1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
---|
2 | <html> |
---|
3 | <head> |
---|
4 | <META http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
---|
5 | <meta content="Apache Forrest" name="Generator"> |
---|
6 | <meta name="Forrest-version" content="0.8"> |
---|
7 | <meta name="Forrest-skin-name" content="pelt"> |
---|
8 | <title> |
---|
9 | HOD Configuration Guide |
---|
10 | </title> |
---|
11 | <link type="text/css" href="skin/basic.css" rel="stylesheet"> |
---|
12 | <link media="screen" type="text/css" href="skin/screen.css" rel="stylesheet"> |
---|
13 | <link media="print" type="text/css" href="skin/print.css" rel="stylesheet"> |
---|
14 | <link type="text/css" href="skin/profile.css" rel="stylesheet"> |
---|
15 | <script src="skin/getBlank.js" language="javascript" type="text/javascript"></script><script src="skin/getMenu.js" language="javascript" type="text/javascript"></script><script src="skin/fontsize.js" language="javascript" type="text/javascript"></script> |
---|
16 | <link rel="shortcut icon" href="images/favicon.ico"> |
---|
17 | </head> |
---|
18 | <body onload="init()"> |
---|
19 | <script type="text/javascript">ndeSetTextSize();</script> |
---|
20 | <div id="top"> |
---|
21 | <!--+ |
---|
22 | |breadtrail |
---|
23 | +--> |
---|
24 | <div class="breadtrail"> |
---|
25 | <a href="http://www.apache.org/">Apache</a> > <a href="http://hadoop.apache.org/">Hadoop</a> > <a href="http://hadoop.apache.org/core/">Core</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script> |
---|
26 | </div> |
---|
27 | <!--+ |
---|
28 | |header |
---|
29 | +--> |
---|
30 | <div class="header"> |
---|
31 | <!--+ |
---|
32 | |start group logo |
---|
33 | +--> |
---|
34 | <div class="grouplogo"> |
---|
35 | <a href="http://hadoop.apache.org/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Apache Hadoop"></a> |
---|
36 | </div> |
---|
37 | <!--+ |
---|
38 | |end group logo |
---|
39 | +--> |
---|
40 | <!--+ |
---|
41 | |start Project Logo |
---|
42 | +--> |
---|
43 | <div class="projectlogo"> |
---|
44 | <a href="http://hadoop.apache.org/core/"><img class="logoImage" alt="Hadoop" src="images/core-logo.gif" title="Scalable Computing Platform"></a> |
---|
45 | </div> |
---|
46 | <!--+ |
---|
47 | |end Project Logo |
---|
48 | +--> |
---|
49 | <!--+ |
---|
50 | |start Search |
---|
51 | +--> |
---|
52 | <div class="searchbox"> |
---|
53 | <form action="http://www.google.com/search" method="get" class="roundtopsmall"> |
---|
54 | <input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google"> |
---|
55 | <input name="Search" value="Search" type="submit"> |
---|
56 | </form> |
---|
57 | </div> |
---|
58 | <!--+ |
---|
59 | |end search |
---|
60 | +--> |
---|
61 | <!--+ |
---|
62 | |start Tabs |
---|
63 | +--> |
---|
64 | <ul id="tabs"> |
---|
65 | <li> |
---|
66 | <a class="unselected" href="http://hadoop.apache.org/core/">Project</a> |
---|
67 | </li> |
---|
68 | <li> |
---|
69 | <a class="unselected" href="http://wiki.apache.org/hadoop">Wiki</a> |
---|
70 | </li> |
---|
71 | <li class="current"> |
---|
72 | <a class="selected" href="index.html">Hadoop 0.20 Documentation</a> |
---|
73 | </li> |
---|
74 | </ul> |
---|
75 | <!--+ |
---|
76 | |end Tabs |
---|
77 | +--> |
---|
78 | </div> |
---|
79 | </div> |
---|
80 | <div id="main"> |
---|
81 | <div id="publishedStrip"> |
---|
82 | <!--+ |
---|
83 | |start Subtabs |
---|
84 | +--> |
---|
85 | <div id="level2tabs"></div> |
---|
86 | <!--+ |
---|
87 | |end Endtabs |
