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| 195 | <h1> |
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| 196 | HadoopååžåŒæ件系ç»äœ¿çšæå |
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| 201 | <a href="#%E7%9B%AE%E7%9A%84">ç®ç</a> |
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| 206 | <li> |
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| 207 | <a href="#%E5%85%88%E5%86%B3%E6%9D%A1%E4%BB%B6"> å
å³æ¡ä»¶ </a> |
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| 210 | <a href="#Web%E6%8E%A5%E5%8F%A3"> Webæ¥å£ </a> |
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| 213 | <a href="#Shell%E5%91%BD%E4%BB%A4">Shellåœä»€</a> |
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| 214 | <ul class="minitoc"> |
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| 215 | <li> |
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| 216 | <a href="#DFSAdmin%E5%91%BD%E4%BB%A4"> DFSAdminåœä»€ </a> |
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| 217 | </li> |
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| 218 | </ul> |
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| 219 | </li> |
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| 220 | <li> |
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| 221 | <a href="#Secondary+NameNode"> Secondary NameNode </a> |
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| 222 | </li> |
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| 223 | <li> |
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| 224 | <a href="#Rebalancer"> Rebalancer </a> |
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| 225 | </li> |
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| 226 | <li> |
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| 227 | <a href="#%E6%9C%BA%E6%9E%B6%E6%84%9F%E7%9F%A5%EF%BC%88Rack+awareness%EF%BC%89"> æºæ¶æç¥ïŒRack awarenessïŒ </a> |
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šæš¡åŒ </a> |
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| 231 | </li> |
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| 232 | <li> |
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| 233 | <a href="#fsck"> fsck </a> |
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| 234 | </li> |
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| 235 | <li> |
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| 236 | <a href="#%E5%8D%87%E7%BA%A7%E5%92%8C%E5%9B%9E%E6%BB%9A"> å级ååæ» </a> |
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| 237 | </li> |
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| 238 | <li> |
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| 239 | <a href="#%E6%96%87%E4%BB%B6%E6%9D%83%E9%99%90%E5%92%8C%E5%AE%89%E5%85%A8%E6%80%A7"> æ件æéåå®å
šæ§ </a> |
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| 240 | </li> |
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| 241 | <li> |
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| 242 | <a href="#%E5%8F%AF%E6%89%A9%E5%B1%95%E6%80%A7"> å¯æ©å±æ§ </a> |
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| 243 | </li> |
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| 244 | <li> |
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| 245 | <a href="#%E7%9B%B8%E5%85%B3%E6%96%87%E6%A1%A3"> çžå
³ææ¡£ </a> |
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| 246 | </li> |
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| 247 | </ul> |
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| 248 | </div> |
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| 249 | |
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| 250 | <a name="N1000F"></a><a name="%E7%9B%AE%E7%9A%84"></a> |
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| 251 | <h2 class="h3">ç®ç</h2> |
