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<a href="../hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html">NameNode HA With QJM</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html">Permissions and HDFS</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/LibHdfs.html">libhdfs (C API)</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/ShortCircuitLocalReads.html">Short Circuit Local Reads</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsNfsGateway.html">NFS Gateway</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/TransparentEncryption.html">Transparent Encryption</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsMultihoming.html">Multihoming</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html">Storage Policies</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/MemoryStorage.html">Memory Storage Support</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/SLGUserGuide.html">Synthetic Load Generator</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html">Erasure Coding</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HDFSDiskbalancer.html">Disk Balancer</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsUpgradeDomain.html">Upgrade Domain</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsDataNodeAdminGuide.html">DataNode Admin</a>
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<a href="../hadoop-project-dist/hadoop-hdfs-rbf/HDFSRouterFederation.html">Router Federation</a>
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<a href="../hadoop-project-dist/hadoop-hdfs/HdfsProvidedStorage.html">Provided Storage</a>
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<h5>MapReduce</h5>
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html">Tutorial</a>
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredCommands.html">Commands Reference</a>
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduce_Compatibility_Hadoop1_Hadoop2.html">Compatibility with 1.x</a>
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html">Encrypted Shuffle</a>
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<li class="none">
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/PluggableShuffleAndPluggableSort.html">Pluggable Shuffle/Sort</a>
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html">Distributed Cache Deploy</a>
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<li class="none">
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/SharedCacheSupport.html">Support for YARN Shared Cache</a>
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</ul>
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<h5>MapReduce REST APIs</h5>
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<ul>
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<li class="none">
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a>
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<li class="none">
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<a href="../hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html">MR History Server</a>
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</ul>
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<h5>YARN</h5>
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<ul>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/YarnCommands.html">Commands Reference</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html">Capacity Scheduler</a>
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<a href="../hadoop-yarn/hadoop-yarn-site/FairScheduler.html">Fair Scheduler</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/ResourceManagerRestart.html">ResourceManager Restart</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html">YARN Application Security</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a>
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</li>
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</ul>
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<h5>YARN REST APIs</h5>
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<ul>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a>
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</li>
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<li class="none">
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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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</li>
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<li class="none">
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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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</li>
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</ul>
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<h5>YARN Service</h5>
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<ul>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a>
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</li>
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<li class="none">
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<a href="../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a>
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</li>
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</ul>
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<h5>Hadoop Compatible File Systems</h5>
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<ul>
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<li class="none">
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<a href="../hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a>
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</li>
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<li class="none">
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<a href="../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a>
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</li>
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<li class="none">
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<a href="../hadoop-azure/index.html">Azure Blob Storage</a>
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</li>
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<li class="none">
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<a href="../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a>
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</li>
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<li class="none">
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<a href="../hadoop-cos/cloud-storage/index.html">Tencent COS</a>
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</li>
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<li class="none">
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<a href="../hadoop-huaweicloud/cloud-storage/index.html">Huaweicloud OBS</a>
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</li>
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</ul>
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<h5>Auth</h5>
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<a href="../hadoop-auth/index.html">Overview</a>
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<h5>Tools</h5>
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<h1>Hadoop HDFS over HTTP - Documentation Sets</h1>
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|
<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>
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|
<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>
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<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>
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<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>
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|
<p>The <b>webhdfs</b> client FileSystem implementation can be used to access HttpFS using the Hadoop filesystem command (<code>hadoop fs</code>) 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><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 <code>curl</code> Unix command:</p>
|
|
<ul>
|
|
|
|
<li>
|
|
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|
<p><code>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo/README.txt?op=OPEN&user.name=foo'</code> returns the contents of the HDFS <code>/user/foo/README.txt</code> file.</p>
|
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</li>
|
|
<li>
|
|
|
|
<p><code>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo?op=LISTSTATUS&user.name=foo'</code> returns the contents of the HDFS <code>/user/foo</code> directory in JSON format.</p>
|
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</li>
|
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<li>
|
|
|
|
<p><code>$ curl 'http://httpfs-host:14000/webhdfs/v1/user/foo?op=GETTRASHROOT&user.name=foo'</code> returns the path <code>/user/foo/.Trash</code>, if <code>/</code> is an encrypted zone, returns the path <code>/.Trash/foo</code>. 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><code>$ curl -X PUT 'http://httpfs-host:14000/webhdfs/v1/user/foo/bar?op=MKDIRS&user.name=foo'</code> creates the HDFS <code>/user/foo/bar</code> directory.</p>
|
|
</li>
|
|
</ul></section><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>
|
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<li>
|
|
|
|
<p><a href="./UsingHttpTools.html">Using HTTP Tools</a></p>
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</li>
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</ul></section>
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