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| 225 | </div> |
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| 226 | <h1>Native Libraries 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="#Purpose">Purpose</a> |
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| 231 | </li> |
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| 232 | <li> |
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| 233 | <a href="#Components">Components</a> |
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| 234 | </li> |
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| 235 | <li> |
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| 236 | <a href="#Usage">Usage</a> |
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| 237 | </li> |
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| 238 | <li> |
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| 239 | <a href="#Supported+Platforms">Supported Platforms</a> |
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| 240 | </li> |
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| 241 | <li> |
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| 242 | <a href="#Building+Native+Hadoop+Libraries">Building Native Hadoop Libraries</a> |
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| 243 | <ul class="minitoc"> |
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| 244 | <li> |
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| 245 | <a href="#Notes">Notes</a> |
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| 246 | </li> |
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| 247 | </ul> |
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| 248 | </li> |
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| 249 | <li> |
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| 250 | <a href="#Loading+native+libraries+through+DistributedCache"> Loading native libraries through DistributedCache </a> |
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| 251 | </li> |
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| 252 | </ul> |
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| 253 | </div> |
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| 254 | |
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| 255 | |
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| 256 | <a name="N1000D"></a><a name="Purpose"></a> |
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| 257 | <h2 class="h3">Purpose</h2> |
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| 258 | <div class="section"> |
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| 259 | <p>Hadoop has native implementations of certain components for reasons of |
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| 260 | both performance and non-availability of Java implementations. These |
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| 261 | components are available in a single, dynamically-linked, native library. |
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| 262 | On the *nix platform it is <em>libhadoop.so</em>. This document describes |
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| 263 | the usage and details on how to build the native libraries.</p> |
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| 264 | </div> |
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| 265 | |
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| 266 | |
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| 267 | <a name="N1001A"></a><a name="Components"></a> |
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| 268 | <h2 class="h3">Components</h2> |
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| 269 | <div class="section"> |
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| 270 | <p>Hadoop currently has the following |
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| 271 | <a href="api/org/apache/hadoop/io/compress/CompressionCodec.html"> |
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| 272 | compression codecs</a> as the native components:</p> |
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| 273 | <ul> |
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| 274 | |
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| 275 | <li> |
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| 276 | <a href="http://www.zlib.net/">zlib</a> |
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| 277 | </li> |
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| 278 | |
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| 279 | <li> |
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| 280 | <a href="http://www.gzip.org/">gzip</a> |
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| 281 | </li> |
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| 282 | |
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| 283 | <li> |
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| 284 | <a href="http://www.bzip.org/">bzip2</a> |
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| 285 | </li> |
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| 286 | |
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| 287 | </ul> |
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| 288 | <p>Of the above, the availability of native hadoop libraries is imperative |
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| 289 | for the gzip and bzip2 compression codecs to work.</p> |
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| 290 | </div> |
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| 291 | |
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| 292 | |
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| 293 | <a name="N1003D"></a><a name="Usage"></a> |
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| 294 | <h2 class="h3">Usage</h2> |
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| 295 | <div class="section"> |
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| 296 | <p>It is fairly simple to use the native hadoop libraries:</p> |
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| 297 | <ul> |
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| 298 | |
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| 299 | <li> |
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| 300 | Take a look at the |
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| 301 | <a href="#Supported+Platforms">supported platforms</a>. |
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| 302 | </li> |
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| 303 | |
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| 304 | <li> |
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| 305 | Either <a href="http://hadoop.apache.org/core/releases.html#Download">download</a> the pre-built |
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| 306 | 32-bit i386-Linux native hadoop libraries (available as part of hadoop |
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| 307 | distribution in <span class="codefrag">lib/native</span> directory) or |
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| 308 | <a href="#Building+Native+Hadoop+Libraries">build</a> them yourself. |
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| 309 | </li> |
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| 310 | |
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| 311 | <li> |
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| 312 | Make sure you have any of or all of <strong>>zlib-1.2</strong>, |
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| 313 | <strong>>gzip-1.2</strong>, and <strong>>bzip2-1.0</strong> |
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| 314 | packages for your platform installed; |
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| 315 | depending on your needs. |
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| 316 | </li> |
