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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 / LocalReplica.html
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<div class="subTitle">org.apache.hadoop.hdfs.server.datanode</div>
<h2 title="Class LocalReplica" class="title">Class LocalReplica</h2>
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<li>org.apache.hadoop.hdfs.protocol.Block</li>
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<li>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</li>
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<li>org.apache.hadoop.hdfs.server.datanode.LocalReplica</li>
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<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;org.apache.hadoop.hdfs.protocol.Block&gt;, org.apache.hadoop.hdfs.server.datanode.Replica, org.apache.hadoop.io.Writable, org.apache.hadoop.util.LightWeightGSet.LinkedElement</dd>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/FinalizedReplica.html" title="class in org.apache.hadoop.hdfs.server.datanode">FinalizedReplica</a>, <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/ReplicaUnderRecovery.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaUnderRecovery</a>, <a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/ReplicaWaitingToBeRecovered.html" title="class in org.apache.hadoop.hdfs.server.datanode">ReplicaWaitingToBeRecovered</a></dd>
</dl>
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<pre>public abstract class <span class="typeNameLabel">LocalReplica</span>
extends org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</pre>
<div class="block">This class is used for all replicas which are on local storage media
and hence, are backed by files.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.ReplicaDirInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplica.ReplicaDirInfo</a></span></code>&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hdfs.protocol.Block</h3>
<code>BLOCK_FILE_PREFIX, blockFilePattern, METADATA_EXTENSION, metaFilePattern, metaOrBlockFilePattern</code></li>
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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></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>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#blockDataExists--">blockDataExists</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#breakHardLinksIfNeeded--">breakHardLinksIfNeeded</a></span>()</code>
<div class="block">This function "breaks hardlinks" to the current replica file.</div>
</td>
</tr>
<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/LocalReplica.html#bumpReplicaGS-long-">bumpReplicaGS</a></span>(long&nbsp;newGS)</code>
<div class="block">Bump a replica's generation stamp to a new one.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#compareWith-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi.ScanInfo-">compareWith</a></span>(<a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi.ScanInfo</a>&nbsp;info)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#copyBlockdata-java.net.URI-">copyBlockdata</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destination)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#copyMetadata-java.net.URI-">copyMetadata</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destination)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#deleteBlockData--">deleteBlockData</a></span>()</code>
<div class="block">Used to deletes the replica's block data.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#deleteMetadata--">deleteMetadata</a></span>()</code>
<div class="block">Used to deletes the replica's metadata.</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/LocalReplica.html#fsyncDirectory--">fsyncDirectory</a></span>()</code>
<div class="block">Sync the parent directory changes to durable device.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getBlockDataLength--">getBlockDataLength</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getBlockFile--">getBlockFile</a></span>()</code>
<div class="block">Get the full path of this replica's data file.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getBlockURI--">getBlockURI</a></span>()</code>
<div class="block">Get the <code>URI</code> for where the data of this replica is stored.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getDataInputStream-long-">getDataInputStream</a></span>(long&nbsp;seekOffset)</code>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><code>InputStream</code></a> to the replica's data.</div>
</td>
</tr>
<tr id="i13" 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/LocalReplica.html#getDataOutputStream-boolean-">getDataOutputStream</a></span>(boolean&nbsp;append)</code>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to the replica's data.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getDir--">getDir</a></span>()</code>
<div class="block">Return the parent directory path where this replica is located.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/LengthInputStream.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">LengthInputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getMetadataInputStream-long-">getMetadataInputStream</a></span>(long&nbsp;offset)</code>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><code>InputStream</code></a> to the replica's metadata.</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/hdfs/server/datanode/LocalReplica.html#getMetadataLength--">getMetadataLength</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i17" 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/LocalReplica.html#getMetadataOutputStream-boolean-">getMetadataOutputStream</a></span>(boolean&nbsp;append)</code>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to the replica's metadata.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getMetadataURI--">getMetadataURI</a></span>()</code>
<div class="block">Get the <code>URI</code> for where the metadata of this replica is stored.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getMetaFile--">getMetaFile</a></span>()</code>
