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| <div class="subTitle">org.apache.hadoop.filecache</div> |
| <h2 title="Class DistributedCache" class="title">Class DistributedCache</h2> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.filecache.DistributedCache</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.filecache.DistributedCache</li> |
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| <div class="description"> |
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| <hr> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span></div> |
| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public class <span class="typeNameLabel">DistributedCache</span> |
| extends org.apache.hadoop.mapreduce.filecache.DistributedCache</pre> |
| <div class="block">Distribute application-specific large, read-only files efficiently. |
| |
| <p><code>DistributedCache</code> is a facility provided by the Map-Reduce |
| framework to cache files (text, archives, jars etc.) needed by applications. |
| </p> |
| |
| <p>Applications specify the files, via urls (hdfs:// or http://) to be cached |
| via the <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a>. The |
| <code>DistributedCache</code> assumes that the files specified via urls are |
| already present on the <a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><code>FileSystem</code></a> at the path specified by the url |
| and are accessible by every machine in the cluster.</p> |
| |
| <p>The framework will copy the necessary files on to the worker node before |
| any tasks for the job are executed on that node. Its efficiency stems from |
| the fact that the files are only copied once per job and the ability to |
| cache archives which are un-archived on the workers.</p> |
| |
| <p><code>DistributedCache</code> can be used to distribute simple, read-only |
| data/text files and/or more complex types such as archives, jars etc. |
| Archives (zip, tar and tgz/tar.gz files) are un-archived at the worker nodes. |
| Jars may be optionally added to the classpath of the tasks, a rudimentary |
| software distribution mechanism. Files have execution permissions. |
| In older version of Hadoop Map/Reduce users could optionally ask for symlinks |
| to be created in the working directory of the child task. In the current |
| version symlinks are always created. If the URL does not have a fragment |
| the name of the file or directory will be used. If multiple files or |
| directories map to the same link name, the last one added, will be used. All |
| others will not even be downloaded.</p> |
| |
| <p><code>DistributedCache</code> tracks modification timestamps of the cache |
| files. Clearly the cache files should not be modified by the application |
| or externally while the job is executing.</p> |
| |
| <p>Here is an illustrative example on how to use the |
| <code>DistributedCache</code>:</p> |
| <p><blockquote><pre> |
| // Setting up the cache for the application |
| |
| 1. Copy the requisite files to the <code>FileSystem</code>: |
| |
| $ bin/hadoop fs -copyFromLocal lookup.dat /myapp/lookup.dat |
| $ bin/hadoop fs -copyFromLocal map.zip /myapp/map.zip |
| $ bin/hadoop fs -copyFromLocal mylib.jar /myapp/mylib.jar |
| $ bin/hadoop fs -copyFromLocal mytar.tar /myapp/mytar.tar |
| $ bin/hadoop fs -copyFromLocal mytgz.tgz /myapp/mytgz.tgz |
| $ bin/hadoop fs -copyFromLocal mytargz.tar.gz /myapp/mytargz.tar.gz |
| |
| 2. Setup the application's <code>JobConf</code>: |
| |
| JobConf job = new JobConf(); |
| DistributedCache.addCacheFile(new URI("/myapp/lookup.dat#lookup.dat"), |
| job); |
| DistributedCache.addCacheArchive(new URI("/myapp/map.zip"), job); |
| DistributedCache.addFileToClassPath(new Path("/myapp/mylib.jar"), job); |
| DistributedCache.addCacheArchive(new URI("/myapp/mytar.tar"), job); |
| DistributedCache.addCacheArchive(new URI("/myapp/mytgz.tgz"), job); |
| DistributedCache.addCacheArchive(new URI("/myapp/mytargz.tar.gz"), job); |
| |
| 3. Use the cached files in the <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a> |
| or <a href="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><code>Reducer</code></a>: |
| |
| public static class MapClass extends MapReduceBase |
| implements Mapper<K, V, K, V> { |
| |
| private Path[] localArchives; |
| private Path[] localFiles; |
| |
| public void configure(JobConf job) { |
| // Get the cached archives/files |
| File f = new File("./map.zip/some/file/in/zip.txt"); |
| } |
| |
| public void map(K key, V value, |
| OutputCollector<K, V> output, Reporter reporter) |
| throws IOException { |
| // Use data from the cached archives/files here |
| // ... |
| // ... |
| output.collect(k, v); |
| } |
| } |
| |
| </pre></blockquote> |
| |
| It is also very common to use the DistributedCache by using |
| <code>GenericOptionsParser</code>. |
| |
| This class includes methods that should be used by users |
| (specifically those mentioned in the example above, as well |
| as <code>DistributedCache.addArchiveToClassPath(Path, Configuration)</code>), |
| as well as methods intended for use by the MapReduce framework |
| (e.g., <a href="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><code>JobClient</code></a>).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a>, |
| <a href="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><code>JobClient</code></a>, |
| <a href="../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce"><code>Job</code></a></dd> |
| </dl> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <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/filecache/DistributedCache.html#CACHE_ARCHIVES">CACHE_ARCHIVES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </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/filecache/DistributedCache.html#CACHE_ARCHIVES_SIZES">CACHE_ARCHIVES_SIZES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <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/filecache/DistributedCache.html#CACHE_ARCHIVES_TIMESTAMPS">CACHE_ARCHIVES_TIMESTAMPS</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </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/filecache/DistributedCache.html#CACHE_FILES">CACHE_FILES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <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/filecache/DistributedCache.html#CACHE_FILES_SIZES">CACHE_FILES_SIZES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </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/filecache/DistributedCache.html#CACHE_FILES_TIMESTAMPS">CACHE_FILES_TIMESTAMPS</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <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/filecache/DistributedCache.html#CACHE_LOCALARCHIVES">CACHE_LOCALARCHIVES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </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/filecache/DistributedCache.html#CACHE_LOCALFILES">CACHE_LOCALFILES</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <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/filecache/DistributedCache.html#CACHE_SYMLINK">CACHE_SYMLINK</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="fields.inherited.from.class.org.apache.hadoop.mapreduce.filecache.DistributedCache"> |
| <!-- --> |
| </a> |
