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225 | </div> |
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226 | <h1>Quick Start</h1> |
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227 | <div id="minitoc-area"> |
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228 | <ul class="minitoc"> |
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229 | <li> |
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230 | <a href="#Purpose">Purpose</a> |
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231 | </li> |
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232 | <li> |
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233 | <a href="#PreReqs">Pre-requisites</a> |
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234 | <ul class="minitoc"> |
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235 | <li> |
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236 | <a href="#Supported+Platforms">Supported Platforms</a> |
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237 | </li> |
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238 | <li> |
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239 | <a href="#Required+Software">Required Software</a> |
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240 | </li> |
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241 | <li> |
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242 | <a href="#Installing+Software">Installing Software</a> |
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243 | </li> |
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244 | </ul> |
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245 | </li> |
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246 | <li> |
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247 | <a href="#Download">Download</a> |
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248 | </li> |
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249 | <li> |
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250 | <a href="#Prepare+to+Start+the+Hadoop+Cluster">Prepare to Start the Hadoop Cluster</a> |
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251 | </li> |
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252 | <li> |
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253 | <a href="#Local">Standalone Operation</a> |
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254 | </li> |
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255 | <li> |
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256 | <a href="#PseudoDistributed">Pseudo-Distributed Operation</a> |
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257 | <ul class="minitoc"> |
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258 | <li> |
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259 | <a href="#Configuration">Configuration</a> |
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260 | </li> |
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261 | <li> |
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262 | <a href="#Setup+passphraseless">Setup passphraseless ssh</a> |
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263 | </li> |
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264 | <li> |
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265 | <a href="#Execution">Execution</a> |
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266 | </li> |
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267 | </ul> |
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268 | </li> |
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269 | <li> |
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270 | <a href="#FullyDistributed">Fully-Distributed Operation</a> |
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271 | </li> |
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272 | </ul> |
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273 | </div> |
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274 | |
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275 | |
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276 | <a name="N1000D"></a><a name="Purpose"></a> |
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277 | <h2 class="h3">Purpose</h2> |
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278 | <div class="section"> |
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279 | <p>The purpose of this document is to help you get a single-node Hadoop |
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280 | installation up and running very quickly so that you can get a flavour |
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281 | of the Hadoop Distributed File System |
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282 | (see <a href="hdfs_design.html"> <acronym title="Hadoop Distributed File System">HDFS</acronym> Architecture</a>) and |
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283 | the Map/Reduce framework; that is, perform simple operations on HDFS and |
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284 | run example jobs.</p> |
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285 | </div> |
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286 | |
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287 | |
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288 | <a name="N1001F"></a><a name="PreReqs"></a> |
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289 | <h2 class="h3">Pre-requisites</h2> |
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290 | <div class="section"> |
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291 | <a name="N10025"></a><a name="Supported+Platforms"></a> |
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292 | <h3 class="h4">Supported Platforms</h3> |
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293 | <ul> |
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294 | |
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295 | <li> |
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296 | GNU/Linux is supported as a development and production platform. |
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297 | Hadoop has been demonstrated on GNU/Linux clusters with 2000 nodes. |
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298 | </li> |
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299 | |
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300 | <li> |
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301 | Win32 is supported as a <em>development platform</em>. Distributed |
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302 | operation has not been well tested on Win32, so it is not |
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303 | supported as a <em>production platform</em>. |
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304 | </li> |
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305 | |
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306 | </ul> |
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307 | <a name="N1003B"></a><a name="Required+Software"></a> |
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308 | <h3 class="h4">Required Software</h3> |
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309 | <p>Required software for Linux and Windows include:</p> |
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310 | <ol> |