---|
88 | +--> |
---|
89 | <script type="text/javascript"><!-- |
---|
90 | document.write("Last Published: " + document.lastModified); |
---|
91 | // --></script> |
---|
92 | </div> |
---|
93 | <!--+ |
---|
94 | |breadtrail |
---|
95 | +--> |
---|
96 | <div class="breadtrail"> |
---|
97 | |
---|
98 | |
---|
99 | </div> |
---|
100 | <!--+ |
---|
101 | |start Menu, mainarea |
---|
102 | +--> |
---|
103 | <!--+ |
---|
104 | |start Menu |
---|
105 | +--> |
---|
106 | <div id="menu"> |
---|
107 | <div onclick="SwitchMenu('menu_1.1', 'skin/')" id="menu_1.1Title" class="menutitle">Getting Started</div> |
---|
108 | <div id="menu_1.1" class="menuitemgroup"> |
---|
109 | <div class="menuitem"> |
---|
110 | <a href="index.html">Overview</a> |
---|
111 | </div> |
---|
112 | <div class="menuitem"> |
---|
113 | <a href="quickstart.html">Quick Start</a> |
---|
114 | </div> |
---|
115 | <div class="menuitem"> |
---|
116 | <a href="cluster_setup.html">Cluster Setup</a> |
---|
117 | </div> |
---|
118 | <div class="menuitem"> |
---|
119 | <a href="mapred_tutorial.html">Map/Reduce Tutorial</a> |
---|
120 | </div> |
---|
121 | </div> |
---|
122 | <div onclick="SwitchMenu('menu_1.2', 'skin/')" id="menu_1.2Title" class="menutitle">Programming Guides</div> |
---|
123 | <div id="menu_1.2" class="menuitemgroup"> |
---|
124 | <div class="menuitem"> |
---|
125 | <a href="commands_manual.html">Commands</a> |
---|
126 | </div> |
---|
127 | <div class="menuitem"> |
---|
128 | <a href="distcp.html">DistCp</a> |
---|
129 | </div> |
---|
130 | <div class="menuitem"> |
---|
131 | <a href="native_libraries.html">Native Libraries</a> |
---|
132 | </div> |
---|
133 | <div class="menuitem"> |
---|
134 | <a href="streaming.html">Streaming</a> |
---|
135 | </div> |
---|
136 | <div class="menuitem"> |
---|
137 | <a href="fair_scheduler.html">Fair Scheduler</a> |
---|
138 | </div> |
---|
139 | <div class="menuitem"> |
---|
140 | <a href="capacity_scheduler.html">Capacity Scheduler</a> |
---|
141 | </div> |
---|
142 | <div class="menuitem"> |
---|
143 | <a href="service_level_auth.html">Service Level Authorization</a> |
---|
144 | </div> |
---|
145 | <div class="menuitem"> |
---|
146 | <a href="vaidya.html">Vaidya</a> |
---|
147 | </div> |
---|
148 | <div class="menuitem"> |
---|
149 | <a href="hadoop_archives.html">Archives</a> |
---|
150 | </div> |
---|
151 | </div> |
---|
152 | <div onclick="SwitchMenu('menu_1.3', 'skin/')" id="menu_1.3Title" class="menutitle">HDFS</div> |
---|
153 | <div id="menu_1.3" class="menuitemgroup"> |
---|
154 | <div class="menuitem"> |
---|
155 | <a href="hdfs_user_guide.html">User Guide</a> |
---|
156 | </div> |
---|
157 | <div class="menuitem"> |
---|
158 | <a href="hdfs_design.html">Architecture</a> |
---|
159 | </div> |
---|
160 | <div class="menuitem"> |
---|
161 | <a href="hdfs_shell.html">File System Shell Guide</a> |
---|
162 | </div> |
---|
163 | <div class="menuitem"> |
---|
164 | <a href="hdfs_permissions_guide.html">Permissions Guide</a> |
---|
165 | </div> |
---|
166 | <div class="menuitem"> |
---|
167 | <a href="hdfs_quota_admin_guide.html">Quotas Guide</a> |
---|
168 | </div> |
---|
169 | <div class="menuitem"> |
---|
170 | <a href="SLG_user_guide.html">Synthetic Load Generator Guide</a> |
---|
171 | </div> |
---|
172 | <div class="menuitem"> |
---|
173 | <a href="libhdfs.html">C API libhdfs</a> |
---|
174 | </div> |
---|
175 | </div> |
---|
176 | <div onclick="SwitchMenu('menu_selected_1.4', 'skin/')" id="menu_selected_1.4Title" class="menutitle" style="background-image: url('skin/images/chapter_open.gif');">HOD</div> |