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| 252 | <div class="section"> |
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| 253 | <p> |
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| 254 | æ¬ææ¡£çç®æ æ¯äžºHadoopååžåŒæ件系ç»ïŒHDFSïŒççšæ·æäŸäžäžªåŠä¹ çèµ·ç¹ïŒè¿éçHDFSæ¢å¯ä»¥äœäžº<a href="http://hadoop.apache.org/">Hadoop</a>é矀çäžéšåïŒä¹å¯ä»¥äœäžºäžäžªç¬ç«çååžåŒæ件系ç»ãèœç¶HDFSåšåŸå€ç¯å¢äžè¢«è®Ÿè®¡ææ¯å¯æ£ç¡®å·¥äœçïŒäœæ¯äºè§£HDFSçå·¥äœåç对åšç¹å®é矀äžæ¹è¿HDFSçè¿è¡æ§èœåé误è¯æéœææ倧çåž®å©ã |
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| 255 | </p> |
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| 256 | </div> |
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| 257 | <!--DCCOMMENT:diff end |
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| 258 | @@ -23,18 +23,18 @@ |
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| 259 | |
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| 260 | <header> |
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| 261 | <title> |
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| 262 | - Hadoop DFS User Guide |
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| 263 | + HDFS User Guide |
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| 264 | </title> |
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| 265 | </header> |
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| 266 | |
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| 267 | <body> |
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| 268 | <section> <title>Purpose</title> |
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| 269 | <p> |
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| 270 | - This document aims to be the starting point for users working with |
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| 271 | + This document is a starting point for users working with |
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| 272 | Hadoop Distributed File System (HDFS) either as a part of a |
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| 273 | <a href="http://hadoop.apache.org/">Hadoop</a> |
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| 274 | cluster or as a stand-alone general purpose distributed file system. |
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| 275 | - While HDFS is designed to "just-work" in many environments, a working |
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| 276 | + While HDFS is designed to "just work" in many environments, a working |
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| 277 | knowledge of HDFS helps greatly with configuration improvements and |
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| 278 | diagnostics on a specific cluster. |
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| 279 | </p> |
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| 280 | |
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| 281 | --> |
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| 282 | <!--DCCOMMENT:begin--> |
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| 283 | |
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| 284 | |
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| 285 | <a name="N10021"></a><a name="%E6%A6%82%E8%BF%B0"></a> |
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| 286 | <h2 class="h3"> æŠè¿° </h2> |
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| 287 | <div class="section"> |
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| 288 | <p> |
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| 289 | HDFSæ¯Hadoopåºçšçšå°çäžäžªæäž»èŠçååžåŒååšç³»ç»ãäžäžªHDFSé矀䞻èŠç±äžäžªNameNodeååŸå€äžªDatanodeç»æïŒNamenode管çæ件系ç»çå
æ°æ®ïŒèDatanodeååšäºå®é
