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225 | </div> |
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226 | <h1>Commands Guide</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="#Overview">Overview</a> |
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231 | <ul class="minitoc"> |
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232 | <li> |
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233 | <a href="#Generic+Options">Generic Options</a> |
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234 | </li> |
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235 | </ul> |
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236 | </li> |
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237 | <li> |
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238 | <a href="#User+Commands"> User Commands </a> |
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239 | <ul class="minitoc"> |
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240 | <li> |
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241 | <a href="#archive"> archive </a> |
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242 | </li> |
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243 | <li> |
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244 | <a href="#distcp"> distcp </a> |
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245 | </li> |
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246 | <li> |
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247 | <a href="#fs"> fs </a> |
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248 | </li> |
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249 | <li> |
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250 | <a href="#fsck"> fsck </a> |
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251 | </li> |
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252 | <li> |
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253 | <a href="#jar"> jar </a> |
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254 | </li> |
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255 | <li> |
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256 | <a href="#job"> job </a> |
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257 | </li> |
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258 | <li> |
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259 | <a href="#pipes"> pipes </a> |
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260 | </li> |
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261 | <li> |
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262 | <a href="#queue"> queue </a> |
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263 | </li> |
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264 | <li> |
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265 | <a href="#version"> version </a> |
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266 | </li> |
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267 | <li> |
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268 | <a href="#CLASSNAME"> CLASSNAME </a> |
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269 | </li> |
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270 | </ul> |
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271 | </li> |
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272 | <li> |
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273 | <a href="#Administration+Commands"> Administration Commands </a> |
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274 | <ul class="minitoc"> |
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275 | <li> |
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276 | <a href="#balancer"> balancer </a> |
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277 | </li> |
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278 | <li> |
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279 | <a href="#daemonlog"> daemonlog </a> |
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280 | </li> |
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281 | <li> |
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282 | <a href="#datanode"> datanode</a> |
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283 | </li> |
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284 | <li> |
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285 | <a href="#dfsadmin"> dfsadmin </a> |
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286 | </li> |
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287 | <li> |
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288 | <a href="#jobtracker"> jobtracker </a> |
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289 | </li> |
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290 | <li> |
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291 | <a href="#namenode"> namenode </a> |
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292 | </li> |
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293 | <li> |
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294 | <a href="#secondarynamenode"> secondarynamenode </a> |
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295 | </li> |
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296 | <li> |
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297 | <a href="#tasktracker"> tasktracker </a> |
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298 | </li> |
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299 | </ul> |
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300 | </li> |
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301 | </ul> |
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302 | </div> |
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303 | |
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304 | <a name="N1000D"></a><a name="Overview"></a> |
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305 | <h2 class="h3">Overview</h2> |
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306 | <div class="section"> |
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307 | <p> |
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308 | All hadoop commands are invoked by the bin/hadoop script. Running the hadoop |
