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<div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
<h2 title="Interface RegionScanner" class="title">Interface RegionScanner</h2>
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<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScannerImpl.html" title="class in org.apache.hadoop.hbase.regionserver">RegionScannerImpl</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/ReversedRegionScannerImpl.html" title="class in org.apache.hadoop.hbase.regionserver">ReversedRegionScannerImpl</a></dd>
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<pre>@InterfaceAudience.LimitedPrivate(value="Coprocesssor")
@InterfaceStability.Evolving
public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.35">RegionScanner</a>
extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></pre>
<div class="block">RegionScanner describes iterators over rows in an HRegion.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#getBatch--">getBatch</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#getMaxResultSize--">getMaxResultSize</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#getMvccReadPoint--">getMvccReadPoint</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#getRegionInfo--">getRegionInfo</a></span>()</code>&nbsp;</td>
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<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/RegionScanner.html#isFilterDone--">isFilterDone</a></span>()</code>&nbsp;</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/RegionScanner.html#nextRaw-java.util.List-">nextRaw</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;<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;result)</code>
<div class="block">Grab the next row's worth of values.</div>
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<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/RegionScanner.html#nextRaw-java.util.List-org.apache.hadoop.hbase.regionserver.ScannerContext-">nextRaw</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;<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;result,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext</a>&nbsp;scannerContext)</code>
<div class="block">Grab the next row's worth of values.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#reseek-byte:A-">reseek</a></span>(byte[]&nbsp;row)</code>
<div class="block">Do a reseek to the required row.</div>
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<h3>Methods inherited from interface&nbsp;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#close--">close</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-">next</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-org.apache.hadoop.hbase.regionserver.ScannerContext-">next</a></code></li>
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<h3>Method Detail</h3>
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<h4>getRegionInfo</h4>
<pre><a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.39">getRegionInfo</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The RegionInfo for this scanner.</dd>
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<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.45">isFilterDone</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>True if a filter indicates that this scanner will return no further rows.</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> - in case of I/O failure on a filter.</dd>
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<h4>reseek</h4>
<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.57">reseek</a>(byte[]&nbsp;row)
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">Do a reseek to the required row. Should not be used to seek to a key which
may come before the current position. Always seeks to the beginning of a
row boundary.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if row is null</dd>
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<h4>getMaxResultSize</h4>
<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.63">getMaxResultSize</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The preferred max buffersize. See
<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html#setMaxResultSize-long-"><code>Scan.setMaxResultSize(long)</code></a></dd>
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<pre>long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.68">getMvccReadPoint</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The Scanner's MVCC readPt see <a href="../../../../../org/apache/hadoop/hbase/regionserver/MultiVersionConcurrencyControl.html" title="class in org.apache.hadoop.hbase.regionserver"><code>MultiVersionConcurrencyControl</code></a></dd>
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<h4>getBatch</h4>
<pre>int&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.74">getBatch</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The limit on the number of cells to retrieve on each call to next(). See
<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html#setBatch-int-"><code>Scan.setBatch(int)</code></a></dd>
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<h4>nextRaw</h4>
<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.85">nextRaw</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;result)
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">Grab the next row's worth of values. This is a special internal method to be called from
coprocessor hooks to avoid expensive setup. Caller must set the thread's readpoint, start and
close a region operation, an synchronize on the scanner object. Caller should maintain and
update metrics. See <a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionScanner.html#nextRaw-java.util.List-org.apache.hadoop.hbase.regionserver.ScannerContext-"><code>nextRaw(List, ScannerContext)</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>result</code> - return output array</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if more rows exist after this one, false if scanner is done</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> - e</dd>
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<h4>nextRaw</h4>
<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/RegionScanner.html#line.116">nextRaw</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&gt;&nbsp;result,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext</a>&nbsp;scannerContext)
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">Grab the next row's worth of values. The <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a> is used to enforce and track
any limits associated with this call. Any progress that exists in the <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a>
prior to calling this method will be LOST if <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getKeepProgress--"><code>ScannerContext.getKeepProgress()</code></a> is false.
Upon returning from this method, the <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a> will contain information about the
progress made towards the limits. This is a special internal method to be called from
coprocessor hooks to avoid expensive setup. Caller must set the thread's readpoint, start and
close a region operation, an synchronize on the scanner object. Example: <code>
HRegion region = ...;
RegionScanner scanner = ...
MultiVersionConcurrencyControl.setThreadReadPoint(scanner.getMvccReadPoint());
region.startRegionOperation();
try {
synchronized(scanner) {
...
boolean moreRows = scanner.nextRaw(values);
...
}
} finally {
region.closeRegionOperation();
}
</code></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>result</code> - return output array</dd>
<dd><code>scannerContext</code> - The <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a> instance encapsulating all limits that should
be tracked during calls to this method. The progress towards these limits can be
tracked within this instance.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if more rows exist after this one, false if scanner is done</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> - e</dd>
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