çæ°æ®ãHDFSçäœç³»ç»æåš<a href="hdfs_design.html">è¿é</a>æ诊ç»çæè¿°ãæ¬æ档䞻èŠå
³æ³šçšæ·ä»¥å管çåææ ·åHDFSè¿è¡äº€äºã<a href="hdfs_design.html">HDFSæ¶æ讟计</a>äžç<a href="images/hdfsarchitecture.gif">åŸè§£</a>æè¿°äºNamenodeãDatanodeå客æ·ç«¯ä¹éŽçåºæ¬ç亀äºæäœãåºæ¬äžïŒå®¢æ·ç«¯èç³»Namenode以è·åæ件çå
æ°æ®æ修饰å±æ§ïŒèçæ£çæ件I/Oæäœæ¯çŽæ¥åDatanodeè¿è¡äº€äºçã |
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| 290 | </p> |
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| 291 | <p> |
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| 292 | äžé¢ååºäºäžäºå€æ°çšæ·éœæ¯èŸæå
Žè¶£çéèŠç¹æ§ã |
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| 293 | </p> |
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| 294 | <ul> |
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| 295 | |
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| 296 | <li> |
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| 297 | <!--DCCOMMENT:end |
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| 298 | note:all tag "<em>" has been deleted in this doc. |
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| 299 | |
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| 300 | @@ -43,21 +43,20 @@ |
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| 301 | <section> <title> Overview </title> |
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| 302 | <p> |
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| 303 | HDFS is the primary distributed storage used by Hadoop applications. A |
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| 304 | - HDFS cluster primarily consists of a <em>NameNode</em> that manages the |
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| 305 | - filesystem metadata and Datanodes that store the actual data. The |
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| 306 | + HDFS cluster primarily consists of a NameNode that manages the |
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| 307 | + file system metadata and DataNodes that store the actual data. The |
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| 308 | architecture of HDFS is described in detail |
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| 309 | <a href="hdfs_design.html">here</a>. This user guide primarily deals with |
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| 310 | interaction of users and administrators with HDFS clusters. |
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| 311 | The <a href="images/hdfsarchitecture.gif">diagram</a> from |
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| 312 | <a href="hdfs_design.html">HDFS architecture</a> depicts |
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| 313 | - basic interactions among Namenode, Datanodes, and the clients. Eseentially, |
---|
| 314 | - clients contact Namenode for file metadata or file modifications and perform |
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| 315 | - actual file I/O directly with the datanodes. |
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| 316 | + basic interactions among NameNode, the DataNodes, and the clients. |
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| 317 | + Clients contact NameNode for file metadata or file modifications and perform |
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| 318 | + actual file I/O directly with the DataNodes. |
---|
| 319 | </p> |
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| 320 | <p> |
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| 321 | The following are some of the salient features that could be of |
---|
| 322 | - interest to many users. The terms in <em>italics</em> |
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| 323 | - are described in later sections. |
---|
| 324 | + interest to many users. |
---|
