-last odd-row-color">
<div class="block">Opens a scanner across memstore, snapshot, and all StoreFiles.</div>
</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<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-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance 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>
<div id="method-summary-table.tabpanel" role="tabpanel">
<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<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-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#backwardSeek(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">backwardSeek</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<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>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#checkScanOrder(org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.CellComparator)" class="member-name-link">checkScanOrder</a><wbr>(<a href="../Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;prevKV,
<a href="../Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;kv,
<a href="../CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Check whether scan as expected order</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected <a href="KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#newKVHeap(java.util.List,org.apache.hadoop.hbase.CellComparator)" class="member-name-link">newKVHeap</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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#reseek(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">reseek</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Reseek the scanner at or after the specified KeyValue.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#seek(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">seek</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Seek the scanner at or after the specified KeyValue.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#seekAsDirection(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">seekAsDirection</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Do a backwardSeek in a reversed StoreScanner(scan backward)</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#seekScanners(java.util.List,org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)" class="member-name-link">seekScanners</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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;seekKey,
boolean&nbsp;isLazy,
boolean&nbsp;isParallelSeek)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Seek the specified scanners with the given key</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#seekToNextRow(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">seekToNextRow</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#seekToPreviousRow(org.apache.hadoop.hbase.ExtendedCell)" class="member-name-link">seekToPreviousRow</a><wbr>(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Seek the scanner at the first Cell of the row which is the previous row of specified key</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.StoreScanner">Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></h3>
<code><a href="StoreScanner.html#checkFlushed()">checkFlushed</a>, <a href="StoreScanner.html#close()">close</a>, <a href="StoreScanner.html#enableLazySeekGlobally(boolean)">enableLazySeekGlobally</a>, <a href="StoreScanner.html#getAllScannersForTesting()">getAllScannersForTesting</a>, <a href="StoreScanner.html#getEstimatedNumberOfKvsScanned()">getEstimatedNumberOfKvsScanned</a>, <a href="StoreScanner.html#getNextIndexedKey()">getNextIndexedKey</a>, <a href="StoreScanner.html#getReadPoint()">getReadPoint</a>, <a href="StoreScanner.html#isScanUsePread()">isScanUsePread</a>, <a href="StoreScanner.html#next()">next</a>, <a href="StoreScanner.html#next(java.util.List,org.apache.hadoop.hbase.regionserver.ScannerContext)">next</a>, <a href="StoreScanner.html#peek()">peek</a>, <a href="StoreScanner.html#reopenAfterFlush()">reopenAfterFlush</a>, <a href="StoreScanner.html#resetKVHeap(java.util.List,org.apache.hadoop.hbase.CellComparator)">resetKVHeap</a>, <a href="StoreScanner.html#selectScannersFrom(org.apache.hadoop.hbase.regionserver.HStore,java.util.List)">selectScannersFrom</a>, <a href="StoreScanner.html#shipped()">shipped</a>, <a href="StoreScanner.html#trySkipToNextColumn(org.apache.hadoop.hbase.ExtendedCell)">trySkipToNextColumn</a>, <a href="StoreScanner.html#trySkipToNextRow(org.apache.hadoop.hbase.ExtendedCell)">trySkipToNextRow</a>, <a href="StoreScanner.html#trySwitchToStreamRead()">trySwitchToStreamRead</a>, <a href="StoreScanner.html#updateReaders(java.util.List,java.util.List)">updateReaders</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner">Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></h3>
<code><a href="NonReversedNonLazyKeyValueScanner.html#seekToLastRow()">seekToLastRow</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner">Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="NonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonLazyKeyValueScanner</a></h3>
<code><a href="NonLazyKeyValueScanner.html#doRealSeek(org.apache.hadoop.hbase.regionserver.KeyValueScanner,org.apache.hadoop.hbase.ExtendedCell,boolean)">doRealSeek</a>, <a href="NonLazyKeyValueScanner.html#enforceSeek()">enforceSeek</a>, <a href="NonLazyKeyValueScanner.html#getFilePath()">getFilePath</a>, <a href="NonLazyKeyValueScanner.html#isFileScanner()">isFileScanner</a>, <a href="NonLazyKeyValueScanner.html#realSeekDone()">realSeekDone</a>, <a href="NonLazyKeyValueScanner.html#recordBlockSize(java.util.function.IntConsumer)">recordBlockSize</a>, <a href="NonLazyKeyValueScanner.html#requestSeek(org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)">requestSeek</a>, <a href="NonLazyKeyValueScanner.html#shouldUseScanner(org.apache.hadoop.hbase.client.Scan,org.apache.hadoop.hbase.regionserver.HStore,long)">shouldUseScanner</a></code></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>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.InternalScanner">Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></h3>
