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| <div class="subTitle">org.apache.hadoop.hdfs.server.namenode</div> |
| <h2 title="Enum NameNodeLayoutVersion.Feature" class="title">Enum NameNodeLayoutVersion.Feature</h2> |
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| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a><<a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a>></li> |
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| <li>org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion.Feature</li> |
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| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd>org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion</dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public static enum <span class="typeNameLabel">NameNodeLayoutVersion.Feature</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><<a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a>> |
| implements <a href="../../../../../../org/apache/hadoop/hdfs/protocol/LayoutVersion.LayoutFeature.html" title="interface in org.apache.hadoop.hdfs.protocol">LayoutVersion.LayoutFeature</a></pre> |
| <div class="block">Enums for features that change the layout version. |
| <br><br> |
| To add a new layout version: |
| <ul> |
| <li>Define a new enum constant with a short enum name, the new layout version |
| and description of the added feature.</li> |
| <li>When adding a layout version with an ancestor that is not same as |
| its immediate predecessor, use the constructor where a specific ancestor |
| can be passed. |
| </li> |
| <li>Specify a minimum compatible layout version. The minimum compatible |
| layout version is the earliest prior version to which a downgrade is |
| possible after initiating rolling upgrade. If the feature cannot satisfy |
| compatibility with any prior version, then set its minimum compatible |
| lqyout version to itself to indicate that downgrade is impossible. |
| Satisfying compatibility might require adding logic to the new feature to |
| reject operations or handle them differently while rolling upgrade is in |
| progress. In general, it's possible to satisfy compatiblity for downgrade |
| if the new feature just involves adding new edit log ops. Deeper |
| structural changes, such as changing the way we place files in the metadata |
| directories, might be incompatible. Feature implementations should strive |
| for compatibility, because it's in the best interest of our users to |
| support downgrade. |
| </ul></div> |
| </li> |
| </ul> |
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| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#APPEND_NEW_BLOCK">APPEND_NEW_BLOCK</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#BLOCK_STORAGE_POLICY">BLOCK_STORAGE_POLICY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#CREATE_OVERWRITE">CREATE_OVERWRITE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#EDITLOG_LENGTH">EDITLOG_LENGTH</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#ERASURE_CODING">ERASURE_CODING</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#EXPANDED_STRING_TABLE">EXPANDED_STRING_TABLE</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#QUOTA_BY_STORAGE_TYPE">QUOTA_BY_STORAGE_TYPE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#ROLLING_UPGRADE">ROLLING_UPGRADE</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#SNAPSHOT_MODIFICATION_TIME">SNAPSHOT_MODIFICATION_TIME</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#TRUNCATE">TRUNCATE</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#XATTRS">XATTRS</a></span></code> </td> |
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| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/protocol/LayoutVersion.FeatureInfo.html" title="class in org.apache.hadoop.hdfs.protocol">LayoutVersion.FeatureInfo</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#getInfo--">getInfo</a></span>()</code> </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#valueOf-java.lang.String-">valueOf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </td> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a></h3> |
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| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> ROLLING_UPGRADE</pre> |
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| <h4>EDITLOG_LENGTH</h4> |
| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> EDITLOG_LENGTH</pre> |
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| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> XATTRS</pre> |
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| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> CREATE_OVERWRITE</pre> |
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| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> XATTRS_NAMESPACE_EXT</pre> |
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| <pre>public static final <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> TRUNCATE</pre> |
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| <pre>public static <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (NameNodeLayoutVersion.Feature c : NameNodeLayoutVersion.Feature.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.Feature.html" title="enum in org.apache.hadoop.hdfs.server.namenode">NameNodeLayoutVersion.Feature</a> valueOf(<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> name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
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| <h4>getInfo</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/hdfs/protocol/LayoutVersion.FeatureInfo.html" title="class in org.apache.hadoop.hdfs.protocol">LayoutVersion.FeatureInfo</a> getInfo()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hdfs/protocol/LayoutVersion.LayoutFeature.html#getInfo--">getInfo</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hdfs/protocol/LayoutVersion.LayoutFeature.html" title="interface in org.apache.hadoop.hdfs.protocol">LayoutVersion.LayoutFeature</a></code></dd> |
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