---|
177 | <div id="menu_selected_1.4" class="selectedmenuitemgroup" style="display: block;"> |
---|
178 | <div class="menuitem"> |
---|
179 | <a href="hod_user_guide.html">User Guide</a> |
---|
180 | </div> |
---|
181 | <div class="menuitem"> |
---|
182 | <a href="hod_admin_guide.html">Admin Guide</a> |
---|
183 | </div> |
---|
184 | <div class="menupage"> |
---|
185 | <div class="menupagetitle">Config Guide</div> |
---|
186 | </div> |
---|
187 | </div> |
---|
188 | <div onclick="SwitchMenu('menu_1.5', 'skin/')" id="menu_1.5Title" class="menutitle">Miscellaneous</div> |
---|
189 | <div id="menu_1.5" class="menuitemgroup"> |
---|
190 | <div class="menuitem"> |
---|
191 | <a href="api/index.html">API Docs</a> |
---|
192 | </div> |
---|
193 | <div class="menuitem"> |
---|
194 | <a href="jdiff/changes.html">API Changes</a> |
---|
195 | </div> |
---|
196 | <div class="menuitem"> |
---|
197 | <a href="http://wiki.apache.org/hadoop/">Wiki</a> |
---|
198 | </div> |
---|
199 | <div class="menuitem"> |
---|
200 | <a href="http://wiki.apache.org/hadoop/FAQ">FAQ</a> |
---|
201 | </div> |
---|
202 | <div class="menuitem"> |
---|
203 | <a href="releasenotes.html">Release Notes</a> |
---|
204 | </div> |
---|
205 | <div class="menuitem"> |
---|
206 | <a href="changes.html">Change Log</a> |
---|
207 | </div> |
---|
208 | </div> |
---|
209 | <div id="credit"></div> |
---|
210 | <div id="roundbottom"> |
---|
211 | <img style="display: none" class="corner" height="15" width="15" alt="" src="skin/images/rc-b-l-15-1body-2menu-3menu.png"></div> |
---|
212 | <!--+ |
---|
213 | |alternative credits |
---|
214 | +--> |
---|
215 | <div id="credit2"></div> |
---|
216 | </div> |
---|
217 | <!--+ |
---|
218 | |end Menu |
---|
219 | +--> |
---|
220 | <!--+ |
---|
221 | |start content |
---|
222 | +--> |
---|
223 | <div id="content"> |
---|
224 | <div title="Portable Document Format" class="pdflink"> |
---|
225 | <a class="dida" href="hod_config_guide.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br> |
---|
226 | PDF</a> |
---|
227 | </div> |
---|
228 | <h1> |
---|
229 | HOD Configuration Guide |
---|
230 | </h1> |
---|
231 | <div id="minitoc-area"> |
---|
232 | <ul class="minitoc"> |
---|
233 | <li> |
---|
234 | <a href="#1.+Introduction">1. Introduction</a> |
---|
235 | </li> |
---|
236 | <li> |
---|
237 | <a href="#2.+Sections">2. Sections</a> |
---|
238 | </li> |
---|
239 | <li> |
---|
240 | <a href="#3.+HOD+Configuration+Options">3. HOD Configuration Options</a> |
---|
241 | <ul class="minitoc"> |
---|
242 | <li> |
---|
243 | <a href="#3.1+Common+configuration+options">3.1 Common configuration options</a> |
---|
244 | </li> |
---|
245 | <li> |
---|
246 | <a href="#3.2+hod+options">3.2 hod options</a> |
---|
247 | </li> |
---|
248 | <li> |
---|
249 | <a href="#3.3+resource_manager+options">3.3 resource_manager options</a> |
---|
250 | </li> |
---|
251 | <li> |
---|
252 | <a href="#3.4+ringmaster+options">3.4 ringmaster options</a> |
---|
253 | </li> |
---|
254 | <li> |
---|
255 | <a href="#3.5+gridservice-hdfs+options">3.5 gridservice-hdfs options</a> |
---|
256 | </li> |
---|
257 | <li> |
---|
258 | <a href="#3.6+gridservice-mapred+options">3.6 gridservice-mapred options</a> |
---|
259 | </li> |
---|
260 | <li> |
---|
261 | <a href="#3.7+hodring+options">3.7 hodring options</a> |
---|
262 | </li> |
---|
263 | </ul> |
---|
264 | </li> |
---|
265 | </ul> |
---|
