Home Explore Help
Register Sign In
apache
/
hadoop
mirror of https://github.com/apache/hadoop.git
2
0
Fork 1
Files Issues 0 Wiki
Branch: gh-pages
Branches Tags
hadoop
/
index.html

index.html 33 KB
Permalink History Raw

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    2. 

  2. <!--
    3. 

  3.  | Generated by Apache Maven Doxia at 2025-05-02
    4. 

  4.  | Rendered using Apache Maven Stylus Skin 1.5
    5. 

  5. -->
    6. 

  6. <html xmlns="http://www.w3.org/1999/xhtml">
    7. 

  7.   <head>
    8. 

  8.     <title>Hadoop &#x2013; Apache Hadoop 3.5.0-SNAPSHOT</title>
    9. 

  9.     <style type="text/css" media="all">
    10. 

  10.       @import url("./css/maven-base.css");
    11. 

  11.       @import url("./css/maven-theme.css");
    12. 

  12.       @import url("./css/site.css");
    13. 

  13.     </style>
    14. 

  14.     <link rel="stylesheet" href="./css/print.css" type="text/css" media="print" />
    15. 

  15.         <meta name="Date-Revision-yyyymmdd" content="20250502" />
    16. 

  16.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    17. 

  17.                 </head>
    18. 

  18.   <body class="composite">
    19. 

  19.     <div id="banner">
    20. 

  20.                         <a href="http://hadoop.apache.org/" id="bannerLeft">
    21. 

  21.                                         <img src="http://hadoop.apache.org/images/hadoop-logo.jpg" alt="" />
    22. 

  22.                 </a>
    23. 

  23.                               <a href="http://www.apache.org/" id="bannerRight">
    24. 

  24.                                         <img src="http://www.apache.org/images/asf_logo_wide.png" alt="" />
    25. 

  25.                 </a>
    26. 

  26.             <div class="clear">
    27. 

  27.         <hr/>
    28. 

  28.       </div>
    29. 

  29.     </div>
    30. 

  30.     <div id="breadcrumbs">
    31. 

  31.             
    32. 

  32.                                      <div class="xright">            <a href="http://wiki.apache.org/hadoop" class="externalLink">Wiki</a>
    33. 

  33.             |
    34. 

  34.                 <a href="https://gitbox.apache.org/repos/asf/hadoop.git" class="externalLink">git</a>
    35. 

  35.               
    36. 

  36.                                    &nbsp;| Last Published: 2025-05-02
    37. 

  37.               &nbsp;| Version: 3.5.0-SNAPSHOT
    38. 

  38.             </div>
    39. 

  39.       <div class="clear">
    40. 

  40.         <hr/>
    41. 

  41.       </div>
    42. 

  42.     </div>
    43. 

  43.     <div id="leftColumn">
    44. 

  44.       <div id="navcolumn">
    45. 

  45.              
    46. 

  46.                                                    <h5>General</h5>
    47. 

  47.                   <ul>
    48. 

  48.                   <li class="none">
    49. 

  49.             <strong>Overview</strong>
    50. 

  50.           </li>
    51. 

  51.                   <li class="none">
    52. 

  52.                   <a href="hadoop-project-dist/hadoop-common/SingleCluster.html">Single Node Setup</a>
    53. 

  53.             </li>
    54. 

  54.                   <li class="none">
    55. 

  55.                   <a href="hadoop-project-dist/hadoop-common/ClusterSetup.html">Cluster Setup</a>
    56. 

  56.             </li>
    57. 

  57.                   <li class="none">
    58. 

  58.                   <a href="hadoop-project-dist/hadoop-common/CommandsManual.html">Commands Reference</a>
    59. 

  59.             </li>
    60. 

  60.                   <li class="none">
    61. 

  61.                   <a href="hadoop-project-dist/hadoop-common/FileSystemShell.html">FileSystem Shell</a>
    62. 

  62.             </li>
    63. 

  63.                   <li class="none">
    64. 

  64.                   <a href="hadoop-project-dist/hadoop-common/Compatibility.html">Compatibility Specification</a>
    65. 

  65.             </li>
    66. 

  66.                   <li class="none">
    67. 

  67.                   <a href="hadoop-project-dist/hadoop-common/DownstreamDev.html">Downstream Developer's Guide</a>
    68. 

  68.             </li>
    69. 

  69.                   <li class="none">
    70. 

  70.                   <a href="hadoop-project-dist/hadoop-common/AdminCompatibilityGuide.html">Admin Compatibility Guide</a>
    71. 

  71.             </li>
    72. 

  72.                   <li class="none">
    73. 

  73.                   <a href="hadoop-project-dist/hadoop-common/InterfaceClassification.html">Interface Classification</a>
    74. 

  74.             </li>
    75. 

  75.                   <li class="none">
    76. 