| <h3>Fields inherited from class org.apache.hadoop.mapreduce.filecache.DistributedCache</h3> |
| <code>WILDCARD</code></li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
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| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#DistributedCache--">DistributedCache</a></span>()</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <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>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#addLocalArchives-org.apache.hadoop.conf.Configuration-java.lang.String-">addLocalArchives</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#addLocalFiles-org.apache.hadoop.conf.Configuration-java.lang.String-">addLocalFiles</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </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/filecache/DistributedCache.html#createAllSymlink-org.apache.hadoop.conf.Configuration-java.io.File-java.io.File-">createAllSymlink</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> jobCacheDir, |
| <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> workDir)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">Internal to MapReduce framework. Use DistributedCacheManager |
| instead.</span></div> |
| </div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/fs/FileStatus.html" title="class in org.apache.hadoop.fs">FileStatus</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#getFileStatus-org.apache.hadoop.conf.Configuration-java.net.URI-">getFileStatus</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> cache)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#getTimestamp-org.apache.hadoop.conf.Configuration-java.net.URI-">getTimestamp</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> cache)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#setArchiveTimestamps-org.apache.hadoop.conf.Configuration-java.lang.String-">setArchiveTimestamps</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> timestamps)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#setFileTimestamps-org.apache.hadoop.conf.Configuration-java.lang.String-">setFileTimestamps</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> timestamps)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#setLocalArchives-org.apache.hadoop.conf.Configuration-java.lang.String-">setLocalArchives</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#setLocalFiles-org.apache.hadoop.conf.Configuration-java.lang.String-">setLocalFiles</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.hadoop.mapreduce.filecache.DistributedCache"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.hadoop.mapreduce.filecache.DistributedCache</h3> |
| <code>addArchiveToClassPath, addArchiveToClassPath, addCacheArchive, addCacheFile, addFileToClassPath, addFileToClassPath, addFileToClassPath, checkURIs, createSymlink, getArchiveClassPaths, getArchiveTimestamps, getArchiveVisibilities, getCacheArchives, getCacheFiles, getFileClassPaths, getFileTimestamps, getFileVisibilities, getLocalCacheArchives, getLocalCacheFiles, getSymlink, setCacheArchives, setCacheFiles</code></li> |
| </ul> |
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| </a> |
| <h3>Methods inherited from class 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#equals-java.lang.Object-" title="class or interface in java.lang">equals</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#hashCode--" title="class or interface in java.lang">hashCode</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> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="CACHE_FILES_SIZES"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_FILES_SIZES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_FILES_SIZES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_FILES_SIZES"><code>CACHE_FILES_SIZES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_FILES_SIZES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_FILES_SIZES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_ARCHIVES_SIZES"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_ARCHIVES_SIZES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_ARCHIVES_SIZES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_ARCHIVES_SIZES"><code>CACHE_ARCHIVES_SIZES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_ARCHIVES_SIZES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_ARCHIVES_SIZES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_ARCHIVES_TIMESTAMPS"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_ARCHIVES_TIMESTAMPS</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_ARCHIVES_TIMESTAMPS</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_ARCHIVES_TIMESTAMPS"><code>CACHE_ARCHIVES_TIMESTAMPS</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_ARCHIVES_TIMESTAMPS</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_ARCHIVES_TIMESTAMPS">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_FILES_TIMESTAMPS"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_FILES_TIMESTAMPS</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_FILES_TIMESTAMPS</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_FILES_TIMESTAMPS"><code>CACHE_FILES_TIMESTAMPS</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_FILE_TIMESTAMPS</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_FILES_TIMESTAMPS">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_ARCHIVES"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_ARCHIVES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_ARCHIVES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_ARCHIVES"><code>CACHE_ARCHIVES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_ARCHIVES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_ARCHIVES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_FILES"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_FILES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_FILES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_FILES"><code>CACHE_FILES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_FILES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_FILES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_LOCALARCHIVES"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_LOCALARCHIVES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_LOCALARCHIVES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_LOCALARCHIVES"><code>CACHE_LOCALARCHIVES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_LOCALARCHIVES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_LOCALARCHIVES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_LOCALFILES"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CACHE_LOCALFILES</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_LOCALFILES</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_LOCALFILES"><code>CACHE_LOCALFILES</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_LOCALFILES</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_LOCALFILES">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="CACHE_SYMLINK"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>CACHE_SYMLINK</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> CACHE_SYMLINK</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Warning: <a href="../../../../org/apache/hadoop/filecache/DistributedCache.html#CACHE_SYMLINK"><code>CACHE_SYMLINK</code></a> is not a *public* constant. |