266 | </div> |
---|
267 | |
---|
268 | <a name="N1000C"></a><a name="1.+Introduction"></a> |
---|
269 | <h2 class="h3">1. Introduction</h2> |
---|
270 | <div class="section"> |
---|
271 | <p>This guide discusses Hadoop on Demand (HOD) configuration sections and shows you how to work with the most important |
---|
272 | and commonly used HOD configuration options.</p> |
---|
273 | <p>Configuration options |
---|
274 | can be specified in two ways: a configuration file |
---|
275 | in the INI format, and as command line options to the HOD shell, |
---|
276 | specified in the format --section.option[=value]. If the same option is |
---|
277 | specified in both places, the value specified on the command line |
---|
278 | overrides the value in the configuration file.</p> |
---|
279 | <p> |
---|
280 | To get a simple description of all configuration options, type: |
---|
281 | </p> |
---|
282 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
---|
283 | <tr> |
---|
284 | <td colspan="1" rowspan="1"><span class="codefrag">$ hod --verbose-help</span></td> |
---|
285 | </tr> |
---|
286 | </table> |
---|
287 | </div> |
---|
288 | |
---|
289 | |
---|
290 | <a name="N10024"></a><a name="2.+Sections"></a> |
---|
291 | <h2 class="h3">2. Sections</h2> |
---|
292 | <div class="section"> |
---|
293 | <p>HOD organizes configuration options into these sections:</p> |
---|
294 | <ul> |
---|
295 | |
---|
296 | <li> hod: Options for the HOD client</li> |
---|
297 | |
---|
298 | <li> resource_manager: Options for specifying which resource manager |
---|
299 | to use, and other parameters for using that resource manager</li> |
---|
300 | |
---|
301 | <li> ringmaster: Options for the RingMaster process, </li> |
---|
302 | |
---|
303 | <li> hodring: Options for the HodRing processes</li> |
---|
304 | |
---|
305 | <li> gridservice-mapred: Options for the Map/Reduce daemons</li> |
---|
306 | |
---|
307 | <li> gridservice-hdfs: Options for the HDFS daemons.</li> |
---|
308 | |
---|
309 | </ul> |
---|
310 | </div> |
---|
311 | |
---|
312 | |
---|
313 | <a name="N10043"></a><a name="3.+HOD+Configuration+Options"></a> |
---|
314 | <h2 class="h3">3. HOD Configuration Options</h2> |
---|
315 | <div class="section"> |
---|
316 | <p>The following section describes configuration options common to most |
---|
317 | HOD sections followed by sections that describe configuration options |
---|
318 | specific to each HOD section.</p> |
---|
319 | <a name="N1004C"></a><a name="3.1+Common+configuration+options"></a> |
---|
320 | <h3 class="h4">3.1 Common configuration options</h3> |
---|
321 | <p>Certain configuration options are defined in most of the sections of |
---|
322 | the HOD configuration. Options defined in a section, are used by the |
---|
323 | process for which that section applies. These options have the same |
---|
324 | meaning, but can have different values in each section. |
---|
325 | </p> |
---|
326 | <ul> |
---|
327 | |
---|
328 | <li>temp-dir: Temporary directory for usage by the HOD processes. Make |
---|
329 | sure that the users who will run hod have rights to create |
---|
330 | directories under the directory specified here. If you |
---|
331 | wish to make this directory vary across allocations, |
---|
332 | you can make use of the environmental variables which will |
---|
333 | be made available by the resource manager to the HOD |
---|
334 | processes. For example, in a Torque setup, having |
---|
335 | --ringmaster.temp-dir=/tmp/hod-temp-dir.$PBS_JOBID would |
