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<div class="subTitle">org.apache.hadoop.hdfs.server.datanode.fsdataset</div>
<h2 title="Class FsVolumeSpi.ScanInfo" class="title">Class FsVolumeSpi.ScanInfo</h2>
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<li>org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi.ScanInfo</li>
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<dt>All Implemented Interfaces:</dt>
<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;<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>&gt;</dd>
</dl>
<dl>
<dt>Enclosing interface:</dt>
<dd><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a></dd>
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<pre>public static class <span class="typeNameLabel">FsVolumeSpi.ScanInfo</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/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;<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>&gt;</pre>
<div class="block">Tracks the files and other information related to a block on the disk
Missing file is indicated by setting the corresponding member
to null.
Because millions of these structures may be created, we try to save
memory here. So instead of storing full paths, we store path suffixes.
The block file, if it exists, will have a path like this:
&lt;volume_base_path&gt;/&lt;block_path&gt;
So we don't need to store the volume path, since we already know what the
volume is.
The metadata file, if it exists, will have a path like this:
&lt;volume_base_path&gt;/&lt;block_path&gt;_&lt;genstamp&gt;.meta
So if we have a block file, there isn't any need to store the block path
again.
The accessor functions take care of these manipulations.</div>
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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/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#ScanInfo-long-java.io.File-java.lang.String-java.lang.String-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-">ScanInfo</a></span>(long&nbsp;blockId,
<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;basePath,
<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;blockFile,
<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;metaFile,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;vol)</code>
<div class="block">Create a ScanInfo object for a block.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#ScanInfo-long-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-org.apache.hadoop.hdfs.server.common.FileRegion-long-">ScanInfo</a></span>(long&nbsp;blockId,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;vol,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/common/FileRegion.html" title="class in org.apache.hadoop.hdfs.server.common">FileRegion</a>&nbsp;fileRegion,
long&nbsp;length)</code>
<div class="block">Create a ScanInfo object for a block.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#compareTo-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi.ScanInfo-">compareTo</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;b)</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/fsdataset/FsVolumeSpi.ScanInfo.html#equals-java.lang.Object-">equals</a></span>(<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>&nbsp;o)</code>&nbsp;</td>
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<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/fsdataset/FsVolumeSpi.ScanInfo.html#getBlockFile--">getBlockFile</a></span>()</code>
<div class="block">Returns the block data 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/fsdataset/FsVolumeSpi.ScanInfo.html#getBlockId--">getBlockId</a></span>()</code>
<div class="block">Returns the block ID.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#getBlockLength--">getBlockLength</a></span>()</code>
<div class="block">Return the length of the data block.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/hadoop/hdfs/server/common/FileRegion.html" title="class in org.apache.hadoop.hdfs.server.common">FileRegion</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#getFileRegion--">getFileRegion</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#getGenStamp--">getGenStamp</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" 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/fsdataset/FsVolumeSpi.ScanInfo.html#getMetaFile--">getMetaFile</a></span>()</code>
<div class="block">Returns the block meta data file or null if there isn't one.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#getVolume--">getVolume</a></span>()</code>
<div class="block">Returns the volume that contains the block that this object describes.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.ScanInfo.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
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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#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
<a name="ScanInfo-long-java.io.File-java.lang.String-java.lang.String-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-">
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<h4>ScanInfo</h4>
<pre>public&nbsp;ScanInfo(long&nbsp;blockId,
<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;basePath,
<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;blockFile,
<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;metaFile,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;vol)</pre>
<div class="block">Create a ScanInfo object for a block. This constructor will examine
the block data and meta-data files.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>blockId</code> - the block ID</dd>
<dd><code>basePath</code> - The full path to the directory the block is stored in</dd>
<dd><code>blockFile</code> - The block filename, with no path</dd>
<dd><code>metaFile</code> - The meta filename, with no path. If blockFile is not null
then the metaFile and blockFile should have the same
prefix, with the meta file having a suffix like
"_1234.meta". To save memory, if the blockFile is present
we store only the meta file suffix in the object</dd>
<dd><code>vol</code> - the volume that contains the block</dd>
</dl>
</li>
</ul>
<a name="ScanInfo-long-org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi-org.apache.hadoop.hdfs.server.common.FileRegion-long-">
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<h4>ScanInfo</h4>
<pre>public&nbsp;ScanInfo(long&nbsp;blockId,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;vol,
<a href="../../../../../../../org/apache/hadoop/hdfs/server/common/FileRegion.html" title="class in org.apache.hadoop.hdfs.server.common">FileRegion</a>&nbsp;fileRegion,
long&nbsp;length)</pre>
<div class="block">Create a ScanInfo object for a block. This constructor will examine
the block data and meta-data files.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>blockId</code> - the block ID</dd>
<dd><code>vol</code> - the volume that contains the block</dd>
<dd><code>fileRegion</code> - the file region (for provided blocks)</dd>
<dd><code>length</code> - the length of the block data</dd>
</dl>
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<h4>getBlockFile</h4>
<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">Returns the block data file.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the block data file</dd>
</dl>
</li>
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<a name="getBlockLength--">
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<h4>getBlockLength</h4>
<pre>public&nbsp;long&nbsp;getBlockLength()</pre>
<div class="block">Return the length of the data block. The length returned is the length
cached when this object was created.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the length of the data block</dd>
</dl>
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<h4>getMetaFile</h4>
<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">Returns the block meta data file or null if there isn't one.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the block meta data file</dd>
</dl>
</li>
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<a name="getBlockId--">
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<h4>getBlockId</h4>
<pre>public&nbsp;long&nbsp;getBlockId()</pre>
<div class="block">Returns the block ID.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the block ID</dd>
</dl>
</li>
</ul>
<a name="getVolume--">
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<h4>getVolume</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.html" title="interface in org.apache.hadoop.hdfs.server.datanode.fsdataset">FsVolumeSpi</a>&nbsp;getVolume()</pre>
<div class="block">Returns the volume that contains the block that this object describes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the volume</dd>
</dl>
</li>
</ul>
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<pre>public&nbsp;int&nbsp;compareTo(<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;b)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true#compareTo-T-" title="class or interface in java.lang">compareTo</a></code>&nbsp;in interface&nbsp;<code><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;<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>&gt;</code></dd>
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<h4>equals</h4>
<pre>public&nbsp;boolean&nbsp;equals(<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>&nbsp;o)</pre>
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