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309 | script without any arguments prints the description for all commands. |
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310 | </p> |
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311 | <p> |
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312 | |
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313 | <span class="codefrag">Usage: hadoop [--config confdir] [COMMAND] [GENERIC_OPTIONS] [COMMAND_OPTIONS]</span> |
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314 | |
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315 | </p> |
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316 | <p> |
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317 | Hadoop has an option parsing framework that employs parsing generic options as well as running classes. |
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318 | </p> |
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319 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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320 | |
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321 | <tr> |
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322 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
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323 | </tr> |
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324 | |
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325 | |
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326 | <tr> |
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327 | |
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328 | <td colspan="1" rowspan="1"><span class="codefrag">--config confdir</span></td> |
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329 | <td colspan="1" rowspan="1">Overwrites the default Configuration directory. Default is ${HADOOP_HOME}/conf.</td> |
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330 | |
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331 | </tr> |
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332 | |
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333 | <tr> |
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334 | |
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335 | <td colspan="1" rowspan="1"><span class="codefrag">GENERIC_OPTIONS</span></td> |
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336 | <td colspan="1" rowspan="1">The common set of options supported by multiple commands.</td> |
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337 | |
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338 | </tr> |
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339 | |
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340 | <tr> |
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341 | |
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342 | <td colspan="1" rowspan="1"><span class="codefrag">COMMAND</span> |
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343 | <br> |
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344 | <span class="codefrag">COMMAND_OPTIONS</span></td> |
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345 | <td colspan="1" rowspan="1">Various commands with their options are described in the following sections. The commands |
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346 | have been grouped into <a href="commands_manual.html#User+Commands">User Commands</a> |
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347 | and <a href="commands_manual.html#Administration+Commands">Administration Commands</a>.</td> |
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348 | |
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349 | </tr> |
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350 | |
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351 | </table> |
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352 | <a name="N10061"></a><a name="Generic+Options"></a> |
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353 | <h3 class="h4">Generic Options</h3> |
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354 | <p> |
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355 | The following options are supported by <a href="commands_manual.html#dfsadmin">dfsadmin</a>, |
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356 | <a href="commands_manual.html#fs">fs</a>, <a href="commands_manual.html#fsck">fsck</a> and |
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357 | <a href="commands_manual.html#job">job</a>. |
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358 | Applications should implement |
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359 | <a href="api/org/apache/hadoop/util/Tool.html">Tool</a> to support |
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360 | <a href="api/org/apache/hadoop/util/GenericOptionsParser.html"> |
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361 | GenericOptions</a>. |
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362 | </p> |
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363 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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364 | |
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365 | <tr> |
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366 | <th colspan="1" rowspan="1"> GENERIC_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
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367 | </tr> |
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368 | |
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369 | |
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370 | <tr> |
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371 | |
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372 | <td colspan="1" rowspan="1"><span class="codefrag">-conf <configuration file></span></td> |
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373 | <td colspan="1" rowspan="1">Specify an application configuration file.</td> |
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374 | |
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375 | </tr> |
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376 | |
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377 | <tr> |
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378 | |
