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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/ArchivalStorage.html">Storage Policies</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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| <li class="none"> |
| <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> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/PluggableShuffleAndPluggableSort.html">Pluggable Shuffle/Sort</a> |
| </li> |
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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html">Distributed Cache Deploy</a> |
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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/SharedCacheSupport.html">Support for YARN Shared Cache</a> |
| </li> |
| </ul> |
| <h5>MapReduce REST APIs</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a> |
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| <li class="none"> |
| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html">MR History Server</a> |
| </li> |
| </ul> |
| <h5>YARN</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/YarnCommands.html">Commands Reference</a> |
| </li> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html">Capacity Scheduler</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/FairScheduler.html">Fair Scheduler</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRestart.html">ResourceManager Restart</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html">YARN Application Security</a> |
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| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a> |
| </li> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a> |
| </li> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a> |
| </li> |
| </ul> |
| <h5>YARN REST APIs</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a> |
| </li> |
| </ul> |
| <h5>YARN Service</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a> |
| </li> |
| </ul> |
| <h5>Hadoop Compatible File Systems</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-azure/index.html">Azure Blob Storage</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-openstack/index.html">OpenStack Swift</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-cos/cloud-storage/index.html">Tencent COS</a> |
| </li> |
| </ul> |
| <h5>Auth</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-auth/index.html">Overview</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-auth/Examples.html">Examples</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-auth/Configuration.html">Configuration</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-auth/BuildingIt.html">Building</a> |
| </li> |
| </ul> |
| <h5>Tools</h5> |
| <ul> |
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| <a href="../../hadoop-streaming/HadoopStreaming.html">Hadoop Streaming</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-archives/HadoopArchives.html">Hadoop Archives</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-archive-logs/HadoopArchiveLogs.html">Hadoop Archive Logs</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-distcp/DistCp.html">DistCp</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-gridmix/GridMix.html">GridMix</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-rumen/Rumen.html">Rumen</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-resourceestimator/ResourceEstimator.html">Resource Estimator Service</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-sls/SchedulerLoadSimulator.html">Scheduler Load Simulator</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/Benchmarking.html">Hadoop Benchmarking</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-dynamometer/Dynamometer.html">Dynamometer</a> |
| </li> |
| </ul> |
| <h5>Reference</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/release/">Changelog and Release Notes</a> |
| </li> |
| <li class="none"> |
| <a href="../../api/index.html">Java API docs</a> |
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| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/UnixShellAPI.html">Unix Shell API</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/Metrics.html">Metrics</a> |
| </li> |
| </ul> |
| <h5>Configuration</h5> |
| <ul> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/core-default.xml">core-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-hdfs/hdfs-default.xml">hdfs-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-hdfs-rbf/hdfs-rbf-default.xml">hdfs-rbf-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-common/yarn-default.xml">yarn-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-kms/kms-default.html">kms-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-hdfs-httpfs/httpfs-default.html">httpfs-default.xml</a> |
| </li> |
| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/DeprecatedProperties.html">Deprecated Properties</a> |
| </li> |
| </ul> |
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| --> |
| <h1>Native Libraries Guide</h1> |
| <ul> |
| <li><a href="#Overview">Overview</a></li> |
| <li><a href="#Native_Hadoop_Library">Native Hadoop Library</a></li> |
| <li><a href="#Usage">Usage</a></li> |
| <li><a href="#Components">Components</a></li> |
| <li><a href="#Supported_Platforms">Supported Platforms</a></li> |
| <li><a href="#Download">Download</a></li> |
| <li><a href="#Build">Build</a></li> |
| <li><a href="#Runtime">Runtime</a></li> |
| <li><a href="#Check">Check</a></li> |
| <li><a href="#Native_Shared_Libraries">Native Shared Libraries</a></li></ul> |
| |
| <div class="section"> |
| <h2><a name="Overview"></a>Overview</h2> |
| <p>This guide describes the native hadoop library and includes a small discussion about native shared libraries.</p> |
| <p>Note: Depending on your environment, the term “native libraries” could refer to all *.so’s you need to compile; and, the term “native compression” could refer to all *.so’s you need to compile that are specifically related to compression. Currently, however, this document only addresses the native hadoop library (<tt>libhadoop.so</tt>). The document for libhdfs library (<tt>libhdfs.so</tt>) is <a href="../hadoop-hdfs/LibHdfs.html">here</a>.</p></div> |
| <div class="section"> |
| <h2><a name="Native_Hadoop_Library"></a>Native Hadoop Library</h2> |
| <p>Hadoop has native implementations of certain components for performance reasons and for non-availability of Java implementations. These components are available in a single, dynamically-linked native library called the native hadoop library. On the *nix platforms the library is named <tt>libhadoop.so</tt>.</p></div> |
