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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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| <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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| <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> |
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| <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> |
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| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.39">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> |
| </li> |
| </ul> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </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 </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> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.hadoop.hbase.regionserver.KeyValueHeap"> |
| <!-- --> |
| </a> |
| <h3>Nested classes/interfaces inherited from class 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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| </li> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <li class="blockList"><a name="fields.inherited.from.class.org.apache.hadoop.hbase.regionserver.KeyValueHeap"> |
| <!-- --> |
| </a> |
| <h3>Fields inherited from class 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 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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| <li class="blockList"><a name="constructor.summary"> |
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| </a> |
| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <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><? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>> scanners, |
| <a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a> comparator)</code> </td> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <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> 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> key, |
| boolean forward, |
| boolean 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> 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> 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> seekKey)</code> |
| <div class="block">Seek the scanner at the first Cell of the row which is the previous row |
| of specified key</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.hadoop.hbase.regionserver.KeyValueHeap"> |
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| </a> |
| <h3>Methods inherited from class 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#shipped--">shipped</a></code></li> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/NonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonLazyKeyValueScanner</a></h3> |
| <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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| <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 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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| <h3>Methods inherited from interface org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-">next</a></code></li> |
| </ul> |
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| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ReversedKeyValueHeap-java.util.List-org.apache.hadoop.hbase.CellComparator-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ReversedKeyValueHeap</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.46">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><? extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>> scanners, |
| <a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a> 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="paramLabel">Parameters:</span></dt> |
| <dd><code>scanners</code> - </dd> |
| <dd><code>comparator</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> |
| </dl> |
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| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="seek-org.apache.hadoop.hbase.Cell-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>seek</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.52">seek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> 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: <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> in interface <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> in class <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-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>reseek</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.58">reseek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> 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: <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> in interface <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> in class <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-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>requestSeek</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.64">requestSeek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> key, |
| boolean forward, |
| boolean 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: <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> in interface <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> in class <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-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>seekToPreviousRow</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.71">seekToPreviousRow</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> 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: <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> in interface <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> in class <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-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>backwardSeek</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.100">backwardSeek</a>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> 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: <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> in interface <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> in class <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> |
| </li> |
| </ul> |
| <a name="next--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>next</h4> |
| <pre>public <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.127">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: <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> in interface <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> in class <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> |
| </ul> |
| <a name="seekToLastRow--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>seekToLastRow</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.html#line.191">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: <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> in interface <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> in class <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> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
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| <li><a href="package-summary.html">Package</a></li> |
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| <li><a href="class-use/ReversedKeyValueHeap.html">Use</a></li> |
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