  76.                   <a href="hadoop-project-dist/hadoop-common/filesystem/index.html">FileSystem Specification</a>
    77. 

  77.             </li>
    78. 

  78.           </ul>
    79. 

  79.                        <h5>Common</h5>
    80. 

  80.                   <ul>
    81. 

  81.                   <li class="none">
    82. 

  82.                   <a href="hadoop-project-dist/hadoop-common/CLIMiniCluster.html">CLI Mini Cluster</a>
    83. 

  83.             </li>
    84. 

  84.                   <li class="none">
    85. 

  85.                   <a href="hadoop-project-dist/hadoop-common/FairCallQueue.html">Fair Call Queue</a>
    86. 

  86.             </li>
    87. 

  87.                   <li class="none">
    88. 

  88.                   <a href="hadoop-project-dist/hadoop-common/NativeLibraries.html">Native Libraries</a>
    89. 

  89.             </li>
    90. 

  90.                   <li class="none">
    91. 

  91.                   <a href="hadoop-project-dist/hadoop-common/Superusers.html">Proxy User</a>
    92. 

  92.             </li>
    93. 

  93.                   <li class="none">
    94. 

  94.                   <a href="hadoop-project-dist/hadoop-common/RackAwareness.html">Rack Awareness</a>
    95. 

  95.             </li>
    96. 

  96.                   <li class="none">
    97. 

  97.                   <a href="hadoop-project-dist/hadoop-common/SecureMode.html">Secure Mode</a>
    98. 

  98.             </li>
    99. 

  99.                   <li class="none">
    100. 

  100.                   <a href="hadoop-project-dist/hadoop-common/ServiceLevelAuth.html">Service Level Authorization</a>
    101. 

  101.             </li>
    102. 

  102.                   <li class="none">
    103. 

  103.                   <a href="hadoop-project-dist/hadoop-common/HttpAuthentication.html">HTTP Authentication</a>
    104. 

  104.             </li>
    105. 

  105.                   <li class="none">
    106. 

  106.                   <a href="hadoop-project-dist/hadoop-common/CredentialProviderAPI.html">Credential Provider API</a>
    107. 

  107.             </li>
    108. 

  108.                   <li class="none">
    109. 

  109.                   <a href="hadoop-kms/index.html">Hadoop KMS</a>
    110. 

  110.             </li>
    111. 

  111.                   <li class="none">
    112. 

  112.                   <a href="hadoop-project-dist/hadoop-common/Tracing.html">Tracing</a>
    113. 

  113.             </li>
    114. 

  114.                   <li class="none">
    115. 

  115.                   <a href="hadoop-project-dist/hadoop-common/UnixShellGuide.html">Unix Shell Guide</a>
    116. 

  116.             </li>
    117. 

  117.                   <li class="none">
    118. 

  118.                   <a href="hadoop-project-dist/hadoop-common/registry/index.html">Registry</a>
    119. 

  119.             </li>
    120. 

  120.                   <li class="none">
    121. 

  121.                   <a href="hadoop-project-dist/hadoop-common/AsyncProfilerServlet.html">Async Profiler</a>
    122. 

  122.             </li>
    123. 

  123.           </ul>
    124. 

  124.                        <h5>HDFS</h5>
    125. 

  125.                   <ul>
    126. 

  126.                   <li class="none">
    127. 

  127.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsDesign.html">Architecture</a>
    128. 

  128.             </li>
    129. 

  129.                   <li class="none">
    130. 

  130.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsUserGuide.html">User Guide</a>
    131. 

  131.             </li>
    132. 

  132.                   <li class="none">
    133. 

  133.                   <a href="hadoop-project-dist/hadoop-hdfs/HDFSCommands.html">Commands Reference</a>
    134. 

  134.             </li>
    135. 

  135.                   <li class="none">
    136. 

  136.                   <a href="hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html">NameNode HA With QJM</a>
    137. 

  137.             </li>
    138. 

  138.                   <li class="none">
    139. 

  139.                   <a href="hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithNFS.html">NameNode HA With NFS</a>
    140. 

  140.             </li>
    141. 

  141.                   <li class="none">
    142. 

  142.                   <a href="hadoop-project-dist/hadoop-hdfs/ObserverNameNode.html">Observer NameNode</a>
    143. 

  143.             </li>
    144. 

  144.                   <li class="none">
    145. 

  145.                   <a href="hadoop-project-dist/hadoop-hdfs/Federation.html">Federation</a>
    146. 

  146.             </li>
    147. 

  147.                   <li class="none">
    148. 

  148.                   <a href="hadoop-project-dist/hadoop-hdfs/ViewFs.html">ViewFs</a>
    149. 

  149.             </li>
    150. 

  150.                   <li class="none">
    151. 