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379 | <td colspan="1" rowspan="1"><span class="codefrag">-D <property=value></span></td> |
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380 | <td colspan="1" rowspan="1">Use value for given property.</td> |
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381 | |
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382 | </tr> |
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383 | |
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384 | <tr> |
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385 | |
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386 | <td colspan="1" rowspan="1"><span class="codefrag">-fs <local|namenode:port></span></td> |
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387 | <td colspan="1" rowspan="1">Specify a namenode.</td> |
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388 | |
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389 | </tr> |
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390 | |
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391 | <tr> |
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392 | |
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393 | <td colspan="1" rowspan="1"><span class="codefrag">-jt <local|jobtracker:port></span></td> |
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394 | <td colspan="1" rowspan="1">Specify a job tracker. Applies only to <a href="commands_manual.html#job">job</a>.</td> |
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395 | |
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396 | </tr> |
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397 | |
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398 | <tr> |
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399 | |
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400 | <td colspan="1" rowspan="1"><span class="codefrag">-files <comma separated list of files></span></td> |
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401 | <td colspan="1" rowspan="1">Specify comma separated files to be copied to the map reduce cluster. |
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402 | Applies only to <a href="commands_manual.html#job">job</a>.</td> |
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403 | |
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404 | </tr> |
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405 | |
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406 | <tr> |
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407 | |
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408 | <td colspan="1" rowspan="1"><span class="codefrag">-libjars <comma seperated list of jars></span></td> |
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409 | <td colspan="1" rowspan="1">Specify comma separated jar files to include in the classpath. |
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410 | Applies only to <a href="commands_manual.html#job">job</a>.</td> |
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411 | |
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412 | </tr> |
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413 | |
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414 | <tr> |
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415 | |
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416 | <td colspan="1" rowspan="1"><span class="codefrag">-archives <comma separated list of archives></span></td> |
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417 | <td colspan="1" rowspan="1">Specify comma separated archives to be unarchived on the compute machines. |
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418 | Applies only to <a href="commands_manual.html#job">job</a>.</td> |
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419 | |
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420 | </tr> |
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421 | |
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422 | </table> |
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423 | </div> |
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424 | |
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425 | |
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426 | <a name="N10103"></a><a name="User+Commands"></a> |
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427 | <h2 class="h3"> User Commands </h2> |
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428 | <div class="section"> |
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429 | <p>Commands useful for users of a hadoop cluster.</p> |
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430 | <a name="N1010C"></a><a name="archive"></a> |
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431 | <h3 class="h4"> archive </h3> |
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432 | <p> |
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433 | Creates a hadoop archive. More information can be found at <a href="hadoop_archives.html">Hadoop Archives</a>. |
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434 | </p> |
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435 | <p> |
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436 | |
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437 | <span class="codefrag">Usage: hadoop archive -archiveName NAME <src>* <dest></span> |
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438 | |
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439 | </p> |
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440 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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441 | |
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442 | <tr> |
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443 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
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444 | </tr> |
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445 | |
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446 | <tr> |
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447 | |
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448 | <td colspan="1" rowspan="1"><span class="codefrag">-archiveName NAME</span></td> |