| 325 | </p> |
---|
| 326 | <ul> |
---|
| 327 | <li> |
---|
| 328 | --> |
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| 329 | HadoopïŒå
æ¬HDFSïŒéåžžéååšåçšç¡¬ä»¶ïŒcommodity hardwareïŒäžåååžåŒååšå计ç®ïŒå 䞺å®äžä»
å
·æ容éæ§åå¯æ©å±æ§ïŒèäžéåžžæäºæ©å±ã<a href="mapred_tutorial.html">Map-Reduce</a>æ¡æ¶ä»¥å
¶åšå€§åååžåŒç³»ç»åºçšäžçç®åæ§åå¯çšæ§èè称ïŒè¿äžªæ¡æ¶å·²ç»è¢«éæè¿Hadoopäžã |
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| 330 | </li> |
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| 331 | |
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| 332 | <li> |
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| 333 | HDFSçå¯é
眮æ§æé«ïŒåæ¶ïŒå®çé»è®€é
眮èœå€æ»¡è¶³åŸå€çå®è£
ç¯å¢ãå€æ°æ
åµäžïŒè¿äºåæ°åªåšé垞倧è§æš¡çé矀ç¯å¢äžæéèŠè°æŽã |
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| 334 | </li> |
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| 335 | <!--DCCOMMENT:diff begin--> |
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| 336 | |
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| 337 | <li> |
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| 338 | çšJavaè¯èšåŒåïŒæ¯æææçäž»æµå¹³å°ã |
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| 339 | </li> |
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| 340 | |
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| 341 | <li> |
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| 342 | æ¯æç±»Shellåœä»€ïŒå¯çŽæ¥åHDFSè¿è¡äº€äºã |
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| 343 | </li> |
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| 344 | |
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| 345 | <li> |
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| 346 | NameNodeåDataNodeæå
眮çWebæå¡åšïŒæ¹äŸ¿çšæ·æ£æ¥é矀çåœåç¶æã |
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| 347 | </li> |
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| 348 | <!--DCCOMMENT:diff end |
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| 349 | @@ -74,13 +73,13 @@ |
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| 350 | needs to be tuned only for very large clusters. |
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| 351 | </li> |
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| 352 | <li> |
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| 353 | - It is written in Java and is supported on all major platforms. |
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| 354 | + Hadoop is written in Java and is supported on all major platforms. |
---|
| 355 | </li> |
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| 356 | <li> |
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| 357 | - Supports <em>shell like commands</em> to interact with HDFS directly. |
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| 358 | + Hadoop supports shell-like commands to interact with HDFS directly. |
---|
| 359 | </li> |
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| 360 | <li> |
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| 361 | - Namenode and Datanodes have built in web servers that makes it |
---|
| 362 | + The NameNode and Datanodes have built in web servers that makes it |
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| 363 | easy to check current status of the cluster. |
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| 364 | </li> |
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| 365 | <li> |
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| 366 | --> |
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| 367 | |
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| 368 | <li> |
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| 369 | æ°ç¹æ§åæ¹è¿äŒå®æå å
¥HDFSçå®ç°äžãäžé¢ååºçæ¯HDFSäžåžžçšç¹æ§çäžéšåïŒ |