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311 | |
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312 | <li> |
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313 | Java<sup>TM</sup> 1.6.x, preferably from Sun, must be installed. |
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314 | </li> |
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315 | |
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316 | <li> |
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317 | |
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318 | <strong>ssh</strong> must be installed and <strong>sshd</strong> must |
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319 | be running to use the Hadoop scripts that manage remote Hadoop |
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320 | daemons. |
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321 | </li> |
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322 | |
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323 | </ol> |
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324 | <p>Additional requirements for Windows include:</p> |
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325 | <ol> |
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326 | |
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327 | <li> |
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328 | |
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329 | <a href="http://www.cygwin.com/">Cygwin</a> - Required for shell |
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330 | support in addition to the required software above. |
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331 | </li> |
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332 | |
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333 | </ol> |
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334 | <a name="N10064"></a><a name="Installing+Software"></a> |
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335 | <h3 class="h4">Installing Software</h3> |
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336 | <p>If your cluster doesn't have the requisite software you will need to |
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337 | install it.</p> |
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338 | <p>For example on Ubuntu Linux:</p> |
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339 | <p> |
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340 | |
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341 | <span class="codefrag">$ sudo apt-get install ssh</span> |
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342 | <br> |
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343 | |
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344 | <span class="codefrag">$ sudo apt-get install rsync</span> |
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345 | |
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346 | </p> |
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347 | <p>On Windows, if you did not install the required software when you |
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348 | installed cygwin, start the cygwin installer and select the packages:</p> |
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349 | <ul> |
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350 | |
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351 | <li>openssh - the <em>Net</em> category</li> |
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352 | |
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353 | </ul> |
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354 | </div> |
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355 | |
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356 | |
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357 | <a name="N10088"></a><a name="Download"></a> |
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358 | <h2 class="h3">Download</h2> |
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359 | <div class="section"> |
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360 | <p> |
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361 | To get a Hadoop distribution, download a recent |
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362 | <a href="http://hadoop.apache.org/core/releases.html">stable release</a> from one of the Apache Download |
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363 | Mirrors. |
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364 | </p> |
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365 | </div> |
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366 | |
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367 | |
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368 | <a name="N10096"></a><a name="Prepare+to+Start+the+Hadoop+Cluster"></a> |
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369 | <h2 class="h3">Prepare to Start the Hadoop Cluster</h2> |
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370 | <div class="section"> |
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371 | <p> |
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372 | Unpack the downloaded Hadoop distribution. In the distribution, edit the |
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373 | file <span class="codefrag">conf/hadoop-env.sh</span> to define at least |
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374 | <span class="codefrag">JAVA_HOME</span> to be the root of your Java installation. |
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375 | </p> |
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376 | <p> |
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377 | Try the following command:<br> |
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378 | |
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379 | <span class="codefrag">$ bin/hadoop</span> |
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380 | <br> |
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381 | This will display the usage documentation for the <strong>hadoop</strong> |
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382 | script. |
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383 | </p> |
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384 | <p>Now you are ready to start your Hadoop cluster in one of the three supported |
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385 | modes: |
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386 | </p> |
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387 | <ul> |
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388 | |
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389 | <li>Local (Standalone) Mode</li> |
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390 | |
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391 | <li>Pseudo-Distributed Mode</li> |
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392 | |
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393 | <li>Fully-Distributed Mode</li> |
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394 | |
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395 | </ul> |
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396 | </div> |
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397 | |
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398 | |