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449 | <td colspan="1" rowspan="1">Name of the archive to be created.</td> |
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450 | |
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451 | </tr> |
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452 | |
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453 | <tr> |
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454 | |
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455 | <td colspan="1" rowspan="1"><span class="codefrag">src</span></td> |
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456 | <td colspan="1" rowspan="1">Filesystem pathnames which work as usual with regular expressions.</td> |
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457 | |
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458 | </tr> |
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459 | |
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460 | <tr> |
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461 | |
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462 | <td colspan="1" rowspan="1"><span class="codefrag">dest</span></td> |
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463 | <td colspan="1" rowspan="1">Destination directory which would contain the archive.</td> |
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464 | |
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465 | </tr> |
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466 | |
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467 | </table> |
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468 | <a name="N10157"></a><a name="distcp"></a> |
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469 | <h3 class="h4"> distcp </h3> |
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470 | <p> |
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471 | Copy file or directories recursively. More information can be found at <a href="distcp.html">Hadoop DistCp Guide</a>. |
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472 | </p> |
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473 | <p> |
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474 | |
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475 | <span class="codefrag">Usage: hadoop distcp <srcurl> <desturl></span> |
---|
476 | |
---|
477 | </p> |
---|
478 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
479 | |
---|
480 | <tr> |
---|
481 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
482 | </tr> |
---|
483 | |
---|
484 | |
---|
485 | <tr> |
---|
486 | |
---|
487 | <td colspan="1" rowspan="1"><span class="codefrag">srcurl</span></td> |
---|
488 | <td colspan="1" rowspan="1">Source Url</td> |
---|
489 | |
---|
490 | </tr> |
---|
491 | |
---|
492 | <tr> |
---|
493 | |
---|
494 | <td colspan="1" rowspan="1"><span class="codefrag">desturl</span></td> |
---|
495 | <td colspan="1" rowspan="1">Destination Url</td> |
---|
496 | |
---|
497 | </tr> |
---|
498 | |
---|
499 | </table> |
---|
500 | <a name="N10194"></a><a name="fs"></a> |
---|
501 | <h3 class="h4"> fs </h3> |
---|
502 | <p> |
---|
503 | |
---|
504 | <span class="codefrag">Usage: hadoop fs [</span><a href="commands_manual.html#Generic+Options">GENERIC_OPTIONS</a><span class="codefrag">] |
---|
505 | [COMMAND_OPTIONS]</span> |
---|
506 | |
---|
507 | </p> |
---|
508 | <p> |
---|
509 | Runs a generic filesystem user client. |
---|
510 | </p> |
---|
511 | <p> |
---|
512 | The various COMMAND_OPTIONS can be found at <a href="hdfs_shell.html">Hadoop FS Shell Guide</a>. |
---|
513 | </p> |
---|
514 | <a name="N101B0"></a><a name="fsck"></a> |
---|
515 | <h3 class="h4"> fsck </h3> |
---|
516 | <p> |
---|
517 | Runs a HDFS filesystem checking utility. See <a href="hdfs_user_guide.html#Fsck">Fsck</a> for more info. |
---|
518 | </p> |
---|
519 | <p> |
---|
520 | <span class="codefrag">Usage: hadoop fsck [</span><a href="commands_manual.html#Generic+Options">GENERIC_OPTIONS</a><span class="codefrag">] |
---|
521 | <path> [-move | -delete | -openforwrite] [-files [-blocks |
---|
522 | [-locations | -racks]]]</span> |
---|
523 | </p> |
---|
524 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
525 | |
---|
526 | <tr> |
---|
527 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
528 | </tr> |
---|
529 | |
---|
530 | <tr> |
---|
531 | |
---|
532 | <td colspan="1" rowspan="1"><span class="codefrag"><path></span></td> |
---|
533 | <td colspan="1" rowspan="1">Start checking from this path.</td> |
---|
534 | |
---|
535 | </tr> |
---|
536 | |
---|
537 | <tr> |
---|
538 | |
---|
539 | <td colspan="1" rowspan="1"><span class="codefrag">-move</span></td> |
---|
540 | <td colspan="1" rowspan="1">Move corrupted files to /lost+found</td> |
---|
541 | |
---|
542 | </tr> |
---|
543 | |
---|
544 | <tr> |
---|
545 | |
---|
546 | <td colspan="1" rowspan="1"><span class="codefrag">-delete</span></td> |
---|
547 | <td colspan="1" rowspan="1">Delete corrupted files.</td> |
---|
548 | |
---|
549 | </tr> |
---|
550 | |
---|
551 | <tr> |
---|
552 | |
---|
553 | <td colspan="1" rowspan="1"><span class="codefrag">-openforwrite</span></td> |
---|
554 | <td colspan="1" rowspan="1">Print out files opened for write.</td> |
---|
555 | |
---|
556 | </tr> |
---|
557 | |
---|
558 | <tr> |
---|
559 | |
---|
560 | <td colspan="1" rowspan="1"><span class="codefrag">-files</span></td> |
---|
561 | <td colspan="1" rowspan="1">Print out files being checked.</td> |
---|
562 | |
---|
563 | </tr> |
---|
564 | |
---|
565 | <tr> |
---|
566 | |
---|
567 | <td colspan="1" rowspan="1"><span class="codefrag">-blocks</span></td> |
---|
568 | <td colspan="1" rowspan="1">Print out block report.</td> |
---|
569 | |
---|
570 | </tr> |
---|
571 | |
---|
572 | <tr> |
---|
573 | |
---|
574 | <td colspan="1" rowspan="1"><span class="codefrag">-locations</span></td> |
---|
575 | <td colspan="1" rowspan="1">Print out locations for every block.</td> |
---|
576 | |
---|
577 | </tr> |
---|
578 | |
---|
579 | <tr> |
---|
580 | |
---|
581 | <td colspan="1" rowspan="1"><span class="codefrag">-racks</span></td> |
---|
582 | <td colspan="1" rowspan="1">Print out network topology for data-node locations.</td> |
---|
583 | |
---|
584 | </tr> |
---|
585 | |
---|
586 | </table> |
---|
587 | <a name="N10244"></a><a name="jar"></a> |
---|