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| 370 | <ul> |
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| 371 | |
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| 372 | <li> |
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| 373 | æ件æéåææã |
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| 374 | </li> |
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| 375 | |
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| 376 | <li> |
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| 377 | æºæ¶æç¥ïŒRack awarenessïŒïŒåšè°åºŠä»»å¡ååé
ååšç©ºéŽæ¶èèèç¹çç©çäœçœ®ã |
---|
| 378 | </li> |
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| 379 | |
---|
| 380 | <li> |
---|
| 381 | å®å
šæš¡åŒïŒäžç§ç»Žæ€éèŠç管çæš¡åŒã |
---|
| 382 | </li> |
---|
| 383 | |
---|
| 384 | <li> |
---|
| 385 | fsckïŒäžäžªè¯ææ件系ç»å¥åº·ç¶åµçå·¥å
·ïŒèœå€åç°äž¢å€±çæ件ææ°æ®åã |
---|
| 386 | </li> |
---|
| 387 | |
---|
| 388 | <li> |
---|
| 389 | RebalancerïŒåœdatanodeä¹éŽæ°æ®äžåè¡¡æ¶ïŒå¹³è¡¡é矀äžçæ°æ®èŽèœœã |
---|
| 390 | </li> |
---|
| 391 | |
---|
| 392 | <li> |
---|
| 393 | å级ååæ»ïŒåšèœ¯ä»¶æŽæ°åæåŒåžžåççæ
圢äžïŒèœå€åæ»å°HDFSå级ä¹åçç¶æã |
---|
| 394 | </li> |
---|
| 395 | |
---|
| 396 | <li> |
---|
| 397 | Secondary NamenodeïŒå¯¹æ件系ç»åå空éŽæ§è¡åšææ§çæ£æ¥ç¹ïŒå°NamenodeäžHDFSæ¹åšæ¥å¿æ件ç倧å°æ§å¶åšæ䞪ç¹å®çé床äžã |
---|
| 398 | </li> |
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| 399 | |
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| 400 | </ul> |
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| 401 | |
---|
| 402 | </li> |
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| 403 | |
---|
| 404 | </ul> |
---|
| 405 | </div> |
---|
| 406 | <a name="N10071"></a><a name="%E5%85%88%E5%86%B3%E6%9D%A1%E4%BB%B6"></a> |
---|
| 407 | <h2 class="h3"> å
å³æ¡ä»¶ </h2> |
---|
| 408 | <div class="section"> |
---|
| 409 | <p> |
---|
| 410 | äžé¢çææ¡£æè¿°äºåŠäœå®è£
åæ建HadoopéçŸ€ïŒ |
---|
| 411 | </p> |
---|
| 412 | <ul> |
---|
| 413 | |
---|
| 414 | <li> |
---|
| 415 | |
---|
| 416 | <a href="quickstart.html">Hadoopå¿«éå
¥éš</a> |
---|
| 417 | é对å次䜿çšè
ã |
---|
| 418 | </li> |
---|
| 419 | |
---|
| 420 | <li> |
---|
| 421 | |
---|
| 422 | <a href="cluster_setup.html">Hadoopé矀æ建</a> |
---|
| 423 | é对倧è§æš¡ååžåŒé矀çæ建ã |
---|
| 424 | </li> |
---|
| 425 | |
---|
| 426 | </ul> |
---|
| 427 | <p> |
---|
| 428 | ææ¡£äœäžéšåå讟çšæ·å·²ç»å®è£
并è¿è¡äºè³å°å
å«äžäžªDatanodeèç¹çHDFSãå°±æ¬æç®çæ¥è¯ŽïŒNamenodeåDatanodeå¯ä»¥è¿è¡åšåäžäžªç©çäž»æºäžã |
---|
| 429 | </p> |
---|
| 430 | </div> |
---|
| 431 | <a name="N1008F"></a><a name="Web%E6%8E%A5%E5%8F%A3"></a> |
---|
| 432 | <h2 class="h3"> Webæ¥å£ </h2> |
---|
| 433 | <div class="section"> |
---|
| 434 | <p> |
---|
| 435 | NameNodeåDataNodeåèªå¯åšäºäžäžªå
眮çWebæå¡åšïŒæŸç€ºäºé矀åœåçåºæ¬ç¶æåä¿¡æ¯ãåšé»è®€é
眮äžNameNodeçéŠé¡µå°åæ¯<span class="codefrag">http://namenode-name:50070/</span>ãè¿äžªé¡µé¢ååºäºé矀éçææDataNodeåé矀çåºæ¬ç¶æãè¿äžªWebæ¥å£ä¹å¯ä»¥çšæ¥æµè§æŽäžªæ件系ç»ïŒäœ¿çšNameNodeéŠé¡µäžç"Browse the file system"éŸæ¥ïŒã |
---|
| 436 | </p> |
---|
| 437 | </div> |
---|
| 438 | <a name="N100A2"></a><a name="Shell%E5%91%BD%E4%BB%A4"></a> |
---|
| 439 | <h2 class="h3">Shellåœä»€</h2> |
---|
| 440 | <div class="section"> |
---|
| 441 | <p>Hadoopå
æ¬äžç³»åçç±»shellçåœä»€ïŒå¯çŽæ¥åHDFS以åå
¶ä»Hadoopæ¯æçæ件系ç»è¿è¡äº€äºã<span class="codefrag">bin/hadoop fs -help</span> åœä»€ååºææHadoop Shellæ¯æçåœä»€ãè <span class="codefrag">bin/hadoop fs -help command-name</span> åœä»€èœæŸç€ºå
³äºæ䞪åœä»€ç诊ç»ä¿¡æ¯ãè¿äºåœä»€æ¯æ倧å€æ°æ®éæ件系ç»çæäœïŒæ¯åŠå€å¶æ件ãæ¹åæ件æéçãå®è¿æ¯æäžäºHDFSç¹æçæäœïŒæ¯åŠæ¹åæ件å¯æ¬æ°ç®ã |
---|
| 442 | </p> |
---|
| 443 | <a name="N100B3"></a><a name="DFSAdmin%E5%91%BD%E4%BB%A4"></a> |
---|
| 444 | <h3 class="h4"> DFSAdminåœä»€ </h3> |
---|
| 445 | <p> |
---|
| 446 | |
---|