<div class="block">Get the full path of this replica's meta file.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getPinning-org.apache.hadoop.fs.LocalFileSystem-">getPinning</a></span>(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS)</code>
<div class="block">Check whether the block was pinned.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#getPinning-org.apache.hadoop.fs.LocalFileSystem-org.apache.hadoop.fs.Path-">getPinning</a></span>(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS,
org.apache.hadoop.fs.Path&nbsp;path)</code>
<div class="block">Get pin status of a file by checking the sticky bit.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#metadataExists--">metadataExists</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.ReplicaDirInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplica.ReplicaDirInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#parseBaseDir-java.io.File-long-">parseBaseDir</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;dir,
long&nbsp;blockId)</code>&nbsp;</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#renameData-java.net.URI-">renameData</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destURI)</code>
<div class="block">Rename the data <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a> to that referenced by <code>destURI</code>.</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#renameMeta-java.net.URI-">renameMeta</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destURI)</code>
<div class="block">Rename the metadata <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a> to that referenced by <code>destURI</code>.</div>
</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#setPinning-org.apache.hadoop.fs.LocalFileSystem-">setPinning</a></span>(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS)</code>
<div class="block">Set a block to be pinned on this datanode so that it cannot be moved
by Balancer/Mover.</div>
</td>
</tr>
<tr id="i27" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#setPinning-org.apache.hadoop.fs.LocalFileSystem-org.apache.hadoop.fs.Path-">setPinning</a></span>(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS,
org.apache.hadoop.fs.Path&nbsp;path)</code>
<div class="block">Set sticky bit on path to pin file.</div>
</td>
</tr>
<tr id="i28" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#truncateBlock-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-java.io.File-java.io.File-long-long-org.apache.hadoop.hdfs.server.datanode.FileIoProvider-">truncateBlock</a></span>(<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,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;blockFile,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;metaFile,
long&nbsp;oldlen,
long&nbsp;newlen,
org.apache.hadoop.hdfs.server.datanode.FileIoProvider&nbsp;fileIoProvider)</code>&nbsp;</td>
</tr>
<tr id="i29" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#truncateBlock-long-">truncateBlock</a></span>(long&nbsp;newLength)</code>&nbsp;</td>
</tr>
<tr id="i30" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.html#updateWithReplica-org.apache.hadoop.hdfs.server.datanode.StorageLocation-">updateWithReplica</a></span>(org.apache.hadoop.hdfs.server.datanode.StorageLocation&nbsp;replicaLocation)</code>
<div class="block">Update this replica with the <code>StorageLocation</code> found.</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</h3>
<code>createInfo, getBytesReserved, getFileIoProvider, getNext, getOriginalBytesReserved, getOriginalReplica, getRecoveryID, getStorageUuid, getVolume, isOnTransientStorage, setNext, setRecoveryID, toString</code></li>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hdfs.protocol.Block</h3>
<code>appendStringTo, compareTo, equals, filename2id, getBlockId, getBlockId, getBlockName, getGenerationStamp, getGenerationStamp, getNumBytes, hashCode, isBlockFilename, isMetaFilename, matchingIdAndGenStamp, metaToBlockFile, readFields, readId, set, setBlockId, setGenerationStamp, setNumBytes, toString, write, writeId</code></li>
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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#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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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.hdfs.server.datanode.Replica</h3>
<code>getBlockId, getBytesOnDisk, getGenerationStamp, getNumBytes, getState, getVisibleLength</code></li>
</ul>
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<h3>Method Detail</h3>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;getBlockFile()</pre>
<div class="block">Get the full path of this replica's data file.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the full path of this replica's data file</dd>
</dl>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;getMetaFile()</pre>
<div class="block">Get the full path of this replica's meta file.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the full path of this replica's meta file</dd>
</dl>
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<h4>getDir</h4>
<pre>protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;getDir()</pre>
<div class="block">Return the parent directory path where this replica is located.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the parent directory path where this replica is located</dd>
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<pre>public static&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/LocalReplica.ReplicaDirInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode">LocalReplica.ReplicaDirInfo</a>&nbsp;parseBaseDir(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;dir,
long&nbsp;blockId)</pre>
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<pre>public&nbsp;boolean&nbsp;breakHardLinksIfNeeded()
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">This function "breaks hardlinks" to the current replica file.
When doing a DataNode upgrade, we create a bunch of hardlinks to each block
file. This cleverly ensures that both the old and the new storage
directories can contain the same block file, without using additional space
for the data.
