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<div class="subTitle">org.apache.hadoop.io.file.tfile</div>
<h2 title="Class TFile.Reader" class="title">Class TFile.Reader</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.hadoop.io.file.tfile.TFile.Reader</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></dd>
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<dt>Enclosing class:</dt>
<dd><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.html" title="class in org.apache.hadoop.io.file.tfile">TFile</a></dd>
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<br>
<pre>@InterfaceStability.Evolving
public static class <span class="typeNameLabel">TFile.Reader</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">TFile Reader. Users may only read TFiles by creating TFile.Reader.Scanner.
objects. A scanner may scan the whole TFile (<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner--"><code>createScanner()</code></a>
) , a portion of TFile based on byte offsets (
<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByByteRange-long-long-"><code>createScannerByByteRange(long, long)</code></a>), or a portion of TFile with keys
fall in a certain key range (for sorted TFile only,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-byte:A-byte:A-"><code>createScannerByKey(byte[], byte[])</code></a> or
<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-org.apache.hadoop.io.file.tfile.RawComparable-org.apache.hadoop.io.file.tfile.RawComparable-"><code>createScannerByKey(RawComparable, RawComparable)</code></a>).</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></span></code>
<div class="block">The TFile Scanner.</div>
</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#Reader-org.apache.hadoop.fs.FSDataInputStream-long-org.apache.hadoop.conf.Configuration-">Reader</a></span>(<a href="../../../../../../org/apache/hadoop/fs/FSDataInputStream.html" title="class in org.apache.hadoop.fs">FSDataInputStream</a>&nbsp;fsdis,
long&nbsp;fileLength,
<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>
<div class="block">Constructor</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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#close--">close</a></span>()</code>
<div class="block">Close the reader.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner--">createScanner</a></span>()</code>
<div class="block">Get a scanner than can scan the whole TFile.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner-byte:A-byte:A-">createScanner</a></span>(byte[]&nbsp;beginKey,
byte[]&nbsp;endKey)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-byte:A-byte:A-"><code>createScannerByKey(byte[], byte[])</code></a> instead.</span></div>
</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScanner-org.apache.hadoop.io.file.tfile.RawComparable-org.apache.hadoop.io.file.tfile.RawComparable-">createScanner</a></span>(<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;beginKey,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;endKey)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-org.apache.hadoop.io.file.tfile.RawComparable-org.apache.hadoop.io.file.tfile.RawComparable-"><code>createScannerByKey(RawComparable, RawComparable)</code></a>
instead.</span></div>
</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByByteRange-long-long-">createScannerByByteRange</a></span>(long&nbsp;offset,
long&nbsp;length)</code>
<div class="block">Get a scanner that covers a portion of TFile based on byte offsets.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-byte:A-byte:A-">createScannerByKey</a></span>(byte[]&nbsp;beginKey,
byte[]&nbsp;endKey)</code>
<div class="block">Get a scanner that covers a portion of TFile based on keys.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-org.apache.hadoop.io.file.tfile.RawComparable-org.apache.hadoop.io.file.tfile.RawComparable-">createScannerByKey</a></span>(<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;beginKey,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;endKey)</code>
<div class="block">Get a scanner that covers a specific key range.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByRecordNum-long-long-">createScannerByRecordNum</a></span>(long&nbsp;beginRecNum,
long&nbsp;endRecNum)</code>
<div class="block">Create a scanner that covers a range of records.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&lt;<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getComparator--">getComparator</a></span>()</code>
<div class="block">Get an instance of the RawComparator that is constructed based on the
string comparator representation.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><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/io/file/tfile/TFile.Reader.html#getComparatorName--">getComparatorName</a></span>()</code>
<div class="block">Get the string representation of the comparator.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&lt;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.Entry.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner.Entry</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getEntryComparator--">getEntryComparator</a></span>()</code>
<div class="block">Get a Comparator object to compare Entries.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getEntryCount--">getEntryCount</a></span>()</code>
<div class="block">Get the number of key-value pair entries in TFile.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getFirstKey--">getFirstKey</a></span>()</code>
<div class="block">Get the first key in the TFile.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getKeyNear-long-">getKeyNear</a></span>(long&nbsp;offset)</code>
<div class="block">Get a sample key that is within a block whose starting offset is greater
than or equal to the specified offset.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getLastKey--">getLastKey</a></span>()</code>
<div class="block">Get the last key in the TFile.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getMetaBlock-java.lang.String-">getMetaBlock</a></span>(<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>&nbsp;name)</code>