588 | <h3 class="h4"> jar </h3> |
---|
589 | <p> |
---|
590 | Runs a jar file. Users can bundle their Map Reduce code in a jar file and execute it using this command. |
---|
591 | </p> |
---|
592 | <p> |
---|
593 | |
---|
594 | <span class="codefrag">Usage: hadoop jar <jar> [mainClass] args...</span> |
---|
595 | |
---|
596 | </p> |
---|
597 | <p> |
---|
598 | The streaming jobs are run via this command. Examples can be referred from |
---|
599 | <a href="streaming.html#More+usage+examples">Streaming examples</a> |
---|
600 | |
---|
601 | </p> |
---|
602 | <p> |
---|
603 | Word count example is also run using jar command. It can be referred from |
---|
604 | <a href="mapred_tutorial.html#Usage">Wordcount example</a> |
---|
605 | |
---|
606 | </p> |
---|
607 | <a name="N10262"></a><a name="job"></a> |
---|
608 | <h3 class="h4"> job </h3> |
---|
609 | <p> |
---|
610 | Command to interact with Map Reduce Jobs. |
---|
611 | </p> |
---|
612 | <p> |
---|
613 | |
---|
614 | <span class="codefrag">Usage: hadoop job [</span><a href="commands_manual.html#Generic+Options">GENERIC_OPTIONS</a><span class="codefrag">] |
---|
615 | [-submit <job-file>] | [-status <job-id>] | |
---|
616 | [-counter <job-id> <group-name> <counter-name>] | [-kill <job-id>] | |
---|
617 | [-events <job-id> <from-event-#> <#-of-events>] | [-history [all] <jobOutputDir>] | |
---|
618 | [-list [all]] | [-kill-task <task-id>] | [-fail-task <task-id>] | |
---|
619 | [-set-priority <job-id> <priority>]</span> |
---|
620 | |
---|
621 | </p> |
---|
622 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
623 | |
---|
624 | <tr> |
---|
625 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
626 | </tr> |
---|
627 | |
---|
628 | |
---|
629 | <tr> |
---|
630 | |
---|
631 | <td colspan="1" rowspan="1"><span class="codefrag">-submit <job-file></span></td> |
---|
632 | <td colspan="1" rowspan="1">Submits the job.</td> |
---|
633 | |
---|
634 | </tr> |
---|
635 | |
---|
636 | <tr> |
---|
637 | |
---|
638 | <td colspan="1" rowspan="1"><span class="codefrag">-status <job-id></span></td> |
---|
639 | <td colspan="1" rowspan="1">Prints the map and reduce completion percentage and all job counters.</td> |
---|
640 | |
---|
641 | </tr> |
---|
642 | |
---|
643 | <tr> |
---|
644 | |
---|
645 | <td colspan="1" rowspan="1"><span class="codefrag">-counter <job-id> <group-name> <counter-name></span></td> |
---|
646 | <td colspan="1" rowspan="1">Prints the counter value.</td> |
---|
647 | |
---|
648 | </tr> |
---|
649 | |
---|
650 | <tr> |
---|
651 | |
---|
652 | <td colspan="1" rowspan="1"><span class="codefrag">-kill <job-id></span></td> |
---|
653 | <td colspan="1" rowspan="1">Kills the job.</td> |
---|
654 | |
---|
655 | </tr> |
---|
656 | |
---|
657 | <tr> |
---|
658 | |
---|
659 | <td colspan="1" rowspan="1"><span class="codefrag">-events <job-id> <from-event-#> <#-of-events></span></td> |
---|
660 | <td colspan="1" rowspan="1">Prints the events' details received by jobtracker for the given range.</td> |
---|
661 | |
---|
662 | </tr> |
---|
663 | |
---|
664 | <tr> |
---|
665 | |
---|
666 | <td colspan="1" rowspan="1"><span class="codefrag">-history [all] <jobOutputDir></span></td> |
---|
667 | <td colspan="1" rowspan="1">-history <jobOutputDir> prints job details, failed and killed tip details. More details |
---|
668 | about the job such as successful tasks and task attempts made for each task can be viewed by |
---|
669 | specifying the [all] option. </td> |
---|
670 | |
---|
671 | </tr> |
---|
672 | |
---|
673 | <tr> |
---|
674 | |
---|
675 | <td colspan="1" rowspan="1"><span class="codefrag">-list [all]</span></td> |
---|
676 | <td colspan="1" rowspan="1">-list all displays all jobs. -list displays only jobs which are yet to complete.</td> |
---|
677 | |
---|
678 | </tr> |
---|
679 | |
---|
680 | <tr> |
---|
681 | |
---|
682 | <td colspan="1" rowspan="1"><span class="codefrag">-kill-task <task-id></span></td> |
---|
683 | <td colspan="1" rowspan="1">Kills the task. Killed tasks are NOT counted against failed attempts.</td> |
---|
684 | |
---|
685 | </tr> |
---|
686 | |
---|
687 | <tr> |
---|
688 | |
---|
689 | <td colspan="1" rowspan="1"><span class="codefrag">-fail-task <task-id></span></td> |
---|
690 | <td colspan="1" rowspan="1">Fails the task. Failed tasks are counted against failed attempts.</td> |
---|
691 | |
---|
692 | </tr> |
---|
693 | |
---|
694 | <tr> |
---|
695 | |
---|
696 | <td colspan="1" rowspan="1"><span class="codefrag">-set-priority <job-id> <priority></span></td> |
---|
697 | <td colspan="1" rowspan="1">Changes the priority of the job. |
---|
698 | Allowed priority values are VERY_HIGH, HIGH, NORMAL, LOW, VERY_LOW</td> |
---|
699 | |
---|
700 | </tr> |
---|
701 | |
---|
702 | </table> |
---|
703 | <a name="N10310"></a><a name="pipes"></a> |
---|
704 | <h3 class="h4"> pipes </h3> |
---|
705 | <p> |
---|
706 | Runs a pipes job. |
---|
707 | </p> |
---|
708 | <p> |
---|
709 | |
---|
710 | <span class="codefrag">Usage: hadoop pipes [-conf <path>] [-jobconf <key=value>, <key=value>, ...] |
---|
711 | [-input <path>] [-output <path>] [-jar <jar file>] [-inputformat <class>] |
---|
712 | [-map <class>] [-partitioner <class>] [-reduce <class>] [-writer <class>] |
---|
713 | [-program <executable>] [-reduces <num>] </span> |
---|
714 | |
---|
715 | </p> |
---|
716 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
717 | |
---|
718 | <tr> |
---|
719 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
720 | </tr> |
---|
721 | |
---|
722 | |
---|
723 | <tr> |
---|
724 | |
---|
725 | <td colspan="1" rowspan="1"><span class="codefrag">-conf <path></span></td> |
---|
726 | <td colspan="1" rowspan="1">Configuration for job</td> |
---|
727 | |
---|
728 | </tr> |
---|
729 | |
---|
730 | <tr> |
---|
731 | |
---|
732 | <td colspan="1" rowspan="1"><span class="codefrag">-jobconf <key=value>, <key=value>, ...</span></td> |
---|
733 | <td colspan="1" rowspan="1">Add/override configuration for job</td> |
---|
734 | |
---|
735 | </tr> |
---|
736 | |
---|
737 | <tr> |
---|
738 | |
---|
739 | <td colspan="1" rowspan="1"><span class="codefrag">-input <path></span></td> |
---|
740 | <td colspan="1" rowspan="1">Input directory</td> |
---|
741 | |
---|
742 | </tr> |
---|
743 | |
---|
744 | <tr> |
---|
745 | |
---|