| 447 | <span class="codefrag">'bin/hadoop dfsadmin'</span> åœä»€æ¯æäžäºåHDFS管ççžå
³çæäœã<span class="codefrag">bin/hadoop dfsadmin -help</span> åœä»€èœååºææåœåæ¯æçåœä»€ãæ¯åŠïŒ |
---|
| 448 | </p> |
---|
| 449 | <ul> |
---|
| 450 | |
---|
| 451 | <li> |
---|
| 452 | <!--DCCOMMENT:diff begin--> |
---|
| 453 | |
---|
| 454 | <span class="codefrag">-report</span>ïŒæ¥åHDFSçåºæ¬ç»è®¡ä¿¡æ¯ãæäºä¿¡æ¯ä¹å¯ä»¥åšNameNode Webæå¡éŠé¡µçå°ã |
---|
| 455 | <!--DCCOMMENT:diff end |
---|
| 456 | note: "Namenode" is replaced by "NameNode" in this doc |
---|
| 457 | |
---|
| 458 | <li> |
---|
| 459 | <code>-report</code> |
---|
| 460 | - : reports basic stats of HDFS. Some of this information is |
---|
| 461 | - also available on the Namenode front page. |
---|
| 462 | + : reports basic statistics of HDFS. Some of this information is |
---|
| 463 | + also available on the NameNode front page. |
---|
| 464 | </li> |
---|
| 465 | --> |
---|
| 466 | </li> |
---|
| 467 | |
---|
| 468 | <li> |
---|
| 469 | |
---|
| 470 | <span class="codefrag">-safemode</span>ïŒèœç¶é垞并äžéèŠïŒäœæ¯ç®¡çåçç¡®å¯ä»¥æåšè®©NameNodeè¿å
¥æ犻åŒå®å
šæš¡åŒã |
---|
| 471 | </li> |
---|
| 472 | |
---|
| 473 | <li> |
---|
| 474 | |
---|
| 475 | <span class="codefrag">-finalizeUpgrade</span>ïŒå é€äžäžæ¬¡å级æ¶å¶äœçé矀å€ä»œã |
---|
| 476 | </li> |
---|
| 477 | |
---|
| 478 | </ul> |
---|
| 479 | </div> |
---|
| 480 | <a name="N100DD"></a><a name="Secondary+NameNode"></a> |
---|
| 481 | <h2 class="h3"> Secondary NameNode </h2> |
---|
| 482 | <div class="section"> |
---|
| 483 | <p>NameNodeå°å¯¹æ件系ç»çæ¹åšè¿œå ä¿åå°æ¬å°æ件系ç»äžçäžäžªæ¥å¿æ件ïŒ<span class="codefrag">edits</span>ïŒãåœäžäžªNameNodeå¯åšæ¶ïŒå®éŠå
ä»äžäžªæ åæ件ïŒ<span class="codefrag">fsimage</span>ïŒäžè¯»åHDFSçç¶æïŒæ¥çåºçšæ¥å¿æ件äžçeditsæäœãç¶åå®å°æ°çHDFSç¶æåå
¥ïŒ<span class="codefrag">fsimage</span>ïŒäžïŒå¹¶äœ¿çšäžäžªç©ºçeditsæ件åŒå§æ£åžžæäœãå 䞺NameNodeåªæåšå¯åšé¶æ®µæå并<span class="codefrag">fsimage</span>å<span class="codefrag">edits</span>ïŒæ以ä¹
èä¹
ä¹æ¥å¿æ件å¯èœäŒååŸéåžžåºå€§ïŒç¹å«æ¯å¯¹å€§åçé矀ãæ¥å¿æ件倪倧çåŠäžäžªå¯äœçšæ¯äžäžæ¬¡NameNodeå¯åšäŒè±åŸé¿æ¶éŽã |
---|
| 484 | </p> |
---|
| 485 | <p> |
---|
| 486 | Secondary NameNodeå®æå并fsimageåeditsæ¥å¿ïŒå°editsæ¥å¿æ件倧å°æ§å¶åšäžäžªé床äžãå 䞺å
åéæ±åNameNodeåšäžäžªæ°é级äžïŒæ以éåžžsecondary NameNodeåNameNodeè¿è¡åšäžåçæºåšäžãSecondary NameNodeéè¿<span class="codefrag">bin/start-dfs.sh</span>åš<span class="codefrag">conf/masters</span>äžæå®çèç¹äžå¯åšã |
---|
| 487 | </p> |
---|
| 488 | <p> |
---|
| 489 | Secondary NameNodeçæ£æ¥ç¹è¿çšå¯åšïŒæ¯ç±äž€äžªé
眮åæ°æ§å¶çïŒ |
---|
| 490 | </p> |
---|
| 491 | <ul> |
---|
| 492 | |
---|
| 493 | <li> |
---|
| 494 | |
---|
| 495 | <span class="codefrag">fs.checkpoint.period</span>ïŒæå®è¿ç»äž€æ¬¡æ£æ¥ç¹çæ倧æ¶éŽéŽéïŒ |
---|
| 496 | é»è®€åŒæ¯1å°æ¶ã |
---|
| 497 | </li> |
---|
| 498 | |
---|
| 499 | <li> |
---|
| 500 | |
---|
| 501 | <span class="codefrag">fs.checkpoint.size</span>å®ä¹äºeditsæ¥å¿æ件çæ倧åŒïŒäžæŠè¶
è¿è¿äžªåŒäŒå¯ŒèŽåŒºå¶æ§è¡æ£æ¥ç¹ïŒå³äœ¿æ²¡å°æ£æ¥ç¹çæ倧æ¶éŽéŽéïŒãé»è®€åŒæ¯64MBã |
---|
| 502 | </li> |
---|
| 503 | |
---|
| 504 | </ul> |
---|
| 505 | <p> |
---|
| 506 | Secondary NameNodeä¿åææ°æ£æ¥ç¹çç®åœäžNameNodeçç®åœç»æçžåã |
---|
| 507 | æ以NameNodeå¯ä»¥åšéèŠçæ¶å读åSecondary NameNodeäžçæ£æ¥ç¹éåã |
---|
| 508 | </p> |
---|
| 509 | <p> |
---|
| 510 | åŠæNameNodeäžé€äºææ°çæ£æ¥ç¹ä»¥å€ïŒææçå
¶ä»çåå²éååeditsæ件éœäž¢å€±äºïŒ |
---|
| 511 | NameNodeå¯ä»¥åŒå
¥è¿äžªææ°çæ£æ¥ç¹ã以äžæäœå¯ä»¥å®ç°è¿äžªåèœïŒ |
---|
| 512 | </p> |
---|
| 513 | <ul> |
---|
| 514 | |
---|
| 515 | <li> |
---|
| 516 | åšé
眮åæ°<span class="codefrag">dfs.name.dir</span>æå®çäœçœ®å»ºç«äžäžªç©ºæä»¶å€¹ïŒ |
---|
| 517 | </li> |
---|
| 518 | |
---|
| 519 | <li> |
---|
| 520 | ææ£æ¥ç¹ç®åœçäœçœ®èµåŒç»é
眮åæ°<span class="codefrag">fs.checkpoint.dir</span>ïŒ |
---|
| 521 | </li> |
---|
| 522 | |