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| 317 | |
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| 318 | </ul> |
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| 319 | <p>The <span class="codefrag">bin/hadoop</span> script ensures that the native hadoop |
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| 320 | library is on the library path via the system property |
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| 321 | <em>-Djava.library.path=<path></em>.</p> |
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| 322 | <p>To check everything went alright check the hadoop log files for:</p> |
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| 323 | <p> |
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| 324 | |
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| 325 | <span class="codefrag"> |
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| 326 | DEBUG util.NativeCodeLoader - Trying to load the custom-built |
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| 327 | native-hadoop library... |
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| 328 | </span> |
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| 329 | <br> |
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| 330 | |
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| 331 | <span class="codefrag"> |
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| 332 | INFO util.NativeCodeLoader - Loaded the native-hadoop library |
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| 333 | </span> |
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| 334 | |
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| 335 | </p> |
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| 336 | <p>If something goes wrong, then:</p> |
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| 337 | <p> |
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| 338 | |
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| 339 | <span class="codefrag"> |
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| 340 | INFO util.NativeCodeLoader - Unable to load native-hadoop library for |
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| 341 | your platform... using builtin-java classes where applicable |
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| 342 | </span> |
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| 343 | |
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| 344 | </p> |
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| 345 | </div> |
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| 346 | |
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| 347 | |
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| 348 | <a name="N1008A"></a><a name="Supported+Platforms"></a> |
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| 349 | <h2 class="h3">Supported Platforms</h2> |
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| 350 | <div class="section"> |
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| 351 | <p>Hadoop native library is supported only on *nix platforms only. |
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| 352 | Unfortunately it is known not to work on <a href="http://www.cygwin.com/">Cygwin</a> |
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| 353 | and <a href="http://www.apple.com/macosx">Mac OS X</a> and has mainly been used on the |
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| 354 | GNU/Linux platform.</p> |
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| 355 | <p>It has been tested on the following GNU/Linux distributions:</p> |
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| 356 | <ul> |
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| 357 | |
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| 358 | <li> |
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| 359 | |
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| 360 | <a href="http://www.redhat.com/rhel/">RHEL4</a>/<a href="http://fedora.redhat.com/">Fedora</a> |
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| 361 | |
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| 362 | </li> |
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| 363 | |
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| 364 | <li> |
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| 365 | <a href="http://www.ubuntu.com/">Ubuntu</a> |
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| 366 | </li> |
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| 367 | |
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| 368 | <li> |
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| 369 | <a href="http://www.gentoo.org/">Gentoo</a> |
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| 370 | </li> |
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| 371 | |
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| 372 | </ul> |
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| 373 | <p>On all the above platforms a 32/64 bit Hadoop native library will work |
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| 374 | with a respective 32/64 bit jvm.</p> |
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| 375 | </div> |
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| 376 | |
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| 377 | |
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| 378 | <a name="N100BA"></a><a name="Building+Native+Hadoop+Libraries"></a> |
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| 379 | <h2 class="h3">Building Native Hadoop Libraries</h2> |
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| 380 | <div class="section"> |
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| 381 | <p>Hadoop native library is written in |
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| 382 | <a href="http://en.wikipedia.org/wiki/ANSI_C">ANSI C</a> and built using |
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| 383 | the GNU autotools-chain (autoconf, autoheader, automake, autoscan, libtool). |
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| 384 | This means it should be straight-forward to build them on any platform with |
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| 385 | a standards compliant C compiler and the GNU autotools-chain. |
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| 386 | See <a href="#Supported+Platforms">supported platforms</a>.</p> |
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| 387 | <p>In particular the various packages you would need on the target |
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| 388 | platform are:</p> |
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| 389 | <ul> |
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| 390 | |
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| 391 | <li> |
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| 392 | C compiler (e.g. <a href="http://gcc.gnu.org/">GNU C Compiler</a>) |
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| 393 | </li> |
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| 394 | |
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| 395 | <li> |
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| 396 | GNU Autools Chain: |
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| 397 | <a href="http://www.gnu.org/software/autoconf/">autoconf</a>, |
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| 398 | <a href="http://www.gnu.org/software/automake/">automake</a>, |
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| 399 | <a href="http://www.gnu.org/software/libtool/">libtool</a> |
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| 400 | |
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| 401 | </li> |
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| 402 | |
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| 403 | <li> |