  151.                   <a href="hadoop-project-dist/hadoop-hdfs/ViewFsOverloadScheme.html">ViewFsOverloadScheme</a>
    152. 

  152.             </li>
    153. 

  153.                   <li class="none">
    154. 

  154.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html">Snapshots</a>
    155. 

  155.             </li>
    156. 

  156.                   <li class="none">
    157. 

  157.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsEditsViewer.html">Edits Viewer</a>
    158. 

  158.             </li>
    159. 

  159.                   <li class="none">
    160. 

  160.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsImageViewer.html">Image Viewer</a>
    161. 

  161.             </li>
    162. 

  162.                   <li class="none">
    163. 

  163.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html">Permissions and HDFS</a>
    164. 

  164.             </li>
    165. 

  165.                   <li class="none">
    166. 

  166.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsQuotaAdminGuide.html">Quotas and HDFS</a>
    167. 

  167.             </li>
    168. 

  168.                   <li class="none">
    169. 

  169.                   <a href="hadoop-project-dist/hadoop-hdfs/LibHdfs.html">libhdfs (C API)</a>
    170. 

  170.             </li>
    171. 

  171.                   <li class="none">
    172. 

  172.                   <a href="hadoop-project-dist/hadoop-hdfs/WebHDFS.html">WebHDFS (REST API)</a>
    173. 

  173.             </li>
    174. 

  174.                   <li class="none">
    175. 

  175.                   <a href="hadoop-hdfs-httpfs/index.html">HttpFS</a>
    176. 

  176.             </li>
    177. 

  177.                   <li class="none">
    178. 

  178.                   <a href="hadoop-project-dist/hadoop-hdfs/ShortCircuitLocalReads.html">Short Circuit Local Reads</a>
    179. 

  179.             </li>
    180. 

  180.                   <li class="none">
    181. 

  181.                   <a href="hadoop-project-dist/hadoop-hdfs/CentralizedCacheManagement.html">Centralized Cache Management</a>
    182. 

  182.             </li>
    183. 

  183.                   <li class="none">
    184. 

  184.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsNfsGateway.html">NFS Gateway</a>
    185. 

  185.             </li>
    186. 

  186.                   <li class="none">
    187. 

  187.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html">Rolling Upgrade</a>
    188. 

  188.             </li>
    189. 

  189.                   <li class="none">
    190. 

  190.                   <a href="hadoop-project-dist/hadoop-hdfs/ExtendedAttributes.html">Extended Attributes</a>
    191. 

  191.             </li>
    192. 

  192.                   <li class="none">
    193. 

  193.                   <a href="hadoop-project-dist/hadoop-hdfs/TransparentEncryption.html">Transparent Encryption</a>
    194. 

  194.             </li>
    195. 

  195.                   <li class="none">
    196. 

  196.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsMultihoming.html">Multihoming</a>
    197. 

  197.             </li>
    198. 

  198.                   <li class="none">
    199. 

  199.                   <a href="hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html">Storage Policies</a>
    200. 

  200.             </li>
    201. 

  201.                   <li class="none">
    202. 

  202.                   <a href="hadoop-project-dist/hadoop-hdfs/MemoryStorage.html">Memory Storage Support</a>
    203. 

  203.             </li>
    204. 

  204.                   <li class="none">
    205. 

  205.                   <a href="hadoop-project-dist/hadoop-hdfs/SLGUserGuide.html">Synthetic Load Generator</a>
    206. 

  206.             </li>
    207. 

  207.                   <li class="none">
    208. 

  208.                   <a href="hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html">Erasure Coding</a>
    209. 

  209.             </li>
    210. 

  210.                   <li class="none">
    211. 

  211.                   <a href="hadoop-project-dist/hadoop-hdfs/HDFSDiskbalancer.html">Disk Balancer</a>
    212. 

  212.             </li>
    213. 

  213.                   <li class="none">
    214. 

  214.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsUpgradeDomain.html">Upgrade Domain</a>
    215. 

  215.             </li>
    216. 

  216.                   <li class="none">
    217. 

  217.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsDataNodeAdminGuide.html">DataNode Admin</a>
    218. 

  218.             </li>
    219. 

  219.                   <li class="none">
    220. 

  220.                   <a href="hadoop-project-dist/hadoop-hdfs-rbf/HDFSRouterFederation.html">Router Federation</a>
    221. 

  221.             </li>
    222. 

  222.                   <li class="none">
    223. 

  223.                   <a href="hadoop-project-dist/hadoop-hdfs/HdfsProvidedStorage.html">Provided Storage</a>
    224. 

  224.             </li>
    225. 

  225.           </ul>
    226. 

  226.                        <h5>MapReduce</h5>
    227. 

  227.                   <ul>
    228. 

  228.                   <li class="none">
    229. 

  229.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html">Tutorial</a>
    230. 