---|
336 | let ringmaster use different temp-dir for each |
---|
337 | allocation; Torque expands this variable before starting |
---|
338 | the ringmaster.</li> |
---|
339 | |
---|
340 | |
---|
341 | <li>debug: Numeric value from 1-4. 4 produces the most log information, |
---|
342 | and 1 the least.</li> |
---|
343 | |
---|
344 | |
---|
345 | <li>log-dir: Directory where log files are stored. By default, this is |
---|
346 | <install-location>/logs/. The restrictions and notes for the |
---|
347 | temp-dir variable apply here too. |
---|
348 | </li> |
---|
349 | |
---|
350 | |
---|
351 | <li>xrs-port-range: Range of ports, among which an available port shall |
---|
352 | be picked for use to run an XML-RPC server.</li> |
---|
353 | |
---|
354 | |
---|
355 | <li>http-port-range: Range of ports, among which an available port shall |
---|
356 | be picked for use to run an HTTP server.</li> |
---|
357 | |
---|
358 | |
---|
359 | <li>java-home: Location of Java to be used by Hadoop.</li> |
---|
360 | |
---|
361 | <li>syslog-address: Address to which a syslog daemon is bound to. The format |
---|
362 | of the value is host:port. If configured, HOD log messages |
---|
363 | will be logged to syslog using this value.</li> |
---|
364 | |
---|
365 | |
---|
366 | </ul> |
---|
367 | <a name="N1006E"></a><a name="3.2+hod+options"></a> |
---|
368 | <h3 class="h4">3.2 hod options</h3> |
---|
369 | <ul> |
---|
370 | |
---|
371 | <li>cluster: Descriptive name given to the cluster. For Torque, this is |
---|
372 | specified as a 'Node property' for every node in the cluster. |
---|
373 | HOD uses this value to compute the number of available nodes.</li> |
---|
374 | |
---|
375 | |
---|
376 | <li>client-params: Comma-separated list of hadoop config parameters |
---|
377 | specified as key-value pairs. These will be used to |
---|
378 | generate a hadoop-site.xml on the submit node that |
---|
379 | should be used for running Map/Reduce jobs.</li> |
---|
380 | |
---|
381 | <li>job-feasibility-attr: Regular expression string that specifies |
---|
382 | whether and how to check job feasibility - resource |
---|
383 | manager or scheduler limits. The current |
---|
384 | implementation corresponds to the torque job |
---|
385 | attribute 'comment' and by default is disabled. |
---|
386 | When set, HOD uses it to decide what type |
---|
387 | of limit violation is triggered and either |
---|
388 | deallocates the cluster or stays in queued state |
---|
389 | according as the request is beyond maximum limits or |
---|
390 | the cumulative usage has crossed maximum limits. |
---|
391 | The torque comment attribute may be updated |
---|
392 | periodically by an external mechanism. For example, |
---|
393 | comment attribute can be updated by running <a href="hod_admin_guide.html#checklimits.sh+-+Tool+to+update+torque+comment+field+reflecting+resource+limits"> |
---|
394 | checklimits.sh</a> script in hod/support directory, |
---|
395 | and then setting job-feasibility-attr equal to the |
---|
396 | value TORQUE_USER_LIMITS_COMMENT_FIELD, |
---|
397 | "User-limits exceeded. Requested:([0-9]*) |
---|
398 | Used:([0-9]*) MaxLimit:([0-9]*)", will make HOD |
---|
399 | behave accordingly. |
---|
400 | </li> |
---|
401 | |
---|
402 | </ul> |
---|
403 | <a name="N10085"></a><a name="3.3+resource_manager+options"></a> |
---|
404 | <h3 class="h4">3.3 resource_manager options</h3> |
---|
405 | <ul> |
---|
406 | |
---|
