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 <div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
 <h2 title="Class StoreScanner" class="title">Class StoreScanner</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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 <dt>All Implemented Interfaces:</dt>
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 <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/MobStoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">MobStoreScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedStoreScanner.html" title="class in org.apache.hadoop.hbase.regionserver">ReversedStoreScanner</a></dd>
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 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/StoreScanner.html#line.64">StoreScanner</a>
 extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.html" title="class in org.apache.hadoop.hbase.regionserver">NonReversedNonLazyKeyValueScanner</a>
 implements <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/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/ChangedReadersObserver.html" title="interface in org.apache.hadoop.hbase.regionserver">ChangedReadersObserver</a></pre>
 <div class="block">Scanner scans both the memstore and the Store. Coalesce KeyValue stream into List&lt;KeyValue&gt;
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  <p>
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 <th class="colFirst" scope="col">Modifier and Type</th>
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 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#bytesRead">bytesRead</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html?is-external=true" title="class or interface in java.util.concurrent.locks">ReentrantLock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#closeLock">closeLock</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <td class="colFirst"><code>private long</code></td>
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 <td class="colFirst"><code>(package private) <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;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;</code></td>
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 <td class="colFirst"><code>static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK">DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK</a></span></code>
 <div class="block">Default value of <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK"><code>HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK</code></a>.</div>
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 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/executor/ExecutorService.html" title="class in org.apache.hadoop.hbase.executor">ExecutorService</a></code></td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <tr class="altColor">
 <td class="colFirst"><code>private <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;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;</code></td>
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 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html?is-external=true" title="class or interface in java.util.concurrent.locks">ReentrantLock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#flushLock">flushLock</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#get">get</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK">HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK</a></span></code>
 <div class="block">The number of cells scanned in between timeout checks.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueHeap.html" title="class in org.apache.hadoop.hbase.regionserver">KeyValueHeap</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#heap">heap</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#kvsScanned">kvsScanned</a></span></code>
 <div class="block">The number of KVs seen by the scanner.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#LAZY_SEEK_ENABLED_BY_DEFAULT">LAZY_SEEK_ENABLED_BY_DEFAULT</a></span></code>
 <div class="block">We don't ever expect to change this, the constant is just for clarity.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#lazySeekEnabledGlobally">lazySeekEnabledGlobally</a></span></code>
 <div class="block">Used during unit testing to ensure that lazy seek does save seek ops</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static org.slf4j.Logger</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#LOG">LOG</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#matcher">matcher</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#maxRowSize">maxRowSize</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#memstoreOnlyReads">memstoreOnlyReads</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>private <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;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;</code></td>
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 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#minVersions">minVersions</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#mixedReads">mixedReads</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
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 <tr class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#oldestUnexpiredTS">oldestUnexpiredTS</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#parallelSeekEnabled">parallelSeekEnabled</a></span></code>
 <div class="block">A flag that enables StoreFileScanner parallel-seeking</div>
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 <tr class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#preadMaxBytes">preadMaxBytes</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td>
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 <td class="colFirst"><code>protected long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#readPt">readPt</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/client/Scan.ReadType.html" title="enum in org.apache.hadoop.hbase.client">Scan.ReadType</a></code></td>
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 <tr class="altColor">
 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a></code></td>
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 <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#SCAN_FOR_COMPACTION">SCAN_FOR_COMPACTION</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>private <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;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;</code></td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStore.html" title="class in org.apache.hadoop.hbase.regionserver">HStore</a></code></td>
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 <td class="colFirst"><code>private int</code></td>
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 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#storeOffset">storeOffset</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#STORESCANNER_PARALLEL_SEEK_ENABLE">STORESCANNER_PARALLEL_SEEK_ENABLE</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <div class="block">If the read type is Scan.ReadType.DEFAULT, we will start with pread, and if the kvs we scanned
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 </td>
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 <tr>
 <th class="colFirst" scope="col">Modifier</th>
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 <td class="colFirst"><code>&nbsp;</code></td>
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 <td class="colFirst"><code>private </code></td>
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 <td class="colFirst"><code>(package private)</code></td>
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 <td class="colFirst"><code>(package private)</code></td>
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 <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>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#addCurrentScanners-java.util.List-">addCurrentScanners</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)</code>&nbsp;</td>
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 <td class="colFirst"><code>protected boolean</code></td>
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 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#checkScanOrder-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.CellComparator-">checkScanOrder</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;prevKV,
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 <td class="colFirst"><code>void</code></td>
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 <td class="colFirst"><code>private void</code></td>
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 <td class="colFirst"><code>(package private) static void</code></td>
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 <tr id="i8" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#getEstimatedNumberOfKvsScanned--">getEstimatedNumberOfKvsScanned</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>boolean</code></td>
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 <tr id="i16" class="altColor">
 <td class="colFirst"><code>private void</code></td>
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 <tr id="i18" class="altColor">
 <td class="colFirst"><code>protected boolean</code></td>
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 <td class="colFirst"><code>boolean</code></td>
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 <div class="block">See if we should actually SEEK or rather just SKIP to the next Cell (see HBASE-13109).