<code><a href="InternalScanner.html#next(java.util.List)">next</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.KeyValueScanner">Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></h3>
<code><a href="KeyValueScanner.html#close()">close</a>, <a href="KeyValueScanner.html#enforceSeek()">enforceSeek</a>, <a href="KeyValueScanner.html#getFilePath()">getFilePath</a>, <a href="KeyValueScanner.html#getNextIndexedKey()">getNextIndexedKey</a>, <a href="KeyValueScanner.html#getScannerOrder()">getScannerOrder</a>, <a href="KeyValueScanner.html#isFileScanner()">isFileScanner</a>, <a href="KeyValueScanner.html#next()">next</a>, <a href="KeyValueScanner.html#peek()">peek</a>, <a href="KeyValueScanner.html#realSeekDone()">realSeekDone</a>, <a href="KeyValueScanner.html#recordBlockSize(java.util.function.IntConsumer)">recordBlockSize</a>, <a href="KeyValueScanner.html#requestSeek(org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)">requestSeek</a>, <a href="KeyValueScanner.html#seekToLastRow()">seekToLastRow</a>, <a href="KeyValueScanner.html#shouldUseScanner(org.apache.hadoop.hbase.client.Scan,org.apache.hadoop.hbase.regionserver.HStore,long)">shouldUseScanner</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.regionserver.Shipper">Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="Shipper.html" title="interface in org.apache.hadoop.hbase.regionserver">Shipper</a></h3>
<code><a href="Shipper.html#shipped()">shipped</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= 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;(org.apache.hadoop.hbase.regionserver.HStore,org.apache.hadoop.hbase.regionserver.ScanInfo,org.apache.hadoop.hbase.client.Scan,java.util.NavigableSet,long)">
<h3>ReversedStoreScanner</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-44">ReversedStoreScanner</a></span><wbr><span class="parameters">(<a href="HStore.html" title="class in org.apache.hadoop.hbase.regionserver">HStore</a>&nbsp;store,
<a href="ScanInfo.html" title="class in org.apache.hadoop.hbase.regionserver">ScanInfo</a>&nbsp;scanInfo,
<a href="../client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableSet.html" title="class or interface in java.util" class="external-link">NavigableSet</a>&lt;byte[]&gt;&nbsp;columns,
long&nbsp;readPt)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Opens a scanner across memstore, snapshot, and all StoreFiles. Assumes we are not in a
compaction.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>store</code> - who we scan</dd>
<dd><code>scan</code> - the spec</dd>
<dd><code>columns</code> - which columns we are scanning</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(org.apache.hadoop.hbase.client.Scan,org.apache.hadoop.hbase.regionserver.ScanInfo,java.util.NavigableSet,java.util.List)">
<h3>ReversedStoreScanner</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-50">ReversedStoreScanner</a></span><wbr><span class="parameters">(<a href="../client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan,
<a href="ScanInfo.html" title="class in org.apache.hadoop.hbase.regionserver">ScanInfo</a>&nbsp;scanInfo,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/NavigableSet.html" title="class or interface in java.util" class="external-link">NavigableSet</a>&lt;byte[]&gt;&nbsp;columns,
<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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Constructor for testing.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</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="newKVHeap(java.util.List,org.apache.hadoop.hbase.CellComparator)">
<h3>newKVHeap</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type"><a href="KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-55">newKVHeap</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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#newKVHeap(java.util.List,org.apache.hadoop.hbase.CellComparator)">newKVHeap</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="seekScanners(java.util.List,org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)">
<h3>seekScanners</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-61">seekScanners</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;? extends <a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;scanners,
<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;seekKey,
boolean&nbsp;isLazy,
boolean&nbsp;isParallelSeek)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="StoreScanner.html#seekScanners(java.util.List,org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)">StoreScanner</a></code></span></div>
<div class="block">Seek the specified scanners with the given key</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#seekScanners(java.util.List,org.apache.hadoop.hbase.ExtendedCell,boolean,boolean)">seekScanners</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dd><code>isLazy</code> - true if using lazy seek</dd>
<dd><code>isParallelSeek</code> - true if using parallel seek</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="seekToNextRow(org.apache.hadoop.hbase.ExtendedCell)">
<h3>seekToNextRow</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-77">seekToNextRow</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#seekToNextRow(org.apache.hadoop.hbase.ExtendedCell)">seekToNextRow</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="seekAsDirection(org.apache.hadoop.hbase.ExtendedCell)">