407 | <li>queue: Name of the queue configured in the resource manager to which |
---|
408 | jobs are to be submitted.</li> |
---|
409 | |
---|
410 | |
---|
411 | <li>batch-home: Install directory to which 'bin' is appended and under |
---|
412 | which the executables of the resource manager can be |
---|
413 | found.</li> |
---|
414 | |
---|
415 | |
---|
416 | <li>env-vars: Comma-separated list of key-value pairs, |
---|
417 | expressed as key=value, which would be passed to the jobs |
---|
418 | launched on the compute nodes. |
---|
419 | For example, if the python installation is |
---|
420 | in a non-standard location, one can set the environment |
---|
421 | variable 'HOD_PYTHON_HOME' to the path to the python |
---|
422 | executable. The HOD processes launched on the compute nodes |
---|
423 | can then use this variable.</li> |
---|
424 | |
---|
425 | <li>options: Comma-separated list of key-value pairs, |
---|
426 | expressed as |
---|
427 | <option>:<sub-option>=<value>. When |
---|
428 | passing to the job submission program, these are expanded |
---|
429 | as -<option> <sub-option>=<value>. These |
---|
430 | are generally used for specifying additional resource |
---|
431 | contraints for scheduling. For instance, with a Torque |
---|
432 | setup, one can specify |
---|
433 | --resource_manager.options='l:arch=x86_64' for |
---|
434 | constraining the nodes being allocated to a particular |
---|
435 | architecture; this option will be passed to Torque's qsub |
---|
436 | command as "-l arch=x86_64".</li> |
---|
437 | |
---|
438 | </ul> |
---|
439 | <a name="N1009B"></a><a name="3.4+ringmaster+options"></a> |
---|
440 | <h3 class="h4">3.4 ringmaster options</h3> |
---|
441 | <ul> |
---|
442 | |
---|
443 | <li>work-dirs: Comma-separated list of paths that will serve |
---|
444 | as the root for directories that HOD generates and passes |
---|
445 | to Hadoop for use to store DFS and Map/Reduce data. For |
---|
446 | example, |
---|
447 | this is where DFS data blocks will be stored. Typically, |
---|
448 | as many paths are specified as there are disks available |
---|
449 | to ensure all disks are being utilized. The restrictions |
---|
450 | and notes for the temp-dir variable apply here too.</li> |
---|
451 | |
---|
452 | <li>max-master-failures: Number of times a hadoop master |
---|
453 | daemon can fail to launch, beyond which HOD will fail |
---|
454 | the cluster allocation altogether. In HOD clusters, |
---|
455 | sometimes there might be a single or few "bad" nodes due |
---|
456 | to issues like missing java, missing or incorrect version |
---|
457 | of Hadoop etc. When this configuration variable is set |
---|
458 | to a positive integer, the RingMaster returns an error |
---|
459 | to the client only when the number of times a hadoop |
---|
460 | master (JobTracker or NameNode) fails to start on these |
---|
461 | bad nodes because of above issues, exceeds the specified |
---|
462 | value. If the number is not exceeded, the next HodRing |
---|
463 | which requests for a command to launch is given the same |
---|
464 | hadoop master again. This way, HOD tries its best for a |
---|
465 | successful allocation even in the presence of a few bad |
---|
466 | nodes in the cluster. |
---|
467 | </li> |
---|
468 | |
---|
469 | <li>workers_per_ring: Number of workers per service per HodRing. |
---|
470 | By default this is set to 1. If this configuration |
---|
471 | variable is set to a value 'n', the HodRing will run |
---|
