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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 / namenode / snapshot / FileDiffList.html
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<div class="subTitle">org.apache.hadoop.hdfs.server.namenode.snapshot</div>
<h2 title="Class FileDiffList" class="title">Class FileDiffList</h2>
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<pre>public class <span class="typeNameLabel">FileDiffList</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></pre>
<div class="block">A list of FileDiffs for storing snapshot data.</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/namenode/snapshot/FileDiffList.html#FileDiffList--">FileDiffList</a></span>()</code>&nbsp;</td>
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<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="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>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/DiffList.html" title="interface in org.apache.hadoop.hdfs.server.namenode.snapshot">DiffList</a>&lt;D&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#asList--">asList</a></span>()</code>&nbsp;</td>
</tr>
<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/namenode/snapshot/FileDiffList.html#clear--">clear</a></span>()</code>
<div class="block">Clear the list.</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/namenode/snapshot/FileDiffList.html#deleteSnapshotDiff-org.apache.hadoop.hdfs.server.namenode.INode.ReclaimContext-int-int-N-">deleteSnapshotDiff</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/INode.ReclaimContext.html" title="class in org.apache.hadoop.hdfs.server.namenode">INode.ReclaimContext</a>&nbsp;reclaimContext,
int&nbsp;snapshot,
int&nbsp;prior,
N&nbsp;currentINode)</code>
<div class="block">Delete a snapshot.</div>
</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/namenode/snapshot/FileDiffList.html#destroyAndCollectSnapshotBlocks-org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo-">destroyAndCollectSnapshotBlocks</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/INode.BlocksMapUpdateInfo.html" title="class in org.apache.hadoop.hdfs.server.namenode">INode.BlocksMapUpdateInfo</a>&nbsp;collectedBlocks)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#findEarlierSnapshotBlocks-int-">findEarlierSnapshotBlocks</a></span>(int&nbsp;snapshotId)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#findLaterSnapshotBlocks-int-">findLaterSnapshotBlocks</a></span>(int&nbsp;snapshotId)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>D</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getDiffById-int-">getDiffById</a></span>(int&nbsp;snapshotId)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getDiffIndexById-int-">getDiffIndexById</a></span>(int&nbsp;snapshotId)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>D</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getLast--">getLast</a></span>()</code>&nbsp;</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/namenode/snapshot/FileDiffList.html#getLastSnapshotId--">getLastSnapshotId</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getPrior-int-">getPrior</a></span>(int&nbsp;snapshotId)</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getPrior-int-boolean-">getPrior</a></span>(int&nbsp;anchorId,
boolean&nbsp;exclusive)</code>
<div class="block">Find the latest snapshot before a given snapshot.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getSnapshotById-int-">getSnapshotById</a></span>(int&nbsp;snapshotId)</code>
<div class="block">Search for the snapshot whose id is 1) no less than the given id,
and 2) most close to the given id.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>A</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#getSnapshotINode-int-A-">getSnapshotINode</a></span>(int&nbsp;snapshotId,
A&nbsp;currentINode)</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#isEmpty--">isEmpty</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;D&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#iterator--">iterator</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#saveSelf2Snapshot-int-org.apache.hadoop.hdfs.server.namenode.INodeFile-org.apache.hadoop.hdfs.server.namenode.INodeFileAttributes-boolean-">saveSelf2Snapshot</a></span>(int&nbsp;latestSnapshotId,
org.apache.hadoop.hdfs.server.namenode.INodeFile&nbsp;iNodeFile,
org.apache.hadoop.hdfs.server.namenode.INodeFileAttributes&nbsp;snapshotCopy,
boolean&nbsp;withBlocks)</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>D</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#saveSelf2Snapshot-int-N-A-">saveSelf2Snapshot</a></span>(int&nbsp;latestSnapshotId,
N&nbsp;currentINode,
A&nbsp;snapshotCopy)</code>
<div class="block">Save the snapshot copy to the latest snapshot.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/FileDiffList.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li>
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<h3>Constructor Detail</h3>
<a name="FileDiffList--">
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<h4>FileDiffList</h4>
<pre>public&nbsp;FileDiffList()</pre>
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<h3>Method Detail</h3>
<a name="destroyAndCollectSnapshotBlocks-org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo-">
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<h4>destroyAndCollectSnapshotBlocks</h4>
