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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-project-dist / hadoop-hdfs / build / source / hadoop-hdfs-project / hadoop-hdfs / target / api / org / apache / hadoop / hdfs / server / datanode / fsdataset / ReplicaOutputStreams.html
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<div class="subTitle">org.apache.hadoop.hdfs.server.datanode.fsdataset</div>
<h2 title="Class ReplicaOutputStreams" class="title">Class ReplicaOutputStreams</h2>
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<li>org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams</li>
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<pre>public class <span class="typeNameLabel">ReplicaOutputStreams</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">Contains the output streams for the data and checksum of a replica.</div>
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<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>static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#LOG">LOG</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#ReplicaOutputStreams-java.io.OutputStream-java.io.OutputStream-org.apache.hadoop.util.DataChecksum-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-org.apache.hadoop.hdfs.server.datanode.FileIoProvider-">ReplicaOutputStreams</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;dataOut,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;checksumOut,
org.apache.hadoop.util.DataChecksum&nbsp;checksum,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;volume,
org.apache.hadoop.hdfs.server.datanode.FileIoProvider&nbsp;fileIoProvider)</code>
<div class="block">Create an object with a data output stream, a checksum output stream
and a checksum.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#close--">close</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#closeDataStream--">closeDataStream</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#dropCacheBehindWrites-java.lang.String-long-long-int-">dropCacheBehindWrites</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;identifier,
long&nbsp;offset,
long&nbsp;len,
int&nbsp;flags)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#flushChecksumOut--">flushChecksumOut</a></span>()</code>
<div class="block">Flush the checksum stream if it supports it.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#flushDataOut--">flushDataOut</a></span>()</code>
<div class="block">Flush the data stream if it supports it.</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.util.DataChecksum</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#getChecksum--">getChecksum</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#getChecksumOut--">getChecksumOut</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#getDataOut--">getDataOut</a></span>()</code>&nbsp;</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/FileDescriptor.html?is-external=true" title="class or interface in java.io">FileDescriptor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#getOutFd--">getOutFd</a></span>()</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#isTransientStorage--">isTransientStorage</a></span>()</code>&nbsp;</td>
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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/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#syncChecksumOut--">syncChecksumOut</a></span>()</code>
<div class="block">Sync the checksum stream if it supports it.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#syncDataOut--">syncDataOut</a></span>()</code>
<div class="block">Sync the data stream if it supports it.</div>
</td>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#syncFileRangeIfPossible-long-long-int-">syncFileRangeIfPossible</a></span>(long&nbsp;offset,
long&nbsp;nbytes,
int&nbsp;flags)</code>&nbsp;</td>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html#writeDataToDisk-byte:A-int-int-">writeDataToDisk</a></span>(byte[]&nbsp;b,
int&nbsp;off,
int&nbsp;len)</code>&nbsp;</td>
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<h4>LOG</h4>
<pre>public static final&nbsp;org.slf4j.Logger LOG</pre>
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<a name="ReplicaOutputStreams-java.io.OutputStream-java.io.OutputStream-org.apache.hadoop.util.DataChecksum-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-org.apache.hadoop.hdfs.server.datanode.FileIoProvider-">
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<h4>ReplicaOutputStreams</h4>
<pre>public&nbsp;ReplicaOutputStreams(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;dataOut,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;checksumOut,
org.apache.hadoop.util.DataChecksum&nbsp;checksum,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;volume,
org.apache.hadoop.hdfs.server.datanode.FileIoProvider&nbsp;fileIoProvider)</pre>
<div class="block">Create an object with a data output stream, a checksum output stream
and a checksum.</div>
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<h4>getOutFd</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/FileDescriptor.html?is-external=true" title="class or interface in java.io">FileDescriptor</a>&nbsp;getOutFd()</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;getDataOut()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the data output stream.</dd>
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<h4>getChecksumOut</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;getChecksumOut()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the checksum output stream.</dd>
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<h4>getChecksum</h4>
<pre>public&nbsp;org.apache.hadoop.util.DataChecksum&nbsp;getChecksum()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the checksum.</dd>
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<h4>isTransientStorage</h4>
<pre>public&nbsp;boolean&nbsp;isTransientStorage()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>is writing to a transient storage?</dd>
</dl>
</li>
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()</pre>
<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>
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<h4>closeDataStream</h4>
<pre>public&nbsp;void&nbsp;closeDataStream()
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="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;syncDataOut()
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">Sync the data stream if it supports it.</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>
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<h4>syncChecksumOut</h4>
<pre>public&nbsp;void&nbsp;syncChecksumOut()
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">Sync the checksum stream if it supports it.</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>
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<h4>flushDataOut</h4>
<pre>public&nbsp;void&nbsp;flushDataOut()
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">Flush the data stream if it supports it.</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>
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<h4>flushChecksumOut</h4>
<pre>public&nbsp;void&nbsp;flushChecksumOut()
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">Flush the checksum stream if it supports it.</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>
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<h4>writeDataToDisk</h4>
<pre>public&nbsp;void&nbsp;writeDataToDisk(byte[]&nbsp;b,
int&nbsp;off,
int&nbsp;len)
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="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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<h4>syncFileRangeIfPossible</h4>
<pre>public&nbsp;void&nbsp;syncFileRangeIfPossible(long&nbsp;offset,
long&nbsp;nbytes,
int&nbsp;flags)
throws org.apache.hadoop.io.nativeio.NativeIOException</pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.hadoop.io.nativeio.NativeIOException</code></dd>
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<h4>dropCacheBehindWrites</h4>
<pre>public&nbsp;void&nbsp;dropCacheBehindWrites(<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;identifier,
long&nbsp;offset,
long&nbsp;len,
int&nbsp;flags)
throws org.apache.hadoop.io.nativeio.NativeIOException</pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.hadoop.io.nativeio.NativeIOException</code></dd>
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