  ScanQueryMatcher may issue SEEK hints, such as seek to next column, next row,
  or seek to an arbitrary seek key. This method decides whether a seek is the most efficient
  _actual_ way to get us to the requested cell (SEEKs are more expensive than SKIP, SKIP,
  SKIP inside the current, loaded block).
  It does this by looking at the next indexed key of the current HFile. This key
  is then compared with the _SEEK_ key, where a SEEK key is an artificial 'last possible key
  on the row' (only in here, we avoid actually creating a SEEK key; in the compare we work with
  the current Cell but compare as though it were a seek key; see down in
  matcher.compareKeyForNextRow, etc). If the compare gets us onto the
  next block we *_SEEK, otherwise we just SKIP to the next requested cell.

  <p>Other notes:
  <ul>
  <li>Rows can straddle block boundaries</li>
  <li>Versions of columns can straddle block boundaries (i.e. column C1 at T1 might be in a
  different block than column C1 at T2)</li>
  <li>We want to SKIP if the chance is high that we'll find the desired Cell after a
  few SKIPs...</li>
  <li>We want to SEEK when the chance is high that we'll be able to seek
  past many Cells, especially if we know we need to go to the next block.</li>
  </ul>
  <p>A good proxy (best effort) to determine whether SKIP is better than SEEK is whether
  we'll likely end up seeking to the next block (or past the next block) to get our next column.
  Example:
  <pre>
  |    BLOCK 1              |     BLOCK 2                   |
  |  r1/c1, r1/c2, r1/c3    |    r1/c4, r1/c5, r2/c1        |
                                    ^         ^
                                    |         |
                            Next Index Key   SEEK_NEXT_ROW (before r2/c1)


  |    BLOCK 1                       |     BLOCK 2                      |
  |  r1/c1/t5, r1/c1/t4, r1/c1/t3    |    r1/c1/t2, r1/c1/T1, r1/c2/T3  |
                                             ^              ^
                                             |              |
                                     Next Index Key        SEEK_NEXT_COL
  </pre>
  Now imagine we want columns c1 and c3 (see first diagram above), the 'Next Index Key' of r1/c4
  is > r1/c3 so we should seek to get to the c1 on the next row, r2. In second case, say we only
  want one version of c1, after we have it, a SEEK_COL will be issued to get to c2. Looking at
  the 'Next Index Key', it would land us in the next block, so we should SEEK. In other scenarios
  where the SEEK will not land us in the next block, it is very likely better to issues a series
  of SKIPs.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - current cell</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true means skip to next row, false means 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>
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 <div class="block">See <a href="../../../../../org/apache/hadoop/hbase/regionserver/StoreScanner.html#trySkipToNextRow-org.apache.hadoop.hbase.Cell-"><code>trySkipToNextRow(Cell)</code></a></div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - current cell</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true means skip to next column, false means 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>
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 <dd><code>sfs</code> - The new files</dd>
 <dd><code>memStoreScanners</code> - scanner of current memstore</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
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 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>if top of heap has changed (and KeyValueHeap has to try the next KV)</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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                        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">Check whether scan as expected order</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>prevKV</code> - </dd>
 <dd><code>kv</code> - </dd>
 <dd><code>comparator</code> - </dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
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 <dl>
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 <div class="block">Do a reseek in a normal StoreScanner(scan forward)</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>kv</code> - </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>
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 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html#reseek-org.apache.hadoop.hbase.Cell-">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>
 <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="paramLabel">Parameters:</span></dt>
 <dd><code>kv</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>
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 <div class="block">Seek storefiles in parallel to optimize IO latency as much as possible</div>
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 <dt><span class="throwsLabel">Throws:</span></dt>
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 <div class="block">Used in testing.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
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 <dd>The estimated number of KVs seen by this scanner (includes some skipped KVs).</dd>
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 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the next key in the index, usually the first key of next block OR a key that falls
  between last key of current block and first key of next block..
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