746 | <td colspan="1" rowspan="1"><span class="codefrag">-output <path></span></td> |
---|
747 | <td colspan="1" rowspan="1">Output directory</td> |
---|
748 | |
---|
749 | </tr> |
---|
750 | |
---|
751 | <tr> |
---|
752 | |
---|
753 | <td colspan="1" rowspan="1"><span class="codefrag">-jar <jar file></span></td> |
---|
754 | <td colspan="1" rowspan="1">Jar filename</td> |
---|
755 | |
---|
756 | </tr> |
---|
757 | |
---|
758 | <tr> |
---|
759 | |
---|
760 | <td colspan="1" rowspan="1"><span class="codefrag">-inputformat <class></span></td> |
---|
761 | <td colspan="1" rowspan="1">InputFormat class</td> |
---|
762 | |
---|
763 | </tr> |
---|
764 | |
---|
765 | <tr> |
---|
766 | |
---|
767 | <td colspan="1" rowspan="1"><span class="codefrag">-map <class></span></td> |
---|
768 | <td colspan="1" rowspan="1">Java Map class</td> |
---|
769 | |
---|
770 | </tr> |
---|
771 | |
---|
772 | <tr> |
---|
773 | |
---|
774 | <td colspan="1" rowspan="1"><span class="codefrag">-partitioner <class></span></td> |
---|
775 | <td colspan="1" rowspan="1">Java Partitioner</td> |
---|
776 | |
---|
777 | </tr> |
---|
778 | |
---|
779 | <tr> |
---|
780 | |
---|
781 | <td colspan="1" rowspan="1"><span class="codefrag">-reduce <class></span></td> |
---|
782 | <td colspan="1" rowspan="1">Java Reduce class</td> |
---|
783 | |
---|
784 | </tr> |
---|
785 | |
---|
786 | <tr> |
---|
787 | |
---|
788 | <td colspan="1" rowspan="1"><span class="codefrag">-writer <class></span></td> |
---|
789 | <td colspan="1" rowspan="1">Java RecordWriter</td> |
---|
790 | |
---|
791 | </tr> |
---|
792 | |
---|
793 | <tr> |
---|
794 | |
---|
795 | <td colspan="1" rowspan="1"><span class="codefrag">-program <executable></span></td> |
---|
796 | <td colspan="1" rowspan="1">Executable URI</td> |
---|
797 | |
---|
798 | </tr> |
---|
799 | |
---|
800 | <tr> |
---|
801 | |
---|
802 | <td colspan="1" rowspan="1"><span class="codefrag">-reduces <num></span></td> |
---|
803 | <td colspan="1" rowspan="1">Number of reduces</td> |
---|
804 | |
---|
805 | </tr> |
---|
806 | |
---|
807 | </table> |
---|
808 | <a name="N103D5"></a><a name="queue"></a> |
---|
809 | <h3 class="h4"> queue </h3> |
---|
810 | <p> |
---|
811 | command to interact and view Job Queue information |
---|
812 | </p> |
---|
813 | <p> |
---|
814 | |
---|
815 | <span class="codefrag">Usage : hadoop queue [-list] | [-info <job-queue-name> [-showJobs]]</span> |
---|
816 | |
---|
817 | </p> |
---|
818 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
819 | |
---|
820 | <tr> |
---|
821 | |
---|
822 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
823 | |
---|
824 | </tr> |
---|
825 | |
---|
826 | <tr> |
---|
827 | |
---|
828 | <td colspan="1" rowspan="1"><span class="codefrag">-list</span> </td> |
---|
829 | <td colspan="1" rowspan="1">Gets list of Job Queues configured in the system. Along with scheduling information |
---|
830 | associated with the job queues. |
---|
831 | </td> |
---|
832 | |
---|
833 | </tr> |
---|
834 | |
---|
835 | <tr> |
---|
836 | |
---|
837 | <td colspan="1" rowspan="1"><span class="codefrag">-info <job-queue-name> [-showJobs]</span></td> |
---|
838 | <td colspan="1" rowspan="1"> |
---|
839 | Displays the job queue information and associated scheduling information of particular |
---|
840 | job queue. If -showJobs options is present a list of jobs submitted to the particular job |
---|
841 | queue is displayed. |
---|
842 | </td> |
---|
843 | |
---|
844 | </tr> |
---|
845 | |
---|
846 | </table> |
---|
847 | <a name="N10411"></a><a name="version"></a> |
---|
848 | <h3 class="h4"> version </h3> |
---|
849 | <p> |
---|
850 | Prints the version. |
---|
851 | </p> |
---|
852 | <p> |
---|
853 | |
---|
854 | <span class="codefrag">Usage: hadoop version</span> |
---|
855 | |
---|
856 | </p> |
---|
857 | <a name="N10421"></a><a name="CLASSNAME"></a> |
---|
858 | <h3 class="h4"> CLASSNAME </h3> |
---|
859 | <p> |
---|
860 | hadoop script can be used to invoke any class. |
---|
861 | </p> |
---|
862 | <p> |
---|
863 | |
---|
864 | <span class="codefrag">Usage: hadoop CLASSNAME</span> |
---|
865 | |
---|
866 | </p> |
---|
867 | <p> |
---|
868 | Runs the class named CLASSNAME. |
---|
869 | </p> |
---|
870 | </div> |
---|
871 | |
---|
872 | <a name="N10435"></a><a name="Administration+Commands"></a> |
---|
873 | <h2 class="h3"> Administration Commands </h2> |
---|
874 | <div class="section"> |
---|
875 | <p>Commands useful for administrators of a hadoop cluster.</p> |
---|
876 | <a name="N1043E"></a><a name="balancer"></a> |
---|
877 | <h3 class="h4"> balancer </h3> |
---|
878 | <p> |
---|
879 | Runs a cluster balancing utility. An administrator can simply press Ctrl-C to stop the |
---|
880 | rebalancing process. See <a href="hdfs_user_guide.html#Rebalancer">Rebalancer</a> for more details. |
---|
881 | </p> |
---|
882 | <p> |
---|
883 | |
---|
884 | <span class="codefrag">Usage: hadoop balancer [-threshold <threshold>]</span> |
---|
885 | |
---|
886 | </p> |
---|
887 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
888 | |
---|
889 | <tr> |
---|
890 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
891 | </tr> |
---|
892 | |
---|
893 | |
---|
894 | <tr> |
---|
895 | |
---|
896 | <td colspan="1" rowspan="1"><span class="codefrag">-threshold <threshold></span></td> |
---|
897 | <td colspan="1" rowspan="1">Percentage of disk capacity. This overwrites the default threshold.</td> |
---|
898 | |
---|
899 | </tr> |
---|
900 | |
---|
901 | </table> |
---|
902 | <a name="N1046D"></a><a name="daemonlog"></a> |
---|
903 | <h3 class="h4"> daemonlog </h3> |
---|
904 | <p> |
---|
905 | Get/Set the log level for each daemon. |
---|
906 | </p> |
---|
907 | <p> |
---|
908 | |
---|
909 | <span class="codefrag">Usage: hadoop daemonlog -getlevel <host:port> <name></span> |
---|
910 | <br> |
---|
911 | |
---|
912 | <span class="codefrag">Usage: hadoop daemonlog -setlevel <host:port> <name> <level></span> |
---|
913 | |
---|
914 | </p> |
---|
915 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
916 | |
---|
917 | <tr> |
---|
918 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
919 | </tr> |
---|
920 | |
---|
921 | |
---|
922 | <tr> |
---|
923 | |
---|
924 | <td colspan="1" rowspan="1"><span class="codefrag">-getlevel <host:port> <name></span></td> |
---|