  230.             </li>
    231. 

  231.                   <li class="none">
    232. 

  232.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredCommands.html">Commands Reference</a>
    233. 

  233.             </li>
    234. 

  234.                   <li class="none">
    235. 

  235.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduce_Compatibility_Hadoop1_Hadoop2.html">Compatibility with 1.x</a>
    236. 

  236.             </li>
    237. 

  237.                   <li class="none">
    238. 

  238.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html">Encrypted Shuffle</a>
    239. 

  239.             </li>
    240. 

  240.                   <li class="none">
    241. 

  241.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/PluggableShuffleAndPluggableSort.html">Pluggable Shuffle/Sort</a>
    242. 

  242.             </li>
    243. 

  243.                   <li class="none">
    244. 

  244.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html">Distributed Cache Deploy</a>
    245. 

  245.             </li>
    246. 

  246.                   <li class="none">
    247. 

  247.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/SharedCacheSupport.html">Support for YARN Shared Cache</a>
    248. 

  248.             </li>
    249. 

  249.           </ul>
    250. 

  250.                        <h5>MapReduce REST APIs</h5>
    251. 

  251.                   <ul>
    252. 

  252.                   <li class="none">
    253. 

  253.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a>
    254. 

  254.             </li>
    255. 

  255.                   <li class="none">
    256. 

  256.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html">MR History Server</a>
    257. 

  257.             </li>
    258. 

  258.           </ul>
    259. 

  259.                        <h5>YARN</h5>
    260. 

  260.                   <ul>
    261. 

  261.                   <li class="none">
    262. 

  262.                   <a href="hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a>
    263. 

  263.             </li>
    264. 

  264.                   <li class="none">
    265. 

  265.                   <a href="hadoop-yarn/hadoop-yarn-site/YarnCommands.html">Commands Reference</a>
    266. 

  266.             </li>
    267. 

  267.                   <li class="none">
    268. 

  268.                   <a href="hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html">Capacity Scheduler</a>
    269. 

  269.             </li>
    270. 

  270.                   <li class="none">
    271. 

  271.                   <a href="hadoop-yarn/hadoop-yarn-site/FairScheduler.html">Fair Scheduler</a>
    272. 

  272.             </li>
    273. 

  273.                   <li class="none">
    274. 

  274.                   <a href="hadoop-yarn/hadoop-yarn-site/ResourceManagerRestart.html">ResourceManager Restart</a>
    275. 

  275.             </li>
    276. 

  276.                   <li class="none">
    277. 

  277.                   <a href="hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a>
    278. 

  278.             </li>
    279. 

  279.                   <li class="none">
    280. 

  280.                   <a href="hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a>
    281. 

  281.             </li>
    282. 

  282.                   <li class="none">
    283. 

  283.                   <a href="hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a>
    284. 

  284.             </li>
    285. 

  285.                   <li class="none">
    286. 

  286.                   <a href="hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a>
    287. 

  287.             </li>
    288. 

  288.                   <li class="none">
    289. 

  289.                   <a href="hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a>
    290. 

  290.             </li>
    291. 

  291.                   <li class="none">
    292. 

  292.                   <a href="hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a>
    293. 

  293.             </li>
    294. 

  294.                   <li class="none">
    295. 

  295.                   <a href="hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a>
    296. 

  296.             </li>
    297. 

  297.                   <li class="none">
    298. 

  298.                   <a href="hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a>
    299. 

  299.             </li>
    300. 

  300.                   <li class="none">
    301. 

  301.                   <a href="hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html">YARN Application Security</a>
    302. 

  302.             </li>
    303. 

  303.                   <li class="none">
    304. 

  304.                   <a href="hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a>
    305. 

  305.             </li>
    306. 

  306.                   <li class="none">
    307. 

  307.                   <a href="hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
    308. 

  308.             </li>
    309. 

  309.                   <li class="none">
    310. 

  310.                   <a href="hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
    311. 

  311.             </li>
    312. 

  312.                   <li class="none">
    313. 

  313.                   <a href="hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a>
    314. 

  314.             </li>
    315. 

  315.                   <li class="none">
    316. 

  316.                   <a href="hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a>
    317. 

  317.             </li>
    318. 

  318.                   <li class="none">
    319. 

  319.                   <a href="hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a>
    320. 

  320.             </li>
    321. 

  321.                   <li class="none">
    322. 

  322.                   <a href="hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a>
    323. 

  323.             </li>
    324. 

  324.                   <li class="none">
    325. 

  325.                   <a href="hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a>
    326. 

  326.             </li>
    327. 

  327.                   <li class="none">
    328. 

  328.                   <a href="hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a>
    329. 

  329.             </li>
    330. 

  330.                   <li class="none">
    331. 

  331.                   <a href="hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a>
    332. 