---|
| 523 | <li> |
---|
| 524 | å¯åšNameNodeïŒå¹¶å äž<span class="codefrag">-importCheckpoint</span>ã |
---|
| 525 | </li> |
---|
| 526 | |
---|
| 527 | </ul> |
---|
| 528 | <p> |
---|
| 529 | NameNodeäŒä»<span class="codefrag">fs.checkpoint.dir</span>ç®åœè¯»åæ£æ¥ç¹ïŒ |
---|
| 530 | 并æå®ä¿ååš<span class="codefrag">dfs.name.dir</span>ç®åœäžã |
---|
| 531 | åŠæ<span class="codefrag">dfs.name.dir</span>ç®åœäžæåæ³çéåæ件ïŒNameNodeäŒå¯åšå€±èŽ¥ã |
---|
| 532 | NameNodeäŒæ£æ¥<span class="codefrag">fs.checkpoint.dir</span>ç®åœäžéåæ件çäžèŽæ§ïŒäœæ¯äžäŒå»æ¹åšå®ã |
---|
| 533 | </p> |
---|
| 534 | <p> |
---|
| 535 | åœä»€ç䜿çšæ¹æ³è¯·åè<a href="commands_manual.html#secondarynamenode"><span class="codefrag">secondarynamenode</span> åœä»€</a>. |
---|
| 536 | </p> |
---|
| 537 | </div> |
---|
| 538 | <a name="N10148"></a><a name="Rebalancer"></a> |
---|
| 539 | <h2 class="h3"> Rebalancer </h2> |
---|
| 540 | <div class="section"> |
---|
| 541 | <p> |
---|
| 542 | HDFSçæ°æ®ä¹è®žå¹¶äžæ¯éåžžååçååžåšå䞪DataNodeäžãäžäžªåžžè§çåå æ¯åšç°æçé矀äžç»åžžäŒå¢æ·»æ°çDataNodeèç¹ãåœæ°å¢äžäžªæ°æ®åïŒäžäžªæ件çæ°æ®è¢«ä¿ååšäžç³»åçåäžïŒæ¶ïŒNameNodeåšéæ©DataNodeæ¥æ¶è¿äžªæ°æ®åä¹åïŒäŒèèå°åŸå€å çŽ ãå
¶äžçäžäºèèçæ¯ïŒ |
---|
| 543 | </p> |
---|
| 544 | <ul> |
---|
| 545 | |
---|
| 546 | <li> |
---|
| 547 | å°æ°æ®åçäžäžªå¯æ¬æŸåšæ£åšåè¿äžªæ°æ®åçèç¹äžã |
---|
| 548 | </li> |
---|
| 549 | |
---|
| 550 | <li> |
---|
| 551 | å°œéå°æ°æ®åçäžåå¯æ¬ååžåšäžåçæºæ¶äžïŒè¿æ ·é矀å¯åšå®å
šå€±å»æäžæºæ¶çæ
åµäžè¿èœå掻ã |
---|
| 552 | </li> |
---|
| 553 | |
---|
| 554 | <li> |
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| 555 | äžäžªå¯æ¬é垞被æŸçœ®åšååæ件çèç¹åäžæºæ¶çæ䞪èç¹äžïŒè¿æ ·å¯ä»¥åå°è·šè¶æºæ¶ççœç»I/Oã |
---|
| 556 | </li> |
---|
| 557 | |
---|
| 558 | <li> |
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| 559 | å°œéååå°å°HDFSæ°æ®ååžåšé矀çDataNodeäžã |
---|
| 560 | </li> |
---|
| 561 | |
---|
| 562 | </ul> |
---|
| 563 | <p> |
---|
| 564 | ç±äºäžè¿°å€ç§èèéèŠåèïŒæ°æ®å¯èœå¹¶äžäŒååååžåšDataNodeäžãHDFS䞺管çåæäŸäºäžäžªå·¥å
·ïŒçšäºåææ°æ®åååžåéæ°å¹³è¡¡DataNodeäžçæ°æ®ååžã<a href="http://issues.apache.org/jira/browse/HADOOP-1652">HADOOP-1652</a>çé件äžçäžäžª<a href="http://issues.apache.org/jira/secure/attachment/12368261/RebalanceDesign6.pdf">PDF</a>æ¯äžäžªç®èŠçrebalancer管çåæåã |
---|
| 565 | </p> |
---|
| 566 | <p> |
---|
| 567 | 䜿çšæ¹æ³è¯·åè<a href="commands_manual.html#balancer">balancer åœä»€</a>. |
---|
| 568 | </p> |
---|
| 569 | </div> |
---|
| 570 | <a name="N1017B"></a><a name="%E6%9C%BA%E6%9E%B6%E6%84%9F%E7%9F%A5%EF%BC%88Rack+awareness%EF%BC%89"></a> |
---|
| 571 | <h2 class="h3"> æºæ¶æç¥ïŒRack awarenessïŒ </h2> |
---|
| 572 | <div class="section"> |
---|
| 573 | <p> |
---|
| 574 | éåžžïŒå€§åHadoopé矀æ¯ä»¥æºæ¶ç圢åŒæ¥ç»ç»çïŒåäžäžªæºæ¶äžäžåèç¹éŽççœç»ç¶åµæ¯äžåæºæ¶ä¹éŽçæŽäžºçæ³ãåŠå€ïŒNameNode讟æ³å°æ°æ®åå¯æ¬ä¿ååšäžåçæºæ¶äžä»¥æé«å®¹éæ§ãHadoopå
讞é矀ç管çåéè¿é
眮<span class="codefrag">dfs.network.script</span>åæ°æ¥ç¡®å®èç¹æå€çæºæ¶ãåœè¿äžªèæ¬é
眮å®æ¯ïŒæ¯äžªèç¹éœäŒè¿è¡è¿äžªèæ¬æ¥è·åå®çæºæ¶IDãé»è®€çå®è£
åå®ææçèç¹å±äºåäžäžªæºæ¶ãè¿äžªç¹æ§åå
¶é
眮åæ°åš<a href="http://issues.apache.org/jira/browse/HADOOP-692">HADOOP-692</a>æéç<a href="http://issues.apache.org/jira/secure/attachment/12345251/Rack_aware_HDFS_proposal.pdf">PDF</a>äžææŽè¯Šç»çæè¿°ã |
---|
| 575 | </p> |
---|
| 576 | </div> |
---|
| 577 | <a name="N10190"></a><a name="%E5%AE%89%E5%85%A8%E6%A8%A1%E5%BC%8F"></a> |
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| 578 | <h2 class="h3"> å®å
šæš¡åŒ </h2> |
---|
| 579 | <div class="section"> |
---|
| 580 | <p> |
---|
| 581 | NameNodeå¯åšæ¶äŒä»fsimageåeditsæ¥å¿æ件äžè£
蜜æ件系ç»çç¶æä¿¡æ¯ïŒæ¥çå®çåŸ
å䞪DataNodeåå®æ¥åå®ä»¬åèªçæ°æ®åç¶æïŒè¿æ ·ïŒNameNodeå°±äžäŒè¿æ©å°åŒå§å€å¶æ°æ®åïŒå³äœ¿åšå¯æ¬å
足çæ
åµäžãè¿äžªé¶æ®µïŒNameNodeå€äºå®å
šæš¡åŒäžãNameNodeçå®å
