Just a note for "-libjars". All the hadoop Tools options "-libjars", "-files"... have to be in front of the customized options. Any options after the one that Tools does not understand will be considered as customized options and ignored.
Zhu, Guojun Modeling Sr Graduate 571-3824370 guojun_...@freddiemac.com Financial Engineering Freddie Mac Devaraj k <devara...@huawei.com> 04/04/2012 04:38 AM Please respond to mapreduce-user@hadoop.apache.org To "mapreduce-user@hadoop.apache.org" <mapreduce-user@hadoop.apache.org> cc Subject RE: Including third party jar files in Map Reduce job As Bejoy mentioned, If you have copied the jar to $HADOOP_HOME, then you should copy it to all the nodes in the cluster. (or) If you want to make use of -libjar option, your application should implement Tool to support generic options. Please check the below link for more details. http://hadoop.apache.org/common/docs/current/commands_manual.html#jar Thanks Devaraj ________________________________________ From: Bejoy Ks [bejoy.had...@gmail.com] Sent: Wednesday, April 04, 2012 1:06 PM To: mapreduce-user@hadoop.apache.org Subject: Re: Including third party jar files in Map Reduce job Hi Utkarsh You can add third party jars to your map reduce job elegantly in the following ways 1) use - libjars hadoop jar jarName.jar com.driver.ClassName -libjars /home/some/dir/somejar.jar .... 2) include the third pary jars in /lib folder while packaging your application 3) If you are adding the jar in HADOOP_HOME/lib , you need to add this at all nodes. Regards Bejoy KS On Wed, Apr 4, 2012 at 12:55 PM, Utkarsh Gupta <utkarsh_gu...@infosys.com< mailto:utkarsh_gu...@infosys.com>> wrote: Hi Devaraj, I have already copied the required jar file in $HADOOP_HOME/lib folder. Can you tell me where to add generic option -libjars The stack trace is: hadoop$ bin/hadoop jar WordCount.jar /user/hduser1/input/ /user/hduser1/output 12/04/04 12:45:51 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same. 12/04/04 12:45:51 INFO input.FileInputFormat: Total input paths to process : 1 12/04/04 12:45:51 INFO mapred.JobClient: Running job: job_201204041107_0005 12/04/04 12:45:52 INFO mapred.JobClient: map 0% reduce 0% 12/04/04 12:46:07 INFO mapred.JobClient: Task Id : attempt_201204041107_0005_m_000000_0, Status : FAILED Error: java.lang.ClassNotFoundException: org.apache.commons.math3.random.RandomDataImpl at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at wordcount.MyMapper.map(MyMapper.java:22) at wordcount.MyMapper.map(MyMapper.java:14) at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:369) at org.apache.hadoop.mapred.Child$4.run(Child.java:259) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059) at org.apache.hadoop.mapred.Child.main(Child.java:253) Thanks and Regards Utkarsh -----Original Message----- From: Devaraj k [mailto:devara...@huawei.com<mailto:devara...@huawei.com>] Sent: Wednesday, April 04, 2012 12:35 PM To: mapreduce-user@hadoop.apache.org< mailto:mapreduce-user@hadoop.apache.org> Subject: RE: Including third party jar files in Map Reduce job Hi Utkarsh, The usage of the jar command is like this, Usage: hadoop jar <jar> [mainClass] args... If you want the commons-math3.jar to be available for all the tasks you can do any one of these 1. Copy the jar file in $HADOOP_HOME/lib dir or 2. Use the generic option -libjars. Can you give the stack trace of your problem for which class it is giving ClassNotFoundException(i.e for main class or math lib class)? Thanks Devaraj ________________________________________ From: Utkarsh Gupta [utkarsh_gu...@infosys.com< mailto:utkarsh_gu...@infosys.com>] Sent: Wednesday, April 04, 2012 12:22 PM To: mapreduce-user@hadoop.apache.org< mailto:mapreduce-user@hadoop.apache.org> Subject: Including third party jar files in Map Reduce job Hi All, I am new to Hadoop and was trying to generate random numbers using apache commons math library. I used Netbeans to build the jar file and the manifest has path to commons-math jar as lib/commons-math3.jar I have placed this jar file in HADOOP_HOME/lib folder but still I am getting ClassNotFoundException. I tried using -libjars option with $HADOOP_HOME/bin/Hadoop jar myprg.jar <inputpath> <outputpath> -libjars <jarpath> And $HADOOP_HOME/bin/Hadoop jar myprg.jar -libjar <jarpath> <inputpath> <outputpath> But this is not working. Please help. Thanks and Regards Utkarsh Gupta **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. 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