<h3>seekAsDirection</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-85">seekAsDirection</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Do a backwardSeek in a reversed StoreScanner(scan backward)</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#seekAsDirection(org.apache.hadoop.hbase.ExtendedCell)">seekAsDirection</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Returns:</dt>
<dd>true if scanner has values left, false if end of scanner</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="checkScanOrder(org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.CellComparator)">
<h3>checkScanOrder</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-90">checkScanOrder</a></span><wbr><span class="parameters">(<a href="../Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;prevKV,
<a href="../Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;kv,
<a href="../CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;comparator)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="StoreScanner.html#checkScanOrder(org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.CellComparator)">StoreScanner</a></code></span></div>
<div class="block">Check whether scan as expected order</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#checkScanOrder(org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.Cell,org.apache.hadoop.hbase.CellComparator)">checkScanOrder</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="reseek(org.apache.hadoop.hbase.ExtendedCell)">
<h3>reseek</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-101">reseek</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;kv)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="KeyValueScanner.html#reseek(org.apache.hadoop.hbase.ExtendedCell)">KeyValueScanner</a></code></span></div>
<div class="block">Reseek the scanner at or after the specified KeyValue. This method is guaranteed to seek at or
after the required key only if the key comes after the current position of the scanner. Should
not be used to seek to a key which may come before the current position.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="KeyValueScanner.html#reseek(org.apache.hadoop.hbase.ExtendedCell)">reseek</a></code>&nbsp;in interface&nbsp;<code><a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#reseek(org.apache.hadoop.hbase.ExtendedCell)">reseek</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Parameters:</dt>
<dd><code>kv</code> - seek value (should be non-null)</dd>
<dt>Returns:</dt>
<dd>true if scanner has values left, false if end of scanner</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="seek(org.apache.hadoop.hbase.ExtendedCell)">
<h3>seek</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-106">seek</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="KeyValueScanner.html#seek(org.apache.hadoop.hbase.ExtendedCell)">KeyValueScanner</a></code></span></div>
<div class="block">Seek the scanner at or after the specified KeyValue.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="KeyValueScanner.html#seek(org.apache.hadoop.hbase.ExtendedCell)">seek</a></code>&nbsp;in interface&nbsp;<code><a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt>Overrides:</dt>
<dd><code><a href="StoreScanner.html#seek(org.apache.hadoop.hbase.ExtendedCell)">seek</a></code>&nbsp;in class&nbsp;<code><a href="StoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">StoreScanner</a></code></dd>
<dt>Parameters:</dt>
<dd><code>key</code> - seek value</dd>
<dt>Returns:</dt>
<dd>true if scanner has values left, false if end of scanner</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="seekToPreviousRow(org.apache.hadoop.hbase.ExtendedCell)">
<h3>seekToPreviousRow</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-111">seekToPreviousRow</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="KeyValueScanner.html#seekToPreviousRow(org.apache.hadoop.hbase.ExtendedCell)">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 class="notes">
<dt>Specified by:</dt>
<dd><code><a href="KeyValueScanner.html#seekToPreviousRow(org.apache.hadoop.hbase.ExtendedCell)">seekToPreviousRow</a></code>&nbsp;in interface&nbsp;<code><a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt>Overrides:</dt>
<dd><code><a href="NonReversedNonLazyKeyValueScanner.html#seekToPreviousRow(org.apache.hadoop.hbase.ExtendedCell)">seekToPreviousRow</a></code>&nbsp;in class&nbsp;<code><a href="NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></code></dd>
<dt>Parameters:</dt>
<dd><code>key</code> - seek value</dd>
<dt>Returns:</dt>
<dd>true if the scanner at the first valid Cell of previous row, false if not existing such
Cell</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="backwardSeek(org.apache.hadoop.hbase.ExtendedCell)">
<h3>backwardSeek</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html#line-119">backwardSeek</a></span><wbr><span class="parameters">(<a href="../ExtendedCell.html" title="interface in org.apache.hadoop.hbase">ExtendedCell</a>&nbsp;key)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="KeyValueScanner.html#backwardSeek(org.apache.hadoop.hbase.ExtendedCell)">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 class="notes">
<dt>Specified by:</dt>
<dd><code><a href="KeyValueScanner.html#backwardSeek(org.apache.hadoop.hbase.ExtendedCell)">backwardSeek</a></code>&nbsp;in interface&nbsp;<code><a href="KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a></code></dd>
<dt>Overrides:</dt>
<dd><code><a href="NonReversedNonLazyKeyValueScanner.html#backwardSeek(org.apache.hadoop.hbase.ExtendedCell)">backwardSeek</a></code>&nbsp;in class&nbsp;<code><a href="NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a></code></dd>
<dt>Parameters:</dt>
<dd><code>key</code> - seek KeyValue</dd>
<dt>Returns:</dt>
<dd>true if the scanner is at the valid KeyValue, false if such KeyValue does not exist</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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