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195 | <h1> |
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196 | HadoopååžåŒæ件系ç»äœ¿çšæå |
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197 | </h1> |
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204 | <a href="#%E6%A6%82%E8%BF%B0"> æŠè¿° </a> |
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205 | </li> |
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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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208 | </li> |
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209 | <li> |
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210 | <a href="#Web%E6%8E%A5%E5%8F%A3"> Webæ¥å£ </a> |
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212 | <li> |
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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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228 | </li> |
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229 | <li> |
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230 | <a href="#%E5%AE%89%E5%85%A8%E6%A8%A1%E5%BC%8F"> å®å
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, |
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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. |
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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 |
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322 | - interest to many users. The terms in <em>italics</em> |
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323 | - are described in later sections. |
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324 | + interest to many users. |
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325 | </p> |
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326 | <ul> |
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327 | <li> |
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328 | --> |
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329 | HadoopïŒå
æ¬HDFSïŒéåžžéååšåçšç¡¬ä»¶ïŒcommodity hardwareïŒäžåååžåŒååšå计ç®ïŒå 䞺å®äžä»
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·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
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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. |
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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. |
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359 | </li> |
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360 | <li> |
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361 | - Namenode and Datanodes have built in web servers that makes it |
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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 |
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378 | </li> |
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379 | |
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380 | <li> |
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381 | å®å
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382 | </li> |
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383 | |
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384 | <li> |
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385 | fsckïŒäžäžªè¯ææ件系ç»å¥åº·ç¶åµçå·¥å
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386 | </li> |
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387 | |
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388 | <li> |
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389 | RebalancerïŒåœdatanodeä¹éŽæ°æ®äžåè¡¡æ¶ïŒå¹³è¡¡é矀äžçæ°æ®èŽèœœã |
---|
390 | </li> |
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391 | |
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393 | å级ååæ»ïŒåšèœ¯ä»¶æŽæ°åæåŒåžžåççæ
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394 | </li> |
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395 | |
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396 | <li> |
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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 |
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398 | </li> |
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399 | |
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400 | </ul> |
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401 | |
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402 | </li> |
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403 | |
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404 | </ul> |
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405 | </div> |
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406 | <a name="N10071"></a><a name="%E5%85%88%E5%86%B3%E6%9D%A1%E4%BB%B6"></a> |
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407 | <h2 class="h3"> å
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408 | <div class="section"> |
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409 | <p> |
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410 | äžé¢çææ¡£æè¿°äºåŠäœå®è£
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411 | </p> |
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412 | <ul> |
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413 | |
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414 | <li> |
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415 | |
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416 | <a href="quickstart.html">Hadoopå¿«éå
¥éš</a> |
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417 | é对å次䜿çšè
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418 | </li> |
---|
419 | |
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420 | <li> |
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421 | |
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422 | <a href="cluster_setup.html">Hadoopé矀æ建</a> |
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423 | é对倧è§æš¡ååžåŒé矀çæ建ã |
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424 | </li> |
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425 | |
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426 | </ul> |
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427 | <p> |
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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> |
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516 | åšé
眮åæ°<span class="codefrag">dfs.name.dir</span>æå®çäœçœ®å»ºç«äžäžªç©ºæä»¶å€¹ïŒ |
---|
517 | </li> |
---|
518 | |
---|
519 | <li> |
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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> |
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547 | å°æ°æ®åçäžäžªå¯æ¬æŸåšæ£åšåè¿äžªæ°æ®åçèç¹äžã |
---|
548 | </li> |
---|
549 | |
---|
550 | <li> |
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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> |
---|
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> |
---|
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
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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
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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> |
---|
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> |
---|
604 | <div class="section"> |
---|
605 | <p>åœåšäžäžªå·²æé矀äžå级Hadoopæ¶ïŒåå
¶ä»ç蜯件å级äžæ ·ïŒå¯èœäŒææ°çbugæäžäºäŒåœ±åå°ç°æåºçšçéå
Œå®¹æ§åæŽåºç°ãåšä»»äœæå®é
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讞çïŒæŽäžçšè¯Žéæ°æ建å¯åšHDFSäºãHDFSå
讞管çåéåå°ä¹åçHadoopçæ¬ïŒå¹¶å°é矀çç¶æåæ»å°å级ä¹åãæŽå€å
³äºHDFSå级çç»èåš<a href="http://wiki.apache.org/hadoop/Hadoop%20Upgrade">å级wiki</a>äžå¯ä»¥æŸå°ãHDFSåšäžäžªæ¶éŽå¯ä»¥æäžäžªè¿æ ·çå€ä»œãåšå级ä¹åïŒç®¡çåéèŠçš<span class="codefrag">bin/hadoop dfsadmin -finalizeUpgrade</span>ïŒå级ç»ç»æäœïŒåœä»€å é€ååšçå€ä»œæ件ãäžé¢ç®åä»ç»äžäžäžè¬çå级è¿çšïŒ |
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606 | </p> |
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607 | <ul> |
---|
608 | |
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674 | </li> |
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675 | <!--DCCOMMENT:diff begin--> |
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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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689 | |
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691 | </div> |
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692 | |
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693 | |
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694 | </div> |
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695 | <!--+ |
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706 | document.write("Last Published: " + document.lastModified); |
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707 | // --></script> |
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