<div class="block">Stream access to a meta block.``</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#getRecordNumNear-long-">getRecordNumNear</a></span>(long&nbsp;offset)</code>
<div class="block">Get the RecordNum for the first key-value pair in a compressed block
whose byte offset in the TFile is greater than or equal to the specified
offset.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#isSorted--">isSorted</a></span>()</code>
<div class="block">Is the TFile sorted?</div>
</td>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
<a name="Reader-org.apache.hadoop.fs.FSDataInputStream-long-org.apache.hadoop.conf.Configuration-">
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<h4>Reader</h4>
<pre>public&nbsp;Reader(<a href="../../../../../../org/apache/hadoop/fs/FSDataInputStream.html" title="class in org.apache.hadoop.fs">FSDataInputStream</a>&nbsp;fsdis,
long&nbsp;fileLength,
<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)
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">Constructor</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fsdis</code> - FS input stream of the TFile.</dd>
<dd><code>fileLength</code> - The length of TFile. This is required because we have no easy
way of knowing the actual size of the input file through the
File input stream.</dd>
<dd><code>conf</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>
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<pre>public&nbsp;void&nbsp;close()
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">Close the reader. The state of the Reader object is undefined after
close. Calling close() for multiple times has no effect.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></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>
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<pre>public&nbsp;<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>&nbsp;getComparatorName()</pre>
<div class="block">Get the string representation of the comparator.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>If the TFile is not sorted by keys, an empty string will be
returned. Otherwise, the actual comparator string that is
provided during the TFile creation time will be returned.</dd>
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<pre>public&nbsp;boolean&nbsp;isSorted()</pre>
<div class="block">Is the TFile sorted?</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if TFile is sorted.</dd>
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<pre>public&nbsp;long&nbsp;getEntryCount()</pre>
<div class="block">Get the number of key-value pair entries in TFile.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of key-value pairs in TFile</dd>
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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;getFirstKey()
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">Get the first key in the TFile.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The first key in the TFile.</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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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;getLastKey()
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">Get the last key in the TFile.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The last key in the TFile.</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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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&lt;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.Entry.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner.Entry</a>&gt;&nbsp;getEntryComparator()</pre>
<div class="block">Get a Comparator object to compare Entries. It is useful when you want
stores the entries in a collection (such as PriorityQueue) and perform
sorting or comparison among entries based on the keys without copying out
the key.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An Entry Comparator..</dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&lt;<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&gt;&nbsp;getComparator()</pre>
<div class="block">Get an instance of the RawComparator that is constructed based on the
string comparator representation.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Comparator that can compare RawComparable's.</dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</a>&nbsp;getMetaBlock(<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>&nbsp;name)
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>,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/MetaBlockDoesNotExist.html" title="class in org.apache.hadoop.io.file.tfile">MetaBlockDoesNotExist</a></pre>
<div class="block">Stream access to a meta block.``</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - The name of the meta block.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The input stream.</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> - on I/O error.</dd>
<dd><code><a href="../../../../../../org/apache/hadoop/io/file/tfile/MetaBlockDoesNotExist.html" title="class in org.apache.hadoop.io.file.tfile">MetaBlockDoesNotExist</a></code> - If the meta block with the name does not exist.</dd>
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<pre>public&nbsp;long&nbsp;getRecordNumNear(long&nbsp;offset)
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">Get the RecordNum for the first key-value pair in a compressed block
whose byte offset in the TFile is greater than or equal to the specified
offset.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>offset</code> - the user supplied offset.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the RecordNum to the corresponding entry. If no such entry
exists, it returns the total entry count.</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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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;getKeyNear(long&nbsp;offset)
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">Get a sample key that is within a block whose starting offset is greater
