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| <h5>MapReduce REST APIs</h5> |
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| <h5>YARN</h5> |
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| <h5>YARN REST APIs</h5> |
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| <a href="../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a> |
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| <a href="../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a> |
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| <a href="../hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a> |
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| <a href="../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a> |
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| <h5>YARN Service</h5> |
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| <h5>Hadoop Compatible File Systems</h5> |
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| <h5>Reference</h5> |
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| <a href="../hadoop-project-dist/hadoop-common/core-default.xml">core-default.xml</a> |
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| <a href="../hadoop-project-dist/hadoop-hdfs/hdfs-default.xml">hdfs-default.xml</a> |
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| <a href="../hadoop-project-dist/hadoop-hdfs-rbf/hdfs-rbf-default.xml">hdfs-rbf-default.xml</a> |
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| <a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a> |
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| <a href="../hadoop-yarn/hadoop-yarn-common/yarn-default.xml">yarn-default.xml</a> |
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| <a href="../hadoop-kms/kms-default.html">kms-default.xml</a> |
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| <a href="../hadoop-hdfs-httpfs/httpfs-default.html">httpfs-default.xml</a> |
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| <li class="none"> |
| <a href="../hadoop-project-dist/hadoop-common/DeprecatedProperties.html">Deprecated Properties</a> |
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| --> |
| <h1>Hadoop HDFS over HTTP - Documentation Sets</h1> |
| <p>HttpFS is a server that provides a REST HTTP gateway supporting all HDFS File System operations (read and write). And it is interoperable with the <b>webhdfs</b> REST HTTP API.</p> |
| <p>HttpFS can be used to transfer data between clusters running different versions of Hadoop (overcoming RPC versioning issues), for example using Hadoop DistCP.</p> |
| <p>HttpFS can be used to access data in HDFS on a cluster behind of a firewall (the HttpFS server acts as a gateway and is the only system that is allowed to cross the firewall into the cluster).</p> |
| <p>HttpFS can be used to access data in HDFS using HTTP utilities (such as curl and wget) and HTTP libraries Perl from other languages than Java.</p> |
| <p>The <b>webhdfs</b> client FileSystem implementation can be used to access HttpFS using the Hadoop filesystem command (<tt>hadoop fs</tt>) line tool as well as from Java applications using the Hadoop FileSystem Java API.</p> |
| <p>HttpFS has built-in security supporting Hadoop pseudo authentication and HTTP SPNEGO Kerberos and other pluggable authentication mechanisms. It also provides Hadoop proxy user support.</p> |
| <div class="section"> |
| <h2><a name="How_Does_HttpFS_Works.3F"></a>How Does HttpFS Works?</h2> |
| <p>HttpFS is a separate service from Hadoop NameNode.</p> |
| <p>HttpFS itself is Java Jetty web-application.</p> |
| <p>HttpFS HTTP web-service API calls are HTTP REST calls that map to a HDFS file system operation. For example, using the <tt>curl</tt> Unix command:</p> |
| <ul> |
| |
| <li> |
| |
| <p><tt>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo/README.txt?op=OPEN&user.name=foo'</tt> returns the contents of the HDFS <tt>/user/foo/README.txt</tt> file.</p> |
| </li> |
| <li> |
| |
| <p><tt>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo?op=LISTSTATUS&user.name=foo'</tt> returns the contents of the HDFS <tt>/user/foo</tt> directory in JSON format.</p> |
| </li> |
| <li> |
| |
| <p><tt>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo?op=GETTRASHROOT&user.name=foo'</tt> returns the path <tt>/user/foo/.Trash</tt>, if <tt>/</tt> is an encrypted zone, returns the path <tt>/.Trash/foo</tt>. See <a href="../hadoop-project-dist/hadoop-hdfs/TransparentEncryption.html#Rename_and_Trash_considerations">more details</a> about trash path in an encrypted zone.</p> |
| </li> |
| <li> |
| |
| <p><tt>$ curl -X POST 'http://httpfs-host:14000/webhdfs/v1/user/foo/bar?op=MKDIRS&user.name=foo'</tt> creates the HDFS <tt>/user/foo/bar</tt> directory.</p> |
| </li> |
| </ul></div> |
| <div class="section"> |
| <h2><a name="User_and_Developer_Documentation"></a>User and Developer Documentation</h2> |
| <ul> |
| |
| <li> |
| |
| <p><a href="./ServerSetup.html">HttpFS Server Setup</a></p> |
| </li> |
| <li> |
| |
| <p><a href="./UsingHttpTools.html">Using HTTP Tools</a></p> |
| </li> |
| </ul></div> |
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