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<div class="subTitle">org.apache.hadoop.hbase.io</div>
<h2 title="Class Reference" class="title">Class Reference</h2>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.58">Reference</a>
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></pre>
<div class="block">A reference to the top or bottom half of a store file where 'bottom' is the first half
of the file containing the keys that sort lowest and 'top' is the second half
of the file with keys that sort greater than those of the bottom half. The file referenced
lives under a different region. References are made at region split time.
<p>References work with a special half store file type. References know how
to write out the reference format in the file system and are what is juggled
when references are mixed in with direct store files. The half store file
type is used reading the referred to file.
<p>References to store files located over in some other region look like
this in the file system
<code>1278437856009925445.3323223323</code>:
i.e. an id followed by hash of the referenced region.
Note, a region is itself not splittable if it has instances of store file
references. References are cleaned up by compactions.</div>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</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>(package private) static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.Range.html" title="enum in org.apache.hadoop.hbase.io">Reference.Range</a></span></code>
<div class="block">For split HStoreFiles, it specifies if the file covers the lower half or
the upper half of the key range</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/io/Reference.Range.html" title="enum in org.apache.hadoop.hbase.io">Reference.Range</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#region">region</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#splitkey">splitkey</a></span></code>&nbsp;</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/hbase/io/Reference.html#Reference--">Reference</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">need by pb serialization</span></div>
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<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#Reference-byte:A-org.apache.hadoop.hbase.io.Reference.Range-">Reference</a></span>(byte[]&nbsp;splitRow,
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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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<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>org.apache.hadoop.hbase.shaded.protobuf.generated.FSProtos.Reference</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#convert--">convert</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a></code></td>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#createBottomReference-byte:A-">createBottomReference</a></span>(byte[]&nbsp;splitRow)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#createTopReference-byte:A-">createTopReference</a></span>(byte[]&nbsp;splitRow)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/io/Reference.Range.html" title="enum in org.apache.hadoop.hbase.io">Reference.Range</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#getFileRegion--">getFileRegion</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#getSplitKey--">getSplitKey</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#isTopFileRegion-org.apache.hadoop.hbase.io.Reference.Range-">isTopFileRegion</a></span>(<a href="../../../../../org/apache/hadoop/hbase/io/Reference.Range.html" title="enum in org.apache.hadoop.hbase.io">Reference.Range</a>&nbsp;r)</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#read-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-">read</a></span>(org.apache.hadoop.fs.FileSystem&nbsp;fs,
org.apache.hadoop.fs.Path&nbsp;p)</code>
<div class="block">Read a Reference from FileSystem.</div>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Writables are going away. Use the pb serialization methods instead.
Remove in a release after 0.96 goes out. This is here only to migrate
old Reference files written with Writables before 0.96.</span></div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>(package private) byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#toByteArray--">toByteArray</a></span>()</code>
<div class="block">Use this when writing to a stream and you want to use the pb mergeDelimitedFrom
(w/o the delimiter, pb reads to EOF which may not be what you want).</div>
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<tr id="i12" class="altColor">
<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/hbase/io/Reference.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>org.apache.hadoop.fs.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/io/Reference.html#write-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-">write</a></span>(org.apache.hadoop.fs.FileSystem&nbsp;fs,
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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#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#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#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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<pre>private&nbsp;byte[] <a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.59">splitkey</a></pre>
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<pre><a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.94">Reference</a>(byte[]&nbsp;splitRow,
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<div class="block">Constructor</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>splitRow</code> - This is row we are splitting around.</dd>
<dd><code>fr</code> - </dd>
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">need by pb serialization</span></div>
<div class="block">Used by serializations.</div>
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<pre>public static&nbsp;<a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.77">createTopReference</a>(byte[]&nbsp;splitRow)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>splitRow</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io"><code>Reference</code></a> that points at top half of a an hfile</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io">Reference</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.85">createBottomReference</a>(byte[]&nbsp;splitRow)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="../../../../../org/apache/hadoop/hbase/io/Reference.html" title="class in org.apache.hadoop.hbase.io"><code>Reference</code></a> that points at the bottom half of a an hfile</dd>
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<h4>getFileRegion</h4>
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<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Range</dd>
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<h4>getSplitKey</h4>
<pre>public&nbsp;byte[]&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.121">getSplitKey</a>()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>splitKey</dd>
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<a name="toString--">
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<h4>toString</h4>
<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;<a href="../../../../../src-html/org/apache/hadoop/hbase/io/Reference.html#line.129">toString</a>()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><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></code>&nbsp;in class&nbsp;<code><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></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><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"><code>Object.toString()</code></a></dd>
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Writables are going away. Use the pb serialization methods instead.
Remove in a release after 0.96 goes out. This is here only to migrate
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<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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<dt><span class="paramLabel">Parameters:</span></dt>
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<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">Use this when writing to a stream and you want to use the pb mergeDelimitedFrom
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<dt><span class="returnLabel">Returns:</span></dt>
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<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><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></code>&nbsp;in class&nbsp;<code><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></code></dd>
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