925 | <td colspan="1" rowspan="1">Prints the log level of the daemon running at <host:port>. |
---|
926 | This command internally connects to http://<host:port>/logLevel?log=<name></td> |
---|
927 | |
---|
928 | </tr> |
---|
929 | |
---|
930 | <tr> |
---|
931 | |
---|
932 | <td colspan="1" rowspan="1"><span class="codefrag">-setlevel <host:port> <name> <level></span></td> |
---|
933 | <td colspan="1" rowspan="1">Sets the log level of the daemon running at <host:port>. |
---|
934 | This command internally connects to http://<host:port>/logLevel?log=<name></td> |
---|
935 | |
---|
936 | </tr> |
---|
937 | |
---|
938 | </table> |
---|
939 | <a name="N104AA"></a><a name="datanode"></a> |
---|
940 | <h3 class="h4"> datanode</h3> |
---|
941 | <p> |
---|
942 | Runs a HDFS datanode. |
---|
943 | </p> |
---|
944 | <p> |
---|
945 | |
---|
946 | <span class="codefrag">Usage: hadoop datanode [-rollback]</span> |
---|
947 | |
---|
948 | </p> |
---|
949 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
950 | |
---|
951 | <tr> |
---|
952 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
953 | </tr> |
---|
954 | |
---|
955 | |
---|
956 | <tr> |
---|
957 | |
---|
958 | <td colspan="1" rowspan="1"><span class="codefrag">-rollback</span></td> |
---|
959 | <td colspan="1" rowspan="1">Rollsback the datanode to the previous version. This should be used after stopping the datanode |
---|
960 | and distributing the old hadoop version.</td> |
---|
961 | |
---|
962 | </tr> |
---|
963 | |
---|
964 | </table> |
---|
965 | <a name="N104D5"></a><a name="dfsadmin"></a> |
---|
966 | <h3 class="h4"> dfsadmin </h3> |
---|
967 | <p> |
---|
968 | Runs a HDFS dfsadmin client. |
---|
969 | </p> |
---|
970 | <p> |
---|
971 | |
---|
972 | <span class="codefrag">Usage: hadoop dfsadmin [</span><a href="commands_manual.html#Generic+Options">GENERIC_OPTIONS</a><span class="codefrag">] [-report] [-safemode enter | leave | get | wait] [-refreshNodes] |
---|
973 | [-finalizeUpgrade] [-upgradeProgress status | details | force] [-metasave filename] |
---|
974 | [-setQuota <quota> <dirname>...<dirname>] [-clrQuota <dirname>...<dirname>] |
---|
975 | [-help [cmd]]</span> |
---|
976 | |
---|
977 | </p> |
---|
978 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
979 | |
---|
980 | <tr> |
---|
981 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
982 | </tr> |
---|
983 | |
---|
984 | |
---|
985 | <tr> |
---|
986 | |
---|
987 | <td colspan="1" rowspan="1"><span class="codefrag">-report</span></td> |
---|
988 | <td colspan="1" rowspan="1">Reports basic filesystem information and statistics.</td> |
---|
989 | |
---|
990 | </tr> |
---|
991 | |
---|
992 | <tr> |
---|
993 | |
---|
994 | <td colspan="1" rowspan="1"><span class="codefrag">-safemode enter | leave | get | wait</span></td> |
---|
995 | <td colspan="1" rowspan="1">Safe mode maintenance command. |
---|
996 | Safe mode is a Namenode state in which it <br> |
---|
997 | 1. does not accept changes to the name space (read-only) <br> |
---|
998 | 2. does not replicate or delete blocks. <br> |
---|
999 | Safe mode is entered automatically at Namenode startup, and |
---|
1000 | leaves safe mode automatically when the configured minimum |
---|
1001 | percentage of blocks satisfies the minimum replication |
---|
1002 | condition. Safe mode can also be entered manually, but then |
---|
1003 | it can only be turned off manually as well.</td> |
---|
1004 | |
---|
1005 | </tr> |
---|
1006 | |
---|
1007 | <tr> |
---|
1008 | |
---|
1009 | <td colspan="1" rowspan="1"><span class="codefrag">-refreshNodes</span></td> |
---|
1010 | <td colspan="1" rowspan="1">Re-read the hosts and exclude files to update the set |
---|
1011 | of Datanodes that are allowed to connect to the Namenode |
---|
1012 | and those that should be decommissioned or recommissioned.</td> |
---|
1013 | |
---|
1014 | </tr> |
---|
1015 | |
---|
1016 | <tr> |
---|
1017 | |
---|
1018 | <td colspan="1" rowspan="1"><span class="codefrag">-finalizeUpgrade</span></td> |
---|
1019 | <td colspan="1" rowspan="1">Finalize upgrade of HDFS. |
---|
1020 | Datanodes delete their previous version working directories, |
---|
1021 | followed by Namenode doing the same. |
---|
1022 | This completes the upgrade process.</td> |
---|
1023 | |
---|
1024 | </tr> |
---|
1025 | |
---|
1026 | <tr> |
---|
1027 | |
---|
1028 | <td colspan="1" rowspan="1"><span class="codefrag">-upgradeProgress status | details | force</span></td> |
---|
1029 | <td colspan="1" rowspan="1">Request current distributed upgrade status, |
---|
1030 | a detailed status or force the upgrade to proceed.</td> |
---|
1031 | |
---|
1032 | </tr> |
---|
1033 | |
---|
1034 | <tr> |
---|
1035 | |
---|
1036 | <td colspan="1" rowspan="1"><span class="codefrag">-metasave filename</span></td> |
---|
1037 | <td colspan="1" rowspan="1">Save Namenode's primary data structures |
---|
1038 | to <filename> in the directory specified by hadoop.log.dir property. |
---|
1039 | <filename> will contain one line for each of the following <br> |
---|
1040 | 1. Datanodes heart beating with Namenode<br> |
---|
1041 | 2. Blocks waiting to be replicated<br> |
---|
1042 | 3. Blocks currrently being replicated<br> |
---|
1043 | 4. Blocks waiting to be deleted</td> |
---|
1044 | |
---|
1045 | </tr> |
---|
1046 | |
---|
1047 | <tr> |
---|
1048 | |
---|
1049 | <td colspan="1" rowspan="1"><span class="codefrag">-setQuota <quota> <dirname>...<dirname></span></td> |
---|
1050 | <td colspan="1" rowspan="1">Set the quota <quota> for each directory <dirname>. |
---|
1051 | The directory quota is a long integer that puts a hard limit on the number of names in the directory tree.<br> |
---|
1052 | Best effort for the directory, with faults reported if<br> |
---|
1053 | 1. N is not a positive integer, or<br> |
---|
1054 | 2. user is not an administrator, or<br> |
---|
1055 | 3. the directory does not exist or is a file, or<br> |
---|
1056 | 4. the directory would immediately exceed the new quota.</td> |
---|
1057 | |
---|
1058 | </tr> |
---|
1059 | |
---|
1060 | <tr> |
---|
1061 | |
---|
1062 | <td colspan="1" rowspan="1"><span class="codefrag">-clrQuota <dirname>...<dirname></span></td> |
---|
1063 | <td colspan="1" rowspan="1">Clear the quota for each directory <dirname>.<br> |
---|
1064 | Best effort for the directory. with fault reported if<br> |
---|