| <div class="section"> |
| <h2><a name="Usage"></a>Usage</h2> |
| <p>It is fairly easy to use the native hadoop library:</p> |
| <ol style="list-style-type: decimal"> |
| |
| <li>Review the components.</li> |
| <li>Review the supported platforms.</li> |
| <li>Either download a hadoop release, which will include a pre-built version of the native hadoop library, or build your own version of the native hadoop library. Whether you download or build, the name for the library is the same: libhadoop.so</li> |
| <li>Install the compression codec development packages (>zlib-1.2, >gzip-1.2): |
| <ul> |
| |
| <li>If you download the library, install one or more development packages - whichever compression codecs you want to use with your deployment.</li> |
| <li>If you build the library, it is mandatory to install both development packages.</li> |
| </ul> |
| </li> |
| <li>Check the runtime log files.</li> |
| </ol></div> |
| <div class="section"> |
| <h2><a name="Components"></a>Components</h2> |
| <p>The native hadoop library includes various components:</p> |
| <ul> |
| |
| <li>Compression Codecs (bzip2, lz4, zlib)</li> |
| <li>Native IO utilities for <a href="../hadoop-hdfs/ShortCircuitLocalReads.html">HDFS Short-Circuit Local Reads</a> and <a href="../hadoop-hdfs/CentralizedCacheManagement.html">Centralized Cache Management in HDFS</a></li> |
| <li>CRC32 checksum implementation</li> |
| </ul></div> |
| <div class="section"> |
| <h2><a name="Supported_Platforms"></a>Supported Platforms</h2> |
| <p>The native hadoop library is supported on *nix platforms only. The library does not to work with Cygwin or the Mac OS X platform.</p> |
| <p>The native hadoop library is mainly used on the GNU/Linus platform and has been tested on these distributions:</p> |
| <ul> |
| |
| <li>RHEL4/Fedora</li> |
| <li>Ubuntu</li> |
| <li>Gentoo</li> |
| </ul> |
| <p>On all the above distributions a 32/64 bit native hadoop library will work with a respective 32/64 bit jvm.</p></div> |
| <div class="section"> |
| <h2><a name="Download"></a>Download</h2> |
| <p>The pre-built 32-bit i386-Linux native hadoop library is available as part of the hadoop distribution and is located in the <tt>lib/native</tt> directory. You can download the hadoop distribution from Hadoop Common Releases.</p> |
| <p>Be sure to install the zlib and/or gzip development packages - whichever compression codecs you want to use with your deployment.</p></div> |
| <div class="section"> |
| <h2><a name="Build"></a>Build</h2> |
| <p>The native hadoop library is written in ANSI C and is built using the GNU autotools-chain (autoconf, autoheader, automake, autoscan, libtool). This means it should be straight-forward to build the library on any platform with a standards-compliant C compiler and the GNU autotools-chain (see the supported platforms).</p> |
| <p>The packages you need to install on the target platform are:</p> |
| <ul> |
| |
| <li>C compiler (e.g. GNU C Compiler)</li> |
| <li>GNU Autools Chain: autoconf, automake, libtool</li> |
| <li>zlib-development package (stable version >= 1.2.0)</li> |
| <li>openssl-development package(e.g. libssl-dev)</li> |
| </ul> |
| <p>Once you installed the prerequisite packages use the standard hadoop pom.xml file and pass along the native flag to build the native hadoop library:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> $ mvn package -Pdist,native -DskipTests -Dtar |
| </pre></div></div> |
| |
| <p>You should see the newly-built library in:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> $ hadoop-dist/target/hadoop-3.3.1/lib/native |
| </pre></div></div> |
| |
| <p>Please note the following:</p> |
| <ul> |
| |
| <li>It is mandatory to install both the zlib and gzip development packages on the target platform in order to build the native hadoop library; however, for deployment it is sufficient to install just one package if you wish to use only one codec.</li> |
| <li>It is necessary to have the correct 32/64 libraries for zlib, depending on the 32/64 bit jvm for the target platform, in order to build and deploy the native hadoop library.</li> |
| </ul></div> |
| <div class="section"> |
| <h2><a name="Runtime"></a>Runtime</h2> |
| <p>The bin/hadoop script ensures that the native hadoop library is on the library path via the system property: <tt>-Djava.library.path=<path></tt></p> |
| <p>During runtime, check the hadoop log files for your MapReduce tasks.</p> |
| <ul> |
| |
| <li>If everything is all right, then: <tt>DEBUG util.NativeCodeLoader - Trying to load the custom-built native-hadoop library...</tt> <tt>INFO util.NativeCodeLoader - Loaded the native-hadoop library</tt></li> |
| <li>If something goes wrong, then: <tt>INFO util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable</tt></li> |
| </ul></div> |
| <div class="section"> |
| <h2><a name="Check"></a>Check</h2> |
| <p>NativeLibraryChecker is a tool to check whether native libraries are loaded correctly. You can launch NativeLibraryChecker as follows:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> $ hadoop checknative -a |
| 14/12/06 01:30:45 WARN bzip2.Bzip2Factory: Failed to load/initialize native-bzip2 library system-native, will use pure-Java version |
| 14/12/06 01:30:45 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library |
| Native library checking: |
| hadoop: true /home/ozawa/hadoop/lib/native/libhadoop.so.1.0.0 |
| zlib: true /lib/x86_64-linux-gnu/libz.so.1 |
| zstd: true /usr/lib/libzstd.so.1 |
| lz4: true revision:99 |
| bzip2: false |
| </pre></div></div> |
| </div> |
| <div class="section"> |
| <h2><a name="Native_Shared_Libraries"></a>Native Shared Libraries</h2> |
| <p>You can load any native shared library using DistributedCache for distributing and symlinking the library files.</p> |
| <p>This example shows you how to distribute a shared library, mylib.so, and load it from a MapReduce task.</p> |
| <ol style="list-style-type: decimal"> |
| |
| <li>First copy the library to the HDFS: <tt>bin/hadoop fs -copyFromLocal mylib.so.1 /libraries/mylib.so.1</tt></li> |
| <li>The job launching program should contain the following: <tt>DistributedCache.createSymlink(conf);</tt> <tt>DistributedCache.addCacheFile("hdfs://host:port/libraries/mylib.so. 1#mylib.so", conf);</tt></li> |
| <li>The MapReduce task can contain: <tt>System.loadLibrary("mylib.so");</tt></li> |
| </ol> |
| <p>Note: If you downloaded or built the native hadoop library, you don’t need to use DistibutedCache to make the library available to your MapReduce tasks.</p></div> |
| </div> |
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