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| 404 | zlib-development package (stable version >= 1.2.0) |
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| 405 | </li> |
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| 406 | |
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| 407 | </ul> |
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| 408 | <p>Once you have the pre-requisites use the standard <span class="codefrag">build.xml</span> |
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| 409 | and pass along the <span class="codefrag">compile.native</span> flag (set to |
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| 410 | <span class="codefrag">true</span>) to build the native hadoop library:</p> |
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| 411 | <p> |
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| 412 | <span class="codefrag">$ ant -Dcompile.native=true <target></span> |
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| 413 | </p> |
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| 414 | <p>The native hadoop library is not built by default since not everyone is |
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| 415 | interested in building them.</p> |
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| 416 | <p>You should see the newly-built native hadoop library in:</p> |
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| 417 | <p> |
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| 418 | <span class="codefrag">$ build/native/<platform>/lib</span> |
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| 419 | </p> |
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| 420 | <p>where <platform> is combination of the system-properties: |
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| 421 | <span class="codefrag">${os.name}-${os.arch}-${sun.arch.data.model}</span>; for e.g. |
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| 422 | Linux-i386-32.</p> |
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| 423 | <a name="N1010A"></a><a name="Notes"></a> |
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| 424 | <h3 class="h4">Notes</h3> |
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| 425 | <ul> |
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| 426 | |
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| 427 | <li> |
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| 428 | It is <strong>mandatory</strong> to have the |
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| 429 | zlib, gzip, and bzip2 |
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| 430 | development packages on the target platform for building the |
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| 431 | native hadoop library; however for deployment it is sufficient to |
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| 432 | install one of them if you wish to use only one of them. |
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| 433 | </li> |
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| 434 | |
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| 435 | <li> |
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| 436 | It is necessary to have the correct 32/64 libraries of both zlib |
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| 437 | depending on the 32/64 bit jvm for the target platform for |
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| 438 | building/deployment of the native hadoop library. |
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| 439 | </li> |
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| 440 | |
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| 441 | </ul> |
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| 442 | </div> |
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| 443 | |
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| 444 | <a name="N1011E"></a><a name="Loading+native+libraries+through+DistributedCache"></a> |
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| 445 | <h2 class="h3"> Loading native libraries through DistributedCache </h2> |
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| 446 | <div class="section"> |
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| 447 | <p>User can load native shared libraries through |
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| 448 | <a href="mapred_tutorial.html#DistributedCache">DistributedCache</a> |
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| 449 | for <em>distributing</em> and <em>symlinking</em> the library files</p> |
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| 450 | <p>Here is an example, describing how to distribute the library and |
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| 451 | load it from map/reduce task. </p> |
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| 452 | <ol> |
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| 453 | |
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| 454 | <li> First copy the library to the HDFS. <br> |
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| 455 | |
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| 456 | <span class="codefrag">bin/hadoop fs -copyFromLocal mylib.so.1 /libraries/mylib.so.1</span> |
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| 457 | |
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| 458 | </li> |
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| 459 | |
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| 460 | <li> The job launching program should contain the following: <br> |
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| 461 | |
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| 462 | <span class="codefrag"> DistributedCache.createSymlink(conf); </span> |
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| 463 | <br> |
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| 464 | |
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| 465 | <span class="codefrag"> DistributedCache.addCacheFile("hdfs://host:port/libraries/mylib.so.1#mylib.so", conf); |
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| 466 | </span> |
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| 467 | |
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| 468 | </li> |
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| 469 | |
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| 470 | <li> The map/reduce task can contain: <br> |
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| 471 | |
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| 472 | <span class="codefrag"> System.loadLibrary("mylib.so"); </span> |
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| 473 | |
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| 474 | </li> |
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| 475 | |
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| 476 | </ol> |
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| 477 | </div> |
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| 478 | |
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| 479 | </div> |
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| 480 | <!--+ |
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| 491 | document.write("Last Published: " + document.lastModified); |
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| 492 | // --></script> |
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| 493 | </div> |
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| 494 | <div class="copyright"> |
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| 495 | Copyright © |
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| 496 | 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
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| 497 | </div> |
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