| The variable is kept for M/R 1.x applications, M/R 2.x applications should |
| use <code>MRJobConfig.CACHE_SYMLINK</code></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.filecache.DistributedCache.CACHE_SYMLINK">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="DistributedCache--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>DistributedCache</h4> |
| <pre>public DistributedCache()</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="addLocalArchives-org.apache.hadoop.conf.Configuration-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addLocalArchives</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void addLocalArchives(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Add a archive that has been localized to the conf. Used |
| by internal DistributedCache code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The conf to modify to contain the localized caches</dd> |
| <dd><code>str</code> - a comma separated list of local archives</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addLocalFiles-org.apache.hadoop.conf.Configuration-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addLocalFiles</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void addLocalFiles(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Add a file that has been localized to the conf.. Used |
| by internal DistributedCache code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The conf to modify to contain the localized caches</dd> |
| <dd><code>str</code> - a comma separated list of local files</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createAllSymlink-org.apache.hadoop.conf.Configuration-java.io.File-java.io.File-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>createAllSymlink</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void createAllSymlink(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> jobCacheDir, |
| <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> workDir) |
| 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="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">Internal to MapReduce framework. Use DistributedCacheManager |
| instead.</span></div> |
| <div class="block">This method create symlinks for all files in a given dir in another |
| directory. Currently symlinks cannot be disabled. This is a NO-OP.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the configuration</dd> |
| <dd><code>jobCacheDir</code> - the target directory for creating symlinks</dd> |
| <dd><code>workDir</code> - the directory in which the symlinks are created</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> |
| </li> |
| </ul> |
| <a name="getFileStatus-org.apache.hadoop.conf.Configuration-java.net.URI-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getFileStatus</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static <a href="../../../../org/apache/hadoop/fs/FileStatus.html" title="class in org.apache.hadoop.fs">FileStatus</a> getFileStatus(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> cache) |
| 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="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Returns <a href="../../../../org/apache/hadoop/fs/FileStatus.html" title="class in org.apache.hadoop.fs"><code>FileStatus</code></a> of a given cache file on hdfs. Internal to |
| MapReduce.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration</dd> |
| <dd><code>cache</code> - cache file</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>FileStatus</code> of a given cache file on hdfs</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> |
| </li> |
| </ul> |
| <a name="getTimestamp-org.apache.hadoop.conf.Configuration-java.net.URI-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTimestamp</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static long getTimestamp(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> cache) |
| 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="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Returns mtime of a given cache file on hdfs. Internal to MapReduce.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration</dd> |
| <dd><code>cache</code> - cache file</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>mtime of a given cache file on hdfs</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> |
| </li> |
| </ul> |
| <a name="setArchiveTimestamps-org.apache.hadoop.conf.Configuration-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setArchiveTimestamps</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void setArchiveTimestamps(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> timestamps)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">This is to check the timestamp of the archives to be localized. |
| Used by internal MapReduce code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - Configuration which stores the timestamp's</dd> |
| <dd><code>timestamps</code> - comma separated list of timestamps of archives. |
| The order should be the same as the order in which the archives are added.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setFileTimestamps-org.apache.hadoop.conf.Configuration-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setFileTimestamps</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void setFileTimestamps(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> timestamps)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">This is to check the timestamp of the files to be localized. |
| Used by internal MapReduce code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - Configuration which stores the timestamp's</dd> |
| <dd><code>timestamps</code> - comma separated list of timestamps of files. |
| The order should be the same as the order in which the files are added.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setLocalArchives-org.apache.hadoop.conf.Configuration-java.lang.String-"> |
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| <h4>setLocalArchives</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void setLocalArchives(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Set the conf to contain the location for localized archives. Used |
| by internal DistributedCache code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The conf to modify to contain the localized caches</dd> |
| <dd><code>str</code> - a comma separated list of local archives</dd> |
| </dl> |
| </li> |
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| <h4>setLocalFiles</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| public static void setLocalFiles(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| <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> str)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| <div class="block">Set the conf to contain the location for localized files. Used |
| by internal DistributedCache code.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The conf to modify to contain the localized caches</dd> |
| <dd><code>str</code> - a comma separated list of local files</dd> |
| </dl> |
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