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399 | <a name="N100C1"></a><a name="Local"></a> |
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400 | <h2 class="h3">Standalone Operation</h2> |
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401 | <div class="section"> |
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402 | <p>By default, Hadoop is configured to run in a non-distributed |
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403 | mode, as a single Java process. This is useful for debugging.</p> |
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404 | <p> |
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405 | The following example copies the unpacked <span class="codefrag">conf</span> directory to |
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406 | use as input and then finds and displays every match of the given regular |
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407 | expression. Output is written to the given <span class="codefrag">output</span> directory. |
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408 | <br> |
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409 | |
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410 | <span class="codefrag">$ mkdir input</span> |
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411 | <br> |
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412 | |
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413 | <span class="codefrag">$ cp conf/*.xml input</span> |
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414 | <br> |
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415 | |
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416 | <span class="codefrag"> |
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417 | $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+' |
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418 | </span> |
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419 | <br> |
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420 | |
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421 | <span class="codefrag">$ cat output/*</span> |
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422 | |
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423 | </p> |
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424 | </div> |
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425 | |
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426 | |
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427 | <a name="N100E5"></a><a name="PseudoDistributed"></a> |
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428 | <h2 class="h3">Pseudo-Distributed Operation</h2> |
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429 | <div class="section"> |
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430 | <p>Hadoop can also be run on a single-node in a pseudo-distributed mode |
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431 | where each Hadoop daemon runs in a separate Java process.</p> |
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432 | <a name="N100EE"></a><a name="Configuration"></a> |
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433 | <h3 class="h4">Configuration</h3> |
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434 | <p>Use the following: |
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435 | <br> |
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436 | |
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437 | <span class="codefrag">conf/core-site.xml</span>:</p> |
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438 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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439 | |
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440 | <tr> |
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441 | <td colspan="1" rowspan="1"><configuration></td> |
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442 | </tr> |
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443 | |
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444 | |
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445 | <tr> |
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446 | <td colspan="1" rowspan="1"> <property></td> |
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447 | </tr> |
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448 | |
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449 | <tr> |
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450 | <td colspan="1" rowspan="1"> <name>fs.default.name</name></td> |
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451 | </tr> |
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452 | |
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453 | <tr> |
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454 | <td colspan="1" rowspan="1"> <value>hdfs://localhost:9000</value></td> |
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455 | </tr> |
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456 | |
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457 | <tr> |
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458 | <td colspan="1" rowspan="1"> </property></td> |
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459 | </tr> |
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460 | |
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461 | |
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462 | <tr> |
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463 | <td colspan="1" rowspan="1"></configuration></td> |
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464 | </tr> |
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465 | |
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466 | </table> |
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467 | <p> |
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468 | <br> |
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469 | <span class="codefrag">conf/hdfs-site.xml</span>:</p> |
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470 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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471 | |
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472 | <tr> |
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473 | <td colspan="1" rowspan="1"><configuration></td> |
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474 | </tr> |
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475 | |
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476 | |
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477 | <tr> |
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478 | <td colspan="1" rowspan="1"> <property></td> |
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479 | </tr> |
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480 | |
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481 | <tr> |
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482 | <td colspan="1" rowspan="1"> <name>dfs.replication</name></td> |
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483 | </tr> |
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484 | |
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485 | <tr> |
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486 | <td colspan="1" rowspan="1"> <value>1</value></td> |