472 | 'n' instances of the workers (TaskTrackers or DataNodes) |
---|
473 | on each node acting as a slave. This can be used to run |
---|
474 | multiple workers per HodRing, so that the total number of |
---|
475 | workers in a HOD cluster is not limited by the total |
---|
476 | number of nodes requested during allocation. However, note |
---|
477 | that this will mean each worker should be configured to use |
---|
478 | only a proportional fraction of the capacity of the |
---|
479 | resources on the node. In general, this feature is only |
---|
480 | useful for testing and simulation purposes, and not for |
---|
481 | production use.</li> |
---|
482 | |
---|
483 | </ul> |
---|
484 | <a name="N100AE"></a><a name="3.5+gridservice-hdfs+options"></a> |
---|
485 | <h3 class="h4">3.5 gridservice-hdfs options</h3> |
---|
486 | <ul> |
---|
487 | |
---|
488 | <li>external: If false, indicates that a HDFS cluster must be |
---|
489 | bought up by the HOD system, on the nodes which it |
---|
490 | allocates via the allocate command. Note that in that case, |
---|
491 | when the cluster is de-allocated, it will bring down the |
---|
492 | HDFS cluster, and all the data will be lost. |
---|
493 | If true, it will try and connect to an externally configured |
---|
494 | HDFS system. |
---|
495 | Typically, because input for jobs are placed into HDFS |
---|
496 | before jobs are run, and also the output from jobs in HDFS |
---|
497 | is required to be persistent, an internal HDFS cluster is |
---|
498 | of little value in a production system. However, it allows |
---|
499 | for quick testing.</li> |
---|
500 | |
---|
501 | |
---|
502 | <li>host: Hostname of the externally configured NameNode, if any</li> |
---|
503 | |
---|
504 | |
---|
505 | <li>fs_port: Port to which NameNode RPC server is bound.</li> |
---|
506 | |
---|
507 | |
---|
508 | <li>info_port: Port to which the NameNode web UI server is bound.</li> |
---|
509 | |
---|
510 | |
---|
511 | <li>pkgs: Installation directory, under which bin/hadoop executable is |
---|
512 | located. This can be used to use a pre-installed version of |
---|
513 | Hadoop on the cluster.</li> |
---|
514 | |
---|
515 | |
---|
516 | <li>server-params: Comma-separated list of hadoop config parameters |
---|
517 | specified key-value pairs. These will be used to |
---|
518 | generate a hadoop-site.xml that will be used by the |
---|
519 | NameNode and DataNodes.</li> |
---|
520 | |
---|
521 | |
---|
522 | <li>final-server-params: Same as above, except they will be marked final.</li> |
---|
523 | |
---|
524 | </ul> |
---|
525 | <a name="N100CD"></a><a name="3.6+gridservice-mapred+options"></a> |
---|
526 | <h3 class="h4">3.6 gridservice-mapred options</h3> |
---|
527 | <ul> |
---|
528 | |
---|
529 | <li>external: If false, indicates that a Map/Reduce cluster must be |
---|
530 | bought up by the HOD system on the nodes which it allocates |
---|
531 | via the allocate command. |
---|
532 | If true, if will try and connect to an externally |
---|
533 | configured Map/Reduce system.</li> |
---|
534 | |
---|
535 | |
---|
536 | <li>host: Hostname of the externally configured JobTracker, if any</li> |
---|
537 | |
---|
538 | |
---|
539 | <li>tracker_port: Port to which the JobTracker RPC server is bound</li> |
---|
540 | |
---|
541 | |
---|
542 | <li>info_port: Port to which the JobTracker web UI server is bound.</li> |
---|
543 | |
---|
544 | |
---|
545 | <li>pkgs: Installation directory, under which bin/hadoop executable is |
---|
546 | located</li> |