  332.             </li>
    333. 

  333.                   <li class="none">
    334. 

  334.                   <a href="hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a>
    335. 

  335.             </li>
    336. 

  336.                   <li class="none">
    337. 

  337.                   <a href="hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a>
    338. 

  338.             </li>
    339. 

  339.                   <li class="none">
    340. 

  340.                   <a href="hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a>
    341. 

  341.             </li>
    342. 

  342.                   <li class="none">
    343. 

  343.                   <a href="hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a>
    344. 

  344.             </li>
    345. 

  345.           </ul>
    346. 

  346.                        <h5>YARN REST APIs</h5>
    347. 

  347.                   <ul>
    348. 

  348.                   <li class="none">
    349. 

  349.                   <a href="hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a>
    350. 

  350.             </li>
    351. 

  351.                   <li class="none">
    352. 

  352.                   <a href="hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a>
    353. 

  353.             </li>
    354. 

  354.                   <li class="none">
    355. 

  355.                   <a href="hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a>
    356. 

  356.             </li>
    357. 

  357.                   <li class="none">
    358. 

  358.                   <a href="hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a>
    359. 

  359.             </li>
    360. 

  360.                   <li class="none">
    361. 

  361.                   <a href="hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a>
    362. 

  362.             </li>
    363. 

  363.           </ul>
    364. 

  364.                        <h5>YARN Service</h5>
    365. 

  365.                   <ul>
    366. 

  366.                   <li class="none">
    367. 

  367.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a>
    368. 

  368.             </li>
    369. 

  369.                   <li class="none">
    370. 

  370.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a>
    371. 

  371.             </li>
    372. 

  372.                   <li class="none">
    373. 

  373.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a>
    374. 

  374.             </li>
    375. 

  375.                   <li class="none">
    376. 

  376.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a>
    377. 

  377.             </li>
    378. 

  378.                   <li class="none">
    379. 

  379.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a>
    380. 

  380.             </li>
    381. 

  381.                   <li class="none">
    382. 

  382.                   <a href="hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a>
    383. 

  383.             </li>
    384. 

  384.           </ul>
    385. 

  385.                        <h5>Hadoop Compatible File Systems</h5>
    386. 

  386.                   <ul>
    387. 

  387.                   <li class="none">
    388. 

  388.                   <a href="hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a>
    389. 

  389.             </li>
    390. 

  390.                   <li class="none">
    391. 

  391.                   <a href="hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a>
    392. 

  392.             </li>
    393. 

  393.                   <li class="none">
    394. 

  394.                   <a href="hadoop-azure/index.html">Azure Blob Storage</a>
    395. 

  395.             </li>
    396. 

  396.                   <li class="none">
    397. 

  397.                   <a href="hadoop-azure-datalake/index.html">Azure Data Lake Storage</a>
    398. 

  398.             </li>
    399. 

  399.                   <li class="none">
    400. 

  400.                   <a href="hadoop-cos/cloud-storage/index.html">Tencent COS</a>
    401. 

  401.             </li>
    402. 

  402.                   <li class="none">
    403. 

  403.                   <a href="hadoop-huaweicloud/index.html">Huaweicloud OBS</a>
    404. 

  404.             </li>
    405. 

  405.                   <li class="none">
    406. 

  406.                   <a href="hadoop-tos/cloud-storage/index.html">VolcanoEngine TOS</a>
    407. 

  407.             </li>
    408. 

  408.           </ul>
    409. 

  409.                        <h5>Auth</h5>
    410. 

  410.                   <ul>
    411. 

  411.                   <li class="none">
    412. 

  412.                   <a href="hadoop-auth/index.html">Overview</a>
    413. 

  413.             </li>
    414. 

  414.                   <li class="none">
    415. 

  415.                   <a href="hadoop-auth/Examples.html">Examples</a>
    416. 

  416.             </li>
    417. 

  417.                   <li class="none">
    418. 

  418.                   <a href="hadoop-auth/Configuration.html">Configuration</a>
    419. 

  419.             </li>
    420. 

  420.                   <li class="none">
    421. 

  421.                   <a href="hadoop-auth/BuildingIt.html">Building</a>
    422. 

  422.             </li>
    423. 

  423.           </ul>
    424. 

  424.                        <h5>Tools</h5>
    425. 

  425.                   <ul>
    426. 

  426.                   <li class="none">
    427. 

  427.                   <a href="hadoop-streaming/HadoopStreaming.html">Hadoop Streaming</a>
    428. 

  428.             </li>
    429. 

  429.                   <li class="none">
    430. 

  430.                   <a href="hadoop-archives/HadoopArchives.html">Hadoop Archives</a>
    431. 

  431.             </li>
    432. 

  432.                   <li class="none">
    433. 