However, when we want to append to the replica file, we need to "break" the
hardlink to ensure that the old snapshot continues to contain the old data
length. If we failed to do that, we could roll back to the previous/
directory during a downgrade, and find that the block contents were longer
than they were at the time of upgrade.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>breakHardLinksIfNeeded</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true only if data was copied.</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/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;getBlockURI()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Get the <code>URI</code> for where the data of this replica is stored.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getBlockURI</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>URI</code> for the location of replica data.</dd>
</dl>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a>&nbsp;getDataInputStream(long&nbsp;seekOffset)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><code>InputStream</code></a> to the replica's data.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getDataInputStream</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>seekOffset</code> - the offset at which the read is started from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><code>InputStream</code></a> to read the replica data.</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 an error occurs in opening a stream to the data.</dd>
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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;getDataOutputStream(boolean&nbsp;append)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to the replica's data.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getDataOutputStream</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>append</code> - indicates if the block should be opened for append.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to write to the replica.</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 an error occurs in creating an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a>.</dd>
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<pre>public&nbsp;boolean&nbsp;blockDataExists()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>blockDataExists</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the replica's data exists.</dd>
</dl>
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<pre>public&nbsp;boolean&nbsp;deleteBlockData()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Used to deletes the replica's block data.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>deleteBlockData</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the replica's data is successfully deleted.</dd>
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<pre>public&nbsp;long&nbsp;getBlockDataLength()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getBlockDataLength</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the length of the block on storage.</dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;getMetadataURI()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Get the <code>URI</code> for where the metadata of this replica is stored.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getMetadataURI</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>URI</code> for the location of replica metadata.</dd>
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<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/LengthInputStream.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">LengthInputStream</a>&nbsp;getMetadataInputStream(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"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io"><code>InputStream</code></a> to the replica's metadata.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getMetadataInputStream</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>offset</code> - the offset at which the read is started from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/LengthInputStream.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset"><code>LengthInputStream</code></a> to read the replica metadata.</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/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</a>&nbsp;getMetadataOutputStream(boolean&nbsp;append)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Returns an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to the replica's metadata.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getMetadataOutputStream</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>append</code> - indicates if the block metadata should be opened for append.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a> to write to the replica's metadata.</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 an error occurs in creating an <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><code>OutputStream</code></a>.</dd>
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<pre>public&nbsp;boolean&nbsp;metadataExists()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>metadataExists</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the replica's metadata exists.</dd>
</dl>
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<pre>public&nbsp;boolean&nbsp;deleteMetadata()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Used to deletes the replica's metadata.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>deleteMetadata</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the replica's metadata is successfully deleted.</dd>
</dl>
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<pre>public&nbsp;long&nbsp;getMetadataLength()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getMetadataLength</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the length of the metadata on storage.</dd>
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<pre>public&nbsp;boolean&nbsp;renameMeta(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destURI)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Rename the metadata <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a> to that referenced by <code>destURI</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>renameMeta</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>destURI</code> - the target <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the rename is successful.</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 an exception occurs in the rename.</dd>
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<pre>public&nbsp;boolean&nbsp;renameData(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destURI)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Rename the data <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a> to that referenced by <code>destURI</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>renameData</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>destURI</code> - the target <a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net"><code>URI</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the rename is successful.</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 an exception occurs in the rename.</dd>
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<pre>public&nbsp;void&nbsp;updateWithReplica(org.apache.hadoop.hdfs.server.datanode.StorageLocation&nbsp;replicaLocation)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Update this replica with the <code>StorageLocation</code> found.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>updateWithReplica</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>replicaLocation</code> - the <code>StorageLocation</code> found for this replica.</dd>
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<h4>getPinning</h4>
<pre>public&nbsp;boolean&nbsp;getPinning(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Check whether the block was pinned.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getPinning</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>localFS</code> - the local filesystem to use.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the block is pinned.</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;setPinning(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Set a block to be pinned on this datanode so that it cannot be moved
by Balancer/Mover.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>setPinning</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>localFS</code> - the local filesystem to use.</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 there is an exception in the pinning.</dd>
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<pre>public&nbsp;void&nbsp;bumpReplicaGS(long&nbsp;newGS)
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="descfrmTypeLabel">Description copied from class:&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></span></div>
<div class="block">Bump a replica's generation stamp to a new one.
Its on-disk meta file name is renamed to be the new one too.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>bumpReplicaGS</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>newGS</code> - new generation stamp</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 change fails</dd>
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<pre>public&nbsp;void&nbsp;truncateBlock(long&nbsp;newLength)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>truncateBlock</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</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;int&nbsp;compareWith(<a href="../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html" title="class in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi.ScanInfo</a>&nbsp;info)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>compareWith</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</code></dd>
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<pre>public&nbsp;void&nbsp;copyMetadata(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destination)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>copyMetadata</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</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;copyBlockdata(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;destination)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>copyBlockdata</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.hdfs.server.datanode.ReplicaInfo</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;boolean&nbsp;getPinning(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS,
org.apache.hadoop.fs.Path&nbsp;path)
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 pin status of a file by checking the sticky bit.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>localFS</code> - local file system</dd>
<dd><code>path</code> - path to be checked</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the file is pinned with sticky bit</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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<h4>setPinning</h4>
<pre>public&nbsp;void&nbsp;setPinning(org.apache.hadoop.fs.LocalFileSystem&nbsp;localFS,
org.apache.hadoop.fs.Path&nbsp;path)
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">Set sticky bit on path to pin file.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>localFS</code> - local file system</dd>
<dd><code>path</code> - path to be pinned with sticky bit</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 static&nbsp;void&nbsp;truncateBlock(<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,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;blockFile,
<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;metaFile,
long&nbsp;oldlen,
long&nbsp;newlen,
org.apache.hadoop.hdfs.server.datanode.FileIoProvider&nbsp;fileIoProvider)
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;fsyncDirectory()
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 parent directory changes to durable device.</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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