šæš¡åŒæ¬èŽšäžæ¯HDFSé矀çäžç§åªè¯»æš¡åŒïŒæ€æ¶é矀äžå
讞任äœå¯¹æ件系ç»æè
æ°æ®åä¿®æ¹çæäœãéåžžNameNodeäŒåšåŒå§é¶æ®µèªåšå°éåºå®å
šæš¡åŒãåŠæéèŠïŒäœ ä¹å¯ä»¥éè¿<span class="codefrag">'bin/hadoop dfsadmin -safemode'</span>åœä»€æŸåŒå°å°HDFS眮äºå®å
šæš¡åŒãNameNodeéŠé¡µäŒæŸç€ºåœåæ¯åŠå€äºå®å
šæš¡åŒãå
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šæš¡åŒçæŽå€ä»ç»åé
眮信æ¯è¯·åèJavaDocïŒ<a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/dfs/NameNode.html#setSafeMode(org.apache.hadoop.dfs.FSConstants.SafeModeAction)"><span class="codefrag">setSafeMode()</span></a>ã |
---|
| 582 | </p> |
---|
| 583 | </div> |
---|
| 584 | <a name="N101A2"></a><a name="fsck"></a> |
---|
| 585 | <h2 class="h3"> fsck </h2> |
---|
| 586 | <div class="section"> |
---|
| 587 | <p> |
---|
| 588 | HDFSæ¯æ<span class="codefrag">fsck</span>åœä»€æ¥æ£æ¥ç³»ç»äžçåç§äžäžèŽç¶åµãè¿äžªåœä»€è¢«è®Ÿè®¡æ¥æ¥ååç§æ件ååšçé®é¢ïŒæ¯åŠæ件猺å°æ°æ®åæè
å¯æ¬æ°ç®äžå€ãäžåäºåšæ¬å°æ件系ç»äžäŒ ç»çfsckå·¥å
·ïŒè¿äžªåœä»€å¹¶äžäŒä¿®æ£å®æ£æµå°çé误ãäžè¬æ¥è¯ŽïŒNameNodeäŒèªåšä¿®æ£å€§å€æ°å¯æ¢å€çé误ãHDFSçfsckäžæ¯äžäžªHadoop shellåœä»€ãå®éè¿'<span class="codefrag">bin/hadoop fsck</span>'æ§è¡ã |
---|
| 589 | <!--DCCOMMENT:diff begin--> |
---|
| 590 | åœä»€ç䜿çšæ¹æ³è¯·åè<a href="commands_manual.html#fsck"><span class="codefrag">fsck</span>åœä»€</a> |
---|
| 591 | <span class="codefrag">fsck</span>å¯çšæ¥æ£æ¥æŽäžªæ件系ç»ïŒä¹å¯ä»¥åªæ£æ¥éšåæ件ã |
---|
| 592 | <!--DCCOMMENT:diff end |
---|
| 593 | Hadoop shell command. It can be run as '<code>bin/hadoop fsck</code>'. |
---|
| 594 | - Fsck can be run on the whole filesystem or on a subset of files. |
---|
| 595 | + For command usage, see <a href="commands_manual.html#fsck"><code>fsck</code> command</a>. |
---|
| 596 | + <code>fsck</code> can be run on the whole file system or on a subset of files. |
---|
| 597 | </p> |
---|
| 598 | |
---|
| 599 | --> |
---|
| 600 | </p> |
---|
| 601 | </div> |
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| 602 | <a name="N101BF"></a><a name="%E5%8D%87%E7%BA%A7%E5%92%8C%E5%9B%9E%E6%BB%9A"></a> |
---|
| 603 | <h2 class="h3"> å级ååæ» </h2> |
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| 604 | <div class="section"> |
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| 674 | </li> |
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| 675 | <!--DCCOMMENT:diff begin--> |
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| 676 | <!--DCCOMMENT:diff end |
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| 677 | @@ -411,6 +469,10 @@ |
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| 678 | It includes brief |
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| 679 | description of most of the configuration variables available. |
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| 680 | </li> |
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| 681 | + <li> |
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| 682 | + <a href="commands_manual.html">Commands Manual</a> |
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| 683 | + : commands usage. |
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| 684 | + </li> |
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| 685 | </ul> |
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| 686 | </section> |
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| 687 | |
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| 688 | --> |
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| 707 | // --></script> |
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| 709 | <div class="copyright"> |
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| 710 | Copyright © |
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| 711 | 2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
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