than or equal to the specified offset.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>offset</code> - The file offset.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the key that fits the requirement; or null if no such key exists
(which could happen if the offset is close to the end of the
TFile).</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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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScanner()
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">Get a scanner than can scan the whole TFile.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The scanner object. A valid Scanner is always returned even if
the TFile 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>
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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScannerByByteRange(long&nbsp;offset,
long&nbsp;length)
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">Get a scanner that covers a portion of TFile based on byte offsets.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>offset</code> - The beginning byte offset in the TFile.</dd>
<dd><code>length</code> - The length of the region.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The actual coverage of the returned scanner tries to match the
specified byte-region but always round up to the compression
block boundaries. It is possible that the returned scanner
contains zero key-value pairs even if length is positive.</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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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScanner(byte[]&nbsp;beginKey,
byte[]&nbsp;endKey)
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="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-byte:A-byte:A-"><code>createScannerByKey(byte[], byte[])</code></a> instead.</span></div>
<div class="block">Get a scanner that covers a portion of TFile based on keys.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>beginKey</code> - Begin key of the scan (inclusive). If null, scan from the first
key-value entry of the TFile.</dd>
<dd><code>endKey</code> - End key of the scan (exclusive). If null, scan up to the last
key-value entry of the TFile.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The actual coverage of the returned scanner will cover all keys
greater than or equal to the beginKey and less than the endKey.</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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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScannerByKey(byte[]&nbsp;beginKey,
byte[]&nbsp;endKey)
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">Get a scanner that covers a portion of TFile based on keys.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>beginKey</code> - Begin key of the scan (inclusive). If null, scan from the first
key-value entry of the TFile.</dd>
<dd><code>endKey</code> - End key of the scan (exclusive). If null, scan up to the last
key-value entry of the TFile.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The actual coverage of the returned scanner will cover all keys
greater than or equal to the beginKey and less than the endKey.</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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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScanner(<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;beginKey,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;endKey)
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="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.html#createScannerByKey-org.apache.hadoop.io.file.tfile.RawComparable-org.apache.hadoop.io.file.tfile.RawComparable-"><code>createScannerByKey(RawComparable, RawComparable)</code></a>
instead.</span></div>
<div class="block">Get a scanner that covers a specific key range.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>beginKey</code> - Begin key of the scan (inclusive). If null, scan from the first
key-value entry of the TFile.</dd>
<dd><code>endKey</code> - End key of the scan (exclusive). If null, scan up to the last
key-value entry of the TFile.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The actual coverage of the returned scanner will cover all keys
greater than or equal to the beginKey and less than the endKey.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScannerByKey(<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;beginKey,
<a href="../../../../../../org/apache/hadoop/io/file/tfile/RawComparable.html" title="interface in org.apache.hadoop.io.file.tfile">RawComparable</a>&nbsp;endKey)
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">Get a scanner that covers a specific key range.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>beginKey</code> - Begin key of the scan (inclusive). If null, scan from the first
key-value entry of the TFile.</dd>
<dd><code>endKey</code> - End key of the scan (exclusive). If null, scan up to the last
key-value entry of the TFile.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The actual coverage of the returned scanner will cover all keys
greater than or equal to the beginKey and less than the endKey.</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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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/io/file/tfile/TFile.Reader.Scanner.html" title="class in org.apache.hadoop.io.file.tfile">TFile.Reader.Scanner</a>&nbsp;createScannerByRecordNum(long&nbsp;beginRecNum,
long&nbsp;endRecNum)
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">Create a scanner that covers a range of records.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>beginRecNum</code> - The RecordNum for the first record (inclusive).</dd>
<dd><code>endRecNum</code> - The RecordNum for the last record (exclusive). To scan the whole
file, either specify endRecNum==-1 or endRecNum==getEntryCount().</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The TFile scanner that covers the specified range of records.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
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