  433.                   <a href="hadoop-archive-logs/HadoopArchiveLogs.html">Hadoop Archive Logs</a>
    434. 

  434.             </li>
    435. 

  435.                   <li class="none">
    436. 

  436.                   <a href="hadoop-distcp/DistCp.html">DistCp</a>
    437. 

  437.             </li>
    438. 

  438.                   <li class="none">
    439. 

  439.                   <a href="hadoop-federation-balance/HDFSFederationBalance.html">HDFS Federation Balance</a>
    440. 

  440.             </li>
    441. 

  441.                   <li class="none">
    442. 

  442.                   <a href="hadoop-gridmix/GridMix.html">GridMix</a>
    443. 

  443.             </li>
    444. 

  444.                   <li class="none">
    445. 

  445.                   <a href="hadoop-rumen/Rumen.html">Rumen</a>
    446. 

  446.             </li>
    447. 

  447.                   <li class="none">
    448. 

  448.                   <a href="hadoop-resourceestimator/ResourceEstimator.html">Resource Estimator Service</a>
    449. 

  449.             </li>
    450. 

  450.                   <li class="none">
    451. 

  451.                   <a href="hadoop-sls/SchedulerLoadSimulator.html">Scheduler Load Simulator</a>
    452. 

  452.             </li>
    453. 

  453.                   <li class="none">
    454. 

  454.                   <a href="hadoop-project-dist/hadoop-common/Benchmarking.html">Hadoop Benchmarking</a>
    455. 

  455.             </li>
    456. 

  456.                   <li class="none">
    457. 

  457.                   <a href="hadoop-dynamometer/Dynamometer.html">Dynamometer</a>
    458. 

  458.             </li>
    459. 

  459.           </ul>
    460. 

  460.                        <h5>Reference</h5>
    461. 

  461.                   <ul>
    462. 

  462.                   <li class="none">
    463. 

  463.                   <a href="hadoop-project-dist/hadoop-common/release/">Changelog and Release Notes</a>
    464. 

  464.             </li>
    465. 

  465.                   <li class="none">
    466. 

  466.                   <a href="api/index.html">Java API docs</a>
    467. 

  467.             </li>
    468. 

  468.                   <li class="none">
    469. 

  469.                   <a href="hadoop-project-dist/hadoop-common/UnixShellAPI.html">Unix Shell API</a>
    470. 

  470.             </li>
    471. 

  471.                   <li class="none">
    472. 

  472.                   <a href="hadoop-project-dist/hadoop-common/Metrics.html">Metrics</a>
    473. 

  473.             </li>
    474. 

  474.           </ul>
    475. 

  475.                        <h5>Configuration</h5>
    476. 

  476.                   <ul>
    477. 

  477.                   <li class="none">
    478. 

  478.                   <a href="hadoop-project-dist/hadoop-common/core-default.xml">core-default.xml</a>
    479. 

  479.             </li>
    480. 

  480.                   <li class="none">
    481. 

  481.                   <a href="hadoop-project-dist/hadoop-hdfs/hdfs-default.xml">hdfs-default.xml</a>
    482. 

  482.             </li>
    483. 

  483.                   <li class="none">
    484. 

  484.                   <a href="hadoop-project-dist/hadoop-hdfs-rbf/hdfs-rbf-default.xml">hdfs-rbf-default.xml</a>
    485. 

  485.             </li>
    486. 

  486.                   <li class="none">
    487. 

  487.                   <a href="hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a>
    488. 

  488.             </li>
    489. 

  489.                   <li class="none">
    490. 

  490.                   <a href="hadoop-yarn/hadoop-yarn-common/yarn-default.xml">yarn-default.xml</a>
    491. 

  491.             </li>
    492. 

  492.                   <li class="none">
    493. 

  493.                   <a href="hadoop-kms/kms-default.html">kms-default.xml</a>
    494. 

  494.             </li>
    495. 

  495.                   <li class="none">
    496. 

  496.                   <a href="hadoop-hdfs-httpfs/httpfs-default.html">httpfs-default.xml</a>
    497. 

  497.             </li>
    498. 

  498.                   <li class="none">
    499. 

  499.                   <a href="hadoop-project-dist/hadoop-common/DeprecatedProperties.html">Deprecated Properties</a>
    500. 

  500.             </li>
    501. 

  501.           </ul>
    502. 

  502.                                  <a href="http://maven.apache.org/" title="Built by Maven" class="poweredBy">
    503. 

  503.           <img alt="Built by Maven" src="./images/logos/maven-feather.png"/>
    504. 

  504.         </a>
    505. 

  505.                        
    506. 

  506.                                </div>
    507. 

  507.     </div>
    508. 

  508.     <div id="bodyColumn">
    509. 

  509.       <div id="contentBox">
    510. 

  510.         <!---
    511. 

