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| <h2 title="Class MapFile" class="title">Class MapFile</h2> |
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| <li>org.apache.hadoop.io.MapFile</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">MapFile</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 file-based map from keys to values. |
| |
| <p>A map is a directory containing two files, the <code>data</code> file, |
| containing all keys and values in the map, and a smaller <code>index</code> |
| file, containing a fraction of the keys. The fraction is determined by |
| <a href="../../../../org/apache/hadoop/io/MapFile.Writer.html#getIndexInterval--"><code>MapFile.Writer.getIndexInterval()</code></a>. |
| |
| <p>The index file is read entirely into memory. Thus key implementations |
| should try to keep themselves small. |
| |
| <p>Map files are created by adding entries in-order. To maintain a large |
| database, perform updates by copying the previous version of a database and |
| merging in a sorted change list, to create a new version of the database in |
| a new file. Sorting large change lists can be done with <a href="../../../../org/apache/hadoop/io/SequenceFile.Sorter.html" title="class in org.apache.hadoop.io"><code>SequenceFile.Sorter</code></a>.</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.Merger.html" title="class in org.apache.hadoop.io">MapFile.Merger</a></span></code> |
| <div class="block">Class to merge multiple MapFiles of same Key and Value types to one MapFile</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">MapFile.Reader</a></span></code> |
| <div class="block">Provide access to an existing map.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.Writer.html" title="class in org.apache.hadoop.io">MapFile.Writer</a></span></code> |
| <div class="block">Writes a new map.</div> |
| </td> |
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| <td class="colFirst"><code>static <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/io/MapFile.html#DATA_FILE_NAME">DATA_FILE_NAME</a></span></code> |
| <div class="block">The name of the data file.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <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/io/MapFile.html#INDEX_FILE_NAME">INDEX_FILE_NAME</a></span></code> |
| <div class="block">The name of the index file.</div> |
| </td> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.html#MapFile--">MapFile</a></span>()</code> </td> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.html#delete-org.apache.hadoop.fs.FileSystem-java.lang.String-">delete</a></span>(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <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">Deletes the named map file.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.html#fix-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-java.lang.Class-java.lang.Class-boolean-org.apache.hadoop.conf.Configuration-">fix</a></span>(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> dir, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>> keyClass, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>> valueClass, |
| boolean dryrun, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">This method attempts to fix a corrupt MapFile by re-creating its index.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.html#main-java.lang.String:A-">main</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>[] args)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/MapFile.html#rename-org.apache.hadoop.fs.FileSystem-java.lang.String-java.lang.String-">rename</a></span>(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <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> oldName, |
| <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> newName)</code> |
| <div class="block">Renames an existing map directory.</div> |
| </td> |
| </tr> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a name="INDEX_FILE_NAME"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>INDEX_FILE_NAME</h4> |
| <pre>public static final <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> INDEX_FILE_NAME</pre> |
| <div class="block">The name of the index file.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.io.MapFile.INDEX_FILE_NAME">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="DATA_FILE_NAME"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>DATA_FILE_NAME</h4> |
| <pre>public static final <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> DATA_FILE_NAME</pre> |
| <div class="block">The name of the data file.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.io.MapFile.DATA_FILE_NAME">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
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| <h3>Constructor Detail</h3> |
| <a name="MapFile--"> |
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| <h4>MapFile</h4> |
| <pre>protected MapFile()</pre> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="rename-org.apache.hadoop.fs.FileSystem-java.lang.String-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>rename</h4> |
| <pre>public static void rename(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <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> oldName, |
| <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> newName) |
| 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">Renames an existing map directory.</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> |
| </dl> |
| </li> |
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| <a name="delete-org.apache.hadoop.fs.FileSystem-java.lang.String-"> |
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| </a> |
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| <li class="blockList"> |
| <h4>delete</h4> |
| <pre>public static void delete(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <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) |
| 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">Deletes the named map file.</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> |
| </dl> |
| </li> |
| </ul> |
| <a name="fix-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-java.lang.Class-java.lang.Class-boolean-org.apache.hadoop.conf.Configuration-"> |
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| <h4>fix</h4> |
| <pre>public static long fix(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> dir, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>> keyClass, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a>> valueClass, |
| boolean dryrun, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre> |
| <div class="block">This method attempts to fix a corrupt MapFile by re-creating its index.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fs</code> - filesystem</dd> |
| <dd><code>dir</code> - directory containing the MapFile data and index</dd> |
| <dd><code>keyClass</code> - key class (has to be a subclass of Writable)</dd> |
| <dd><code>valueClass</code> - value class (has to be a subclass of Writable)</dd> |
| <dd><code>dryrun</code> - do not perform any changes, just report what needs to be done</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of valid entries in this MapFile, or -1 if no fixing was needed</dd> |
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