1065 | 1. the directory does not exist or is a file, or<br> |
---|
1066 | 2. user is not an administrator.<br> |
---|
1067 | It does not fault if the directory has no quota.</td> |
---|
1068 | |
---|
1069 | </tr> |
---|
1070 | |
---|
1071 | <tr> |
---|
1072 | |
---|
1073 | <td colspan="1" rowspan="1"><span class="codefrag">-help [cmd]</span></td> |
---|
1074 | <td colspan="1" rowspan="1"> Displays help for the given command or all commands if none |
---|
1075 | is specified.</td> |
---|
1076 | |
---|
1077 | </tr> |
---|
1078 | |
---|
1079 | </table> |
---|
1080 | <a name="N10595"></a><a name="jobtracker"></a> |
---|
1081 | <h3 class="h4"> jobtracker </h3> |
---|
1082 | <p> |
---|
1083 | Runs the MapReduce job Tracker node. |
---|
1084 | </p> |
---|
1085 | <p> |
---|
1086 | |
---|
1087 | <span class="codefrag">Usage: hadoop jobtracker</span> |
---|
1088 | |
---|
1089 | </p> |
---|
1090 | <a name="N105A5"></a><a name="namenode"></a> |
---|
1091 | <h3 class="h4"> namenode </h3> |
---|
1092 | <p> |
---|
1093 | Runs the namenode. More info about the upgrade, rollback and finalize is at |
---|
1094 | <a href="hdfs_user_guide.html#Upgrade+and+Rollback">Upgrade Rollback</a> |
---|
1095 | |
---|
1096 | </p> |
---|
1097 | <p> |
---|
1098 | |
---|
1099 | <span class="codefrag">Usage: hadoop namenode [-format] | [-upgrade] | [-rollback] | [-finalize] | [-importCheckpoint]</span> |
---|
1100 | |
---|
1101 | </p> |
---|
1102 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
1103 | |
---|
1104 | <tr> |
---|
1105 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
1106 | </tr> |
---|
1107 | |
---|
1108 | |
---|
1109 | <tr> |
---|
1110 | |
---|
1111 | <td colspan="1" rowspan="1"><span class="codefrag">-format</span></td> |
---|
1112 | <td colspan="1" rowspan="1">Formats the namenode. It starts the namenode, formats it and then shut it down.</td> |
---|
1113 | |
---|
1114 | </tr> |
---|
1115 | |
---|
1116 | <tr> |
---|
1117 | |
---|
1118 | <td colspan="1" rowspan="1"><span class="codefrag">-upgrade</span></td> |
---|
1119 | <td colspan="1" rowspan="1">Namenode should be started with upgrade option after the distribution of new hadoop version.</td> |
---|
1120 | |
---|
1121 | </tr> |
---|
1122 | |
---|
1123 | <tr> |
---|
1124 | |
---|
1125 | <td colspan="1" rowspan="1"><span class="codefrag">-rollback</span></td> |
---|
1126 | <td colspan="1" rowspan="1">Rollsback the namenode to the previous version. This should be used after stopping the cluster |
---|
1127 | and distributing the old hadoop version.</td> |
---|
1128 | |
---|
1129 | </tr> |
---|
1130 | |
---|
1131 | <tr> |
---|
1132 | |
---|
1133 | <td colspan="1" rowspan="1"><span class="codefrag">-finalize</span></td> |
---|
1134 | <td colspan="1" rowspan="1">Finalize will remove the previous state of the files system. Recent upgrade will become permanent. |
---|
1135 | Rollback option will not be available anymore. After finalization it shuts the namenode down.</td> |
---|
1136 | |
---|
1137 | </tr> |
---|
1138 | |
---|
1139 | <tr> |
---|
1140 | |
---|
1141 | <td colspan="1" rowspan="1"><span class="codefrag">-importCheckpoint</span></td> |
---|
1142 | <td colspan="1" rowspan="1">Loads image from a checkpoint directory and save it into the current one. Checkpoint dir |
---|
1143 | is read from property fs.checkpoint.dir</td> |
---|
1144 | |
---|
1145 | </tr> |
---|
1146 | |
---|
1147 | </table> |
---|
1148 | <a name="N1060C"></a><a name="secondarynamenode"></a> |
---|
1149 | <h3 class="h4"> secondarynamenode </h3> |
---|
1150 | <p> |
---|
1151 | Runs the HDFS secondary namenode. See <a href="hdfs_user_guide.html#Secondary+Namenode">Secondary Namenode</a> |
---|
1152 | for more info. |
---|
1153 | </p> |
---|
1154 | <p> |
---|
1155 | |
---|
1156 | <span class="codefrag">Usage: hadoop secondarynamenode [-checkpoint [force]] | [-geteditsize]</span> |
---|
1157 | |
---|
1158 | </p> |
---|
1159 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
1160 | |
---|
1161 | <tr> |
---|
1162 | <th colspan="1" rowspan="1"> COMMAND_OPTION </th><th colspan="1" rowspan="1"> Description </th> |
---|
1163 | </tr> |
---|
1164 | |
---|
1165 | |
---|
1166 | <tr> |
---|
1167 | |
---|
1168 | <td colspan="1" rowspan="1"><span class="codefrag">-checkpoint [force]</span></td> |
---|
1169 | <td colspan="1" rowspan="1">Checkpoints the Secondary namenode if EditLog size >= fs.checkpoint.size. |
---|
1170 | If -force is used, checkpoint irrespective of EditLog size.</td> |
---|
1171 | |
---|
1172 | </tr> |
---|
1173 | |
---|
1174 | <tr> |
---|
1175 | |
---|
1176 | <td colspan="1" rowspan="1"><span class="codefrag">-geteditsize</span></td> |
---|
1177 | <td colspan="1" rowspan="1">Prints the EditLog size.</td> |
---|
1178 | |
---|
1179 | </tr> |
---|
1180 | |
---|
1181 | </table> |
---|
1182 | <a name="N10649"></a><a name="tasktracker"></a> |
---|
1183 | <h3 class="h4"> tasktracker </h3> |
---|
1184 | <p> |
---|
1185 | Runs a MapReduce task Tracker node. |
---|
1186 | </p> |
---|
1187 | <p> |
---|
1188 | |
---|
1189 | <span class="codefrag">Usage: hadoop tasktracker</span> |
---|
1190 | |
---|
1191 | </p> |
---|
1192 | </div> |
---|
1193 | |
---|
1194 | |
---|
1195 | |
---|
1196 | |
---|
1197 | |
---|
1198 | </div> |
---|
1199 | <!--+ |
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1200 | |end content |
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1201 | +--> |
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1202 | <div class="clearboth"> </div> |
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1203 | </div> |
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1204 | <div id="footer"> |
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1205 | <!--+ |
---|
1206 | |start bottomstrip |
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1207 | +--> |
---|
1208 | <div class="lastmodified"> |
---|
1209 | <script type="text/javascript"><!-- |
---|
1210 | document.write("Last Published: " + document.lastModified); |
---|
1211 | // --></script> |
---|
1212 | </div> |
---|
1213 | <div class="copyright"> |
---|
1214 | Copyright © |
---|
1215 | 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
---|
1216 | </div> |
---|
1217 | <!--+ |
---|
1218 | |end bottomstrip |
---|
1219 | +--> |
---|
1220 | </div> |
---|
1221 | </body> |
---|
1222 | </html> |
---|