<pre>public&nbsp;void&nbsp;destroyAndCollectSnapshotBlocks(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/INode.BlocksMapUpdateInfo.html" title="class in org.apache.hadoop.hdfs.server.namenode">INode.BlocksMapUpdateInfo</a>&nbsp;collectedBlocks)</pre>
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<h4>saveSelf2Snapshot</h4>
<pre>public&nbsp;void&nbsp;saveSelf2Snapshot(int&nbsp;latestSnapshotId,
org.apache.hadoop.hdfs.server.namenode.INodeFile&nbsp;iNodeFile,
org.apache.hadoop.hdfs.server.namenode.INodeFileAttributes&nbsp;snapshotCopy,
boolean&nbsp;withBlocks)</pre>
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<h4>findEarlierSnapshotBlocks</h4>
<pre>public&nbsp;org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo[]&nbsp;findEarlierSnapshotBlocks(int&nbsp;snapshotId)</pre>
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<h4>findLaterSnapshotBlocks</h4>
<pre>public&nbsp;org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo[]&nbsp;findLaterSnapshotBlocks(int&nbsp;snapshotId)</pre>
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<h4>asList</h4>
<pre>public final&nbsp;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/snapshot/DiffList.html" title="interface in org.apache.hadoop.hdfs.server.namenode.snapshot">DiffList</a>&lt;D&gt;&nbsp;asList()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>this list as a unmodifiable <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a>.</dd>
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<h4>isEmpty</h4>
<pre>public&nbsp;boolean&nbsp;isEmpty()</pre>
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<h4>clear</h4>
<pre>public&nbsp;void&nbsp;clear()</pre>
<div class="block">Clear the list.</div>
</li>
</ul>
<a name="deleteSnapshotDiff-org.apache.hadoop.hdfs.server.namenode.INode.ReclaimContext-int-int-org.apache.hadoop.hdfs.server.namenode.INode-">
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<h4>deleteSnapshotDiff</h4>
<pre>public final&nbsp;void&nbsp;deleteSnapshotDiff(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/INode.ReclaimContext.html" title="class in org.apache.hadoop.hdfs.server.namenode">INode.ReclaimContext</a>&nbsp;reclaimContext,
int&nbsp;snapshot,
int&nbsp;prior,
N&nbsp;currentINode)</pre>
<div class="block">Delete a snapshot. The synchronization of the diff list will be done
outside. If the diff to remove is not the first one in the diff list, we
need to combine the diff with its previous one.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reclaimContext</code> - blocks and inodes that need to be reclaimed</dd>
<dd><code>snapshot</code> - The id of the snapshot to be deleted</dd>
<dd><code>prior</code> - The id of the snapshot taken before the to-be-deleted snapshot</dd>
<dd><code>currentINode</code> - the inode where the snapshot diff is deleted</dd>
</dl>
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<a name="getLast--">
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<h4>getLast</h4>
<pre>public final&nbsp;D&nbsp;getLast()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the last diff.</dd>
</dl>
</li>
</ul>
<a name="getLastSnapshotId--">
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<h4>getLastSnapshotId</h4>
<pre>public final&nbsp;int&nbsp;getLastSnapshotId()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the id of the last snapshot.</dd>
</dl>
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<h4>getPrior</h4>
<pre>public final&nbsp;int&nbsp;getPrior(int&nbsp;anchorId,
boolean&nbsp;exclusive)</pre>
<div class="block">Find the latest snapshot before a given snapshot.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>anchorId</code> - The returned snapshot's id must be &lt;= or &lt; this
given snapshot id.</dd>
<dd><code>exclusive</code> - True means the returned snapshot's id must be &lt; the
given id, otherwise &lt;=.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The id of the latest snapshot before the given snapshot.</dd>
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<pre>public final&nbsp;int&nbsp;getPrior(int&nbsp;snapshotId)</pre>
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<pre>public final&nbsp;D&nbsp;getDiffById(int&nbsp;snapshotId)</pre>
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<pre>public final&nbsp;int&nbsp;getSnapshotById(int&nbsp;snapshotId)</pre>
<div class="block">Search for the snapshot whose id is 1) no less than the given id,
and 2) most close to the given id.</div>
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<pre>public final&nbsp;int&nbsp;getDiffIndexById(int&nbsp;snapshotId)</pre>
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<pre>public&nbsp;A&nbsp;getSnapshotINode(int&nbsp;snapshotId,
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the inode corresponding to the given snapshot.
Note that the current inode is returned if there is no change
between the given snapshot and the current state.</dd>
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<pre>public&nbsp;D&nbsp;saveSelf2Snapshot(int&nbsp;latestSnapshotId,
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<div class="block">Save the snapshot copy to the latest snapshot.</div>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;D&gt;&nbsp;iterator()</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
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<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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