  511.   Licensed under the Apache License, Version 2.0 (the "License");
    512. 

  512.   you may not use this file except in compliance with the License.
    513. 

  513.   You may obtain a copy of the License at
    514. 

  514. 

  515.    http://www.apache.org/licenses/LICENSE-2.0
    516. 

  516. 

  517.   Unless required by applicable law or agreed to in writing, software
    518. 

  518.   distributed under the License is distributed on an "AS IS" BASIS,
    519. 

  519.   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    520. 

  520.   See the License for the specific language governing permissions and
    521. 

  521.   limitations under the License. See accompanying LICENSE file.
    522. 

  522. -->
    523. 

  523. <h1>Apache Hadoop 3.5.0-SNAPSHOT</h1>
    524. 

  524. <p>Apache Hadoop 3.5.0-SNAPSHOT is an update to the Hadoop 3.4.x release branch.</p>
    525. 

  525. <h1>Overview of Changes</h1>
    526. 

  526. <p>Users are encouraged to read the full set of release notes. This page provides an overview of the major changes.</p><section>
    527. 

  527. <h2><a name="Bulk_Delete_API"></a>Bulk Delete API</h2>
    528. 

  528. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18679">HADOOP-18679</a> Bulk Delete API.</p>
    529. 

  529. <p>This release provides an API to perform bulk delete of files/objects in an object store or filesystem.</p></section><section>
    530. 

  530. <h2><a name="New_binary_distribution"></a>New binary distribution</h2>
    531. 

  531. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-19083">HADOOP-19083</a> provide hadoop binary tarball without aws v2 sdk</p>
    532. 

  532. <p>Hadoop has added a new variant of the binary distribution tarball, labeled with &#x201c;lean&#x201d; in the file name. This tarball excludes the full AWS SDK v2 bundle, resulting in approximately 50% reduction in file size.</p></section><section>
    533. 

  533. <h2><a name="S3A_improvements"></a>S3A improvements</h2>
    534. 

  534. <p><b>Improvement</b></p>
    535. 

  535. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18886">HADOOP-18886</a> S3A: AWS SDK V2 Migration: stabilization and S3Express</p>
    536. 

  536. <p>This release completes stabilization efforts on the AWS SDK v2 migration and support of Amazon S3 Express One Zone storage. S3 Select is no longer supported.</p>
    537. 

  537. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18993">HADOOP-18993</a> S3A: Add option fs.s3a.classloader.isolation (#6301)</p>
    538. 

  538. <p>This introduces configuration property <code>fs.s3a.classloader.isolation</code>, which defaults to <code>true</code>. Set to <code>false</code> to disable S3A classloader isolation, which can be useful for installing custom credential providers in user-provided jars.</p>
    539. 

  539. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-19047">HADOOP-19047</a> Support InMemory Tracking Of S3A Magic Commits</p>
    540. 

  540. <p>The S3A magic committer now supports configuration property <code>fs.s3a.committer.magic.track.commits.in.memory.enabled</code>. Set this to <code>true</code> to track commits in memory instead of on the file system, which reduces the number of remote calls.</p>
    541. 

  541. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-19161">HADOOP-19161</a> S3A: option &#x201c;fs.s3a.performance.flags&#x201d; to take list of performance flags</p>
    542. 

  542. <p>S3A now supports configuration property <code>fs.s3a.performance.flag</code> for controlling activation of multiple performance optimizations. Refer to the S3A performance documentation for details.</p></section><section>
    543. 

  543. <h2><a name="ABFS_improvements"></a>ABFS improvements</h2>
    544. 

  544. <p><b>Improvement</b></p>
    545. 

  545. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18516">HADOOP-18516</a> [ABFS]: Support fixed SAS token config in addition to Custom SASTokenProvider Implementation</p>
    546. 

  546. <p>ABFS now supports authentication via a fixed Shared Access Signature token. Refer to ABFS documentation of configuration property <code>fs.azure.sas.fixed.token</code> for details.</p>
    547. 

  547. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-19089">HADOOP-19089</a> [ABFS] Reverting Back Support of setXAttr() and getXAttr() on root path</p>
    548. 

  548. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18869">HADOOP-18869</a> previously implemented support for xattrs on the root path in the 3.4.0 release. Support for this has been removed in 3.4.1 to prevent the need for calling container APIs.</p>
    549. 

  549. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-19178">HADOOP-19178</a> WASB Driver Deprecation and eventual removal</p>
    550. 

  550. <p>This release announces deprecation of the WASB file system in favor of ABFS. Refer to ABFS documentation for additional guidance.</p>
    551. 

  551. <p><b>Bug</b></p>
    552. 

  552. <p><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-18542">HADOOP-18542</a> Azure Token provider requires tenant and client IDs despite being optional</p>
    553. 

