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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 / ReplicaInPipeline.html
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<div class="subTitle">org.apache.hadoop.hdfs.server.datanode</div>
<h2 title="Interface ReplicaInPipeline" class="title">Interface ReplicaInPipeline</h2>
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<dt>All Superinterfaces:</dt>
<dd>org.apache.hadoop.hdfs.server.datanode.Replica</dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplicaInPipeline.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplicaInPipeline</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaBeingWritten.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaBeingWritten</a></dd>
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<pre>public interface <span class="typeNameLabel">ReplicaInPipeline</span>
extends org.apache.hadoop.hdfs.server.datanode.Replica</pre>
<div class="block">This defines the interface of a replica in Pipeline that's being written to</div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<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>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#attemptToSetWriter-java.lang.Thread-java.lang.Thread-">attemptToSetWriter</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;prevWriter,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;newWriter)</code>
<div class="block">Attempt to set the writer to a new value.</div>
</td>
</tr>
<tr id="i1" 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/ReplicaInPipeline.html#createRestartMetaStream--">createRestartMetaStream</a></span>()</code>
<div class="block">Create an output stream to write restart metadata in case of datanode
shutting down for quick restart.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">ReplicaOutputStreams</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#createStreams-boolean-org.apache.hadoop.util.DataChecksum-">createStreams</a></span>(boolean&nbsp;isCreate,
org.apache.hadoop.util.DataChecksum&nbsp;requestedChecksum)</code>
<div class="block">Create output streams for writing to this replica,
one for block file and one for CRC file</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#getBytesAcked--">getBytesAcked</a></span>()</code>
<div class="block">Get the number of bytes acked</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ChunkChecksum.html" title="class in org.apache.hadoop.hdfs.server.datanode">ChunkChecksum</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#getLastChecksumAndDataLen--">getLastChecksumAndDataLen</a></span>()</code>
<div class="block">gets the last chunk checksum and the length of the block corresponding
to that checksum</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#getReplicaInfo--">getReplicaInfo</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#interruptThread--">interruptThread</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#releaseAllBytesReserved--">releaseAllBytesReserved</a></span>()</code>
<div class="block">Release any disk space reserved for this replica.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#setBytesAcked-long-">setBytesAcked</a></span>(long&nbsp;bytesAcked)</code>
<div class="block">Set the number bytes that have acked</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaInPipeline.html#setLastChecksumAndDataLen-long-byte:A-">setLastChecksumAndDataLen</a></span>(long&nbsp;dataLength,
byte[]&nbsp;lastChecksum)</code>
<div class="block">store the checksum for the last chunk along with the data length</div>
</td>
</tr>
<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/ReplicaInPipeline.html#setNumBytes-long-">setNumBytes</a></span>(long&nbsp;bytesReceived)</code>
<div class="block">Set the number of bytes received</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/ReplicaInPipeline.html#setWriter-java.lang.Thread-">setWriter</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;writer)</code>
<div class="block">Set the thread that is writing to this replica</div>
</td>
</tr>
<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/ReplicaInPipeline.html#stopWriter-long-">stopWriter</a></span>(long&nbsp;xceiverStopTimeout)</code>
<div class="block">Interrupt the writing thread and wait until it dies.</div>
</td>
</tr>
<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/ReplicaInPipeline.html#waitForMinLength-long-long-java.util.concurrent.TimeUnit-">waitForMinLength</a></span>(long&nbsp;minLength,
long&nbsp;time,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit)</code>
<div class="block">Causes the current thread to wait until a minimum length is reached, the
thread is interrupted, or the specified waiting time elapses.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.hdfs.server.datanode.Replica</h3>
<code>getBlockId, getBytesOnDisk, getGenerationStamp, getNumBytes, getState, getStorageUuid, getVisibleLength, isOnTransientStorage</code></li>
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<pre>void&nbsp;setNumBytes(long&nbsp;bytesReceived)</pre>
<div class="block">Set the number of bytes received</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bytesReceived</code> - number of bytes received</dd>
</dl>
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<h4>getBytesAcked</h4>
<pre>long&nbsp;getBytesAcked()</pre>
<div class="block">Get the number of bytes acked</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of bytes acked</dd>
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<pre>void&nbsp;setBytesAcked(long&nbsp;bytesAcked)</pre>
<div class="block">Set the number bytes that have acked</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bytesAcked</code> - number bytes acked</dd>
</dl>
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<h4>releaseAllBytesReserved</h4>
<pre>void&nbsp;releaseAllBytesReserved()</pre>
<div class="block">Release any disk space reserved for this replica.</div>
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<h4>setLastChecksumAndDataLen</h4>
<pre>void&nbsp;setLastChecksumAndDataLen(long&nbsp;dataLength,
byte[]&nbsp;lastChecksum)</pre>
<div class="block">store the checksum for the last chunk along with the data length</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dataLength</code> - number of bytes on disk</dd>
<dd><code>lastChecksum</code> - - checksum bytes for the last chunk</dd>
</dl>
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<h4>getLastChecksumAndDataLen</h4>
<pre><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ChunkChecksum.html" title="class in org.apache.hadoop.hdfs.server.datanode">ChunkChecksum</a>&nbsp;getLastChecksumAndDataLen()</pre>
<div class="block">gets the last chunk checksum and the length of the block corresponding
to that checksum</div>
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<h4>createStreams</h4>
<pre><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/ReplicaOutputStreams.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">ReplicaOutputStreams</a>&nbsp;createStreams(boolean&nbsp;isCreate,
org.apache.hadoop.util.DataChecksum&nbsp;requestedChecksum)
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 output streams for writing to this replica,
one for block file and one for CRC file</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>isCreate</code> - if it is for creation</dd>
<dd><code>requestedChecksum</code> - the checksum the writer would prefer to use</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>output streams for writing</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> - if any error occurs</dd>
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<h4>createRestartMetaStream</h4>
<pre><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;createRestartMetaStream()
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 an output stream to write restart metadata in case of datanode
shutting down for quick restart.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>output stream for writing.</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> - if any error occurs</dd>
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<h4>getReplicaInfo</h4>
<pre>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo&nbsp;getReplicaInfo()</pre>
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<h4>setWriter</h4>
<pre>void&nbsp;setWriter(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;writer)</pre>
<div class="block">Set the thread that is writing to this replica</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>writer</code> - a thread writing to this replica</dd>
</dl>
</li>
</ul>
<a name="interruptThread--">
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<h4>interruptThread</h4>
<pre>void&nbsp;interruptThread()</pre>
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<h4>attemptToSetWriter</h4>
<pre>boolean&nbsp;attemptToSetWriter(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;prevWriter,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a>&nbsp;newWriter)</pre>
<div class="block">Attempt to set the writer to a new value.</div>
</li>
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<h4>stopWriter</h4>
<pre>void&nbsp;stopWriter(long&nbsp;xceiverStopTimeout)
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">Interrupt the writing thread and wait until it dies.</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> - the waiting is interrupted</dd>
</dl>
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<h4>waitForMinLength</h4>
<pre>void&nbsp;waitForMinLength(long&nbsp;minLength,
long&nbsp;time,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit)
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">Causes the current thread to wait until a minimum length is reached, the
thread is interrupted, or the specified waiting time elapses.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>minLength</code> - The minimum length to achieve</dd>
<dd><code>time</code> - the maximum time to wait</dd>
<dd><code>unit</code> - the time unit of the time argument</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> - if the current thread is interrupted or the minimum
length is not achieved within the time allowed.</dd>
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