---|
547 | |
---|
548 | |
---|
549 | <li>server-params: Comma-separated list of hadoop config parameters |
---|
550 | specified key-value pairs. These will be used to |
---|
551 | generate a hadoop-site.xml that will be used by the |
---|
552 | JobTracker and TaskTrackers</li> |
---|
553 | |
---|
554 | |
---|
555 | <li>final-server-params: Same as above, except they will be marked final.</li> |
---|
556 | |
---|
557 | </ul> |
---|
558 | <a name="N100EC"></a><a name="3.7+hodring+options"></a> |
---|
559 | <h3 class="h4">3.7 hodring options</h3> |
---|
560 | <ul> |
---|
561 | |
---|
562 | <li>mapred-system-dir-root: Directory in the DFS under which HOD will |
---|
563 | generate sub-directory names and pass the full path |
---|
564 | as the value of the 'mapred.system.dir' configuration |
---|
565 | parameter to Hadoop daemons. The format of the full |
---|
566 | path will be value-of-this-option/userid/mapredsystem/cluster-id. |
---|
567 | Note that the directory specified here should be such |
---|
568 | that all users can create directories under this, if |
---|
569 | permissions are enabled in HDFS. Setting the value of |
---|
570 | this option to /user will make HOD use the user's |
---|
571 | home directory to generate the mapred.system.dir value.</li> |
---|
572 | |
---|
573 | |
---|
574 | <li>log-destination-uri: URL describing a path in an external, static DFS or the |
---|
575 | cluster node's local file system where HOD will upload |
---|
576 | Hadoop logs when a cluster is deallocated. To specify a |
---|
577 | DFS path, use the format 'hdfs://path'. To specify a |
---|
578 | cluster node's local file path, use the format 'file://path'. |
---|
579 | |
---|
580 | When clusters are deallocated by HOD, the hadoop logs will |
---|
581 | be deleted as part of HOD's cleanup process. To ensure these |
---|
582 | logs persist, you can use this configuration option. |
---|
583 | |
---|
584 | The format of the path is |
---|
585 | value-of-this-option/userid/hod-logs/cluster-id |
---|
586 | |
---|
587 | Note that the directory you specify here must be such that all |
---|
588 | users can create sub-directories under this. Setting this value |
---|
589 | to hdfs://user will make the logs come in the user's home directory |
---|
590 | in DFS.</li> |
---|
591 | |
---|
592 | |
---|
593 | <li>pkgs: Installation directory, under which bin/hadoop executable is located. This will |
---|
594 | be used by HOD to upload logs if a HDFS URL is specified in log-destination-uri |
---|
595 | option. Note that this is useful if the users are using a tarball whose version |
---|
596 | may differ from the external, static HDFS version.</li> |
---|
597 | |
---|
598 | |
---|
599 | </ul> |
---|
600 | </div> |
---|
601 | |
---|
602 | </div> |
---|
603 | <!--+ |
---|
604 | |end content |
---|
605 | +--> |
---|
606 | <div class="clearboth"> </div> |
---|
607 | </div> |
---|
608 | <div id="footer"> |
---|
609 | <!--+ |
---|
610 | |start bottomstrip |
---|
611 | +--> |
---|
612 | <div class="lastmodified"> |
---|
613 | <script type="text/javascript"><!-- |
---|
614 | document.write("Last Published: " + document.lastModified); |
---|
615 | // --></script> |
---|
616 | </div> |
---|
617 | <div class="copyright"> |
---|
618 | Copyright © |
---|
619 | 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
---|
620 | </div> |
---|
621 | <!--+ |
---|
622 | |end bottomstrip |
---|
623 | +--> |
---|
624 | </div> |
---|
625 | </body> |
---|
626 | </html> |
---|