  553. <p>It is no longer necessary to specify a tenant and client ID in configuration for MSI authentication when running in an Azure instance.</p></section><section>
    554. 

  554. <h2><a name="Transitive_CVE_fixes"></a>Transitive CVE fixes</h2>
    555. 

  555. <p>A lot of dependencies have been upgraded to address recent CVEs. Many of the CVEs were not actually exploitable through the Hadoop so much of this work is just due diligence. However, applications which have all the library is on a class path may be vulnerable, and the upgrades should also reduce the number of false positives security scanners report.</p>
    556. 

  556. <p>We have not been able to upgrade every single dependency to the latest version there is. Some of those changes are fundamentally incompatible. If you have concerns about the state of a specific library, consult the Apache JIRA issue tracker to see if an issue has been filed, discussions have taken place about the library in question, and whether or not there is already a fix in the pipeline. <i>Please don&#x2019;t file new JIRAs about dependency-X.Y.Z having a CVE without searching for any existing issue first</i></p>
    557. 

  557. <p>As an open-source project, contributions in this area are always welcome, especially in testing the active branches, testing applications downstream of those branches and of whether updated dependencies trigger regressions.</p>
    558. 

  558. <h1>Security Advisory</h1>
    559. 

  559. <p>Hadoop HDFS is a distributed filesystem allowing remote callers to read and write data.</p>
    560. 

  560. <p>Hadoop YARN is a distributed job submission/execution engine allowing remote callers to submit arbitrary work into the cluster.</p>
    561. 

  561. <p>Unless a Hadoop cluster is deployed with <a href="./hadoop-project-dist/hadoop-common/SecureMode.html">caller authentication with Kerberos</a>, anyone with network access to the servers has unrestricted access to the data and the ability to run whatever code they want in the system.</p>
    562. 

  562. <p>In production, there are generally three deployment patterns which can, with care, keep data and computing resources private. 1. Physical cluster: <i>configure Hadoop security</i>, usually bonded to the enterprise Kerberos/Active Directory systems. Good. 2. Cloud: transient or persistent single or multiple user/tenant cluster with private VLAN <i>and security</i>. Good. Consider <a class="externalLink" href="https://knox.apache.org/">Apache Knox</a> for managing remote access to the cluster. 3. Cloud: transient single user/tenant cluster with private VLAN <i>and no security at all</i>. Requires careful network configuration as this is the sole means of securing the cluster.. Consider <a class="externalLink" href="https://knox.apache.org/">Apache Knox</a> for managing remote access to the cluster.</p>
    563. 

  563. <p><i>If you deploy a Hadoop cluster in-cloud without security, and without configuring a VLAN to restrict access to trusted users, you are implicitly sharing your data and computing resources with anyone with network access</i></p>
    564. 

  564. <p>If you do deploy an insecure cluster this way then port scanners will inevitably find it and submit crypto-mining jobs. If this happens to you, please do not report this as a CVE or security issue: it is <i>utterly predictable</i>. Secure <i>your cluster</i> if you want to remain exclusively <i>your cluster</i>.</p>
    565. 

  565. <p>Finally, if you are using Hadoop as a service deployed/managed by someone else, do determine what security their products offer and make sure it meets your requirements.</p>
    566. 

  566. <h1>Getting Started</h1>
    567. 

  567. <p>The Hadoop documentation includes the information you need to get started using Hadoop. Begin with the <a href="./hadoop-project-dist/hadoop-common/SingleCluster.html">Single Node Setup</a> which shows you how to set up a single-node Hadoop installation. Then move on to the <a href="./hadoop-project-dist/hadoop-common/ClusterSetup.html">Cluster Setup</a> to learn how to set up a multi-node Hadoop installation.</p>
    568. 

  568. <p>Before deploying Hadoop in production, read <a href="./hadoop-project-dist/hadoop-common/SecureMode.html">Hadoop in Secure Mode</a>, and follow its instructions to secure your cluster.</p></section>
    569. 

  569.       </div>
    570. 

  570.     </div>
    571. 

  571.     <div class="clear">
    572. 

  572.       <hr/>
    573. 

  573.     </div>
    574. 

  574.     <div id="footer">
    575. 

  575.       <div class="xright">
    576. 

  576.         &#169;            2008-2025
    577. 

  577.               Apache Software Foundation
    578. 

  578.             
    579. 

  579.                           - <a href="http://maven.apache.org/privacy-policy.html">Privacy Policy</a>.
    580. 

  580.         Apache Maven, Maven, Apache, the Apache feather logo, and the Apache Maven project logos are trademarks of The Apache Software Foundation.
    581. 

  581.       </div>
    582. 

  582.       <div class="clear">
    583. 

  583.         <hr/>
    584. 

  584.       </div>
    585. 

  585.     </div>
    586. 

  586.   </body>
    587. 

  587. </html>
    588.