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487 | </tr> |
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488 | |
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489 | <tr> |
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490 | <td colspan="1" rowspan="1"> </property></td> |
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491 | </tr> |
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492 | |
---|
493 | |
---|
494 | <tr> |
---|
495 | <td colspan="1" rowspan="1"></configuration></td> |
---|
496 | </tr> |
---|
497 | |
---|
498 | </table> |
---|
499 | <p> |
---|
500 | <br> |
---|
501 | <span class="codefrag">conf/mapred-site.xml</span>:</p> |
---|
502 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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503 | |
---|
504 | <tr> |
---|
505 | <td colspan="1" rowspan="1"><configuration></td> |
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506 | </tr> |
---|
507 | |
---|
508 | |
---|
509 | <tr> |
---|
510 | <td colspan="1" rowspan="1"> <property></td> |
---|
511 | </tr> |
---|
512 | |
---|
513 | <tr> |
---|
514 | <td colspan="1" rowspan="1"> <name>mapred.job.tracker</name></td> |
---|
515 | </tr> |
---|
516 | |
---|
517 | <tr> |
---|
518 | <td colspan="1" rowspan="1"> <value>localhost:9001</value></td> |
---|
519 | </tr> |
---|
520 | |
---|
521 | <tr> |
---|
522 | <td colspan="1" rowspan="1"> </property></td> |
---|
523 | </tr> |
---|
524 | |
---|
525 | |
---|
526 | <tr> |
---|
527 | <td colspan="1" rowspan="1"></configuration></td> |
---|
528 | </tr> |
---|
529 | |
---|
530 | </table> |
---|
531 | <a name="N1017E"></a><a name="Setup+passphraseless"></a> |
---|
532 | <h3 class="h4">Setup passphraseless ssh</h3> |
---|
533 | <p> |
---|
534 | Now check that you can ssh to the localhost without a passphrase:<br> |
---|
535 | |
---|
536 | <span class="codefrag">$ ssh localhost</span> |
---|
537 | |
---|
538 | </p> |
---|
539 | <p> |
---|
540 | If you cannot ssh to localhost without a passphrase, execute the |
---|
541 | following commands:<br> |
---|
542 | |
---|
543 | <span class="codefrag">$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa</span> |
---|
544 | <br> |
---|
545 | |
---|
546 | <span class="codefrag">$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys</span> |
---|
547 | |
---|
548 | </p> |
---|
549 | <a name="N1019B"></a><a name="Execution"></a> |
---|
550 | <h3 class="h4">Execution</h3> |
---|
551 | <p> |
---|
552 | Format a new distributed-filesystem:<br> |
---|
553 | |
---|
554 | <span class="codefrag">$ bin/hadoop namenode -format</span> |
---|
555 | |
---|
556 | </p> |
---|
557 | <p> |
---|
558 | Start the hadoop daemons:<br> |
---|
559 | |
---|
560 | <span class="codefrag">$ bin/start-all.sh</span> |
---|
561 | |
---|
562 | </p> |
---|
563 | <p>The hadoop daemon log output is written to the |
---|
564 | <span class="codefrag">${HADOOP_LOG_DIR}</span> directory (defaults to |
---|
565 | <span class="codefrag">${HADOOP_HOME}/logs</span>).</p> |
---|
566 | <p>Browse the web interface for the NameNode and the JobTracker; by |
---|
567 | default they are available at:</p> |
---|
568 | <ul> |
---|
569 | |
---|
570 | <li> |
---|
571 | |
---|
572 | <span class="codefrag">NameNode</span> - |
---|
573 | <a href="http://localhost:50070/">http://localhost:50070/</a> |
---|
574 | |
---|
575 | </li> |
---|
576 | |
---|
577 | <li> |
---|
578 | |
---|
579 | <span class="codefrag">JobTracker</span> - |
---|
580 | <a href="http://localhost:50030/">http://localhost:50030/</a> |
---|
581 | |
---|
582 | </li> |
---|
583 | |
---|
584 | </ul> |
---|
585 | <p> |
---|
586 | Copy the input files into the distributed filesystem:<br> |
---|
587 | |
---|
588 | <span class="codefrag">$ bin/hadoop fs -put conf input</span> |
---|
589 | |
---|
590 | </p> |
---|
591 | <p> |
---|
592 | Run some of the examples provided:<br> |
---|
593 | |
---|
594 | <span class="codefrag"> |
---|
595 | $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+' |
---|
596 | </span> |
---|
597 | |
---|
598 | </p> |
---|
599 | <p>Examine the output files:</p> |
---|
600 | <p> |
---|
601 | Copy the output files from the distributed filesystem to the local |
---|
602 | filesytem and examine them:<br> |
---|
603 | |
---|
604 | <span class="codefrag">$ bin/hadoop fs -get output output</span> |
---|
605 | <br> |
---|
606 | |
---|
607 | <span class="codefrag">$ cat output/*</span> |
---|
608 | |
---|
609 | </p> |
---|
610 | <p> or </p> |
---|
611 | <p> |
---|
612 | View the output files on the distributed filesystem:<br> |
---|
613 | |
---|
614 | <span class="codefrag">$ bin/hadoop fs -cat output/*</span> |
---|
615 | |
---|
616 | </p> |
---|
617 | <p> |
---|
618 | When you're done, stop the daemons with:<br> |
---|
619 | |
---|
620 | <span class="codefrag">$ bin/stop-all.sh</span> |
---|
621 | |
---|
622 | </p> |
---|
623 | </div> |
---|
624 | |
---|
625 | |
---|
626 | <a name="N10208"></a><a name="FullyDistributed"></a> |
---|
627 | <h2 class="h3">Fully-Distributed Operation</h2> |
---|
628 | <div class="section"> |
---|
629 | <p>For information on setting up fully-distributed, non-trivial clusters |
---|
630 | see <a href="cluster_setup.html">Hadoop Cluster Setup</a>.</p> |
---|
631 | </div> |
---|
632 | |
---|
633 | |
---|
634 | <p> |
---|
635 | |
---|
636 | <em>Java and JNI are trademarks or registered trademarks of |
---|
637 | Sun Microsystems, Inc. in the United States and other countries.</em> |
---|
638 | |
---|
639 | </p> |
---|
640 | |
---|
641 | |
---|
642 | </div> |
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643 | <!--+ |
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644 | |end content |
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645 | +--> |
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646 | <div class="clearboth"> </div> |
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647 | </div> |
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648 | <div id="footer"> |
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649 | <!--+ |
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650 | |start bottomstrip |
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651 | +--> |
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652 | <div class="lastmodified"> |
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653 | <script type="text/javascript"><!-- |
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654 | document.write("Last Published: " + document.lastModified); |
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655 | // --></script> |
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656 | </div> |
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657 | <div class="copyright"> |
---|
658 | Copyright © |
---|
659 | 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
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660 | </div> |
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661 | <!--+ |
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662 | |end bottomstrip |
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663 | +--> |
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664 | </div> |
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665 | </body> |
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666 | </html> |
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