For starters, you can specify them through the -libjars parameter when you kick off your M/R job. This way the jars will be copied to all TTs.
Regards, Shahab On Thu, May 30, 2013 at 2:43 PM, jamal sasha <[email protected]> wrote: > Hi Thanks guys. > I figured out the issue. Hence i have another question. > I am using a third party library and I thought that once I have created > the jar file I dont need to specify the dependancies but aparently thats > not the case. (error below) > Very very naive question...probably stupid. How do i specify third party > libraries (jar) in hadoop. > > Error: > Error: java.lang.ClassNotFoundException: org.json.JSONException > 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 java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:247) > at > org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:820) > at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:865) > at > org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370) > at org.apache.hadoop.mapred.Child$4.run(Child.java:255) > 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:1093) > at org.apache.hadoop.mapred.Child.main(Child.java:249) > > > > On Thu, May 30, 2013 at 2:02 AM, Pramod N <[email protected]> wrote: > >> Whatever you are trying to do should work, >> Here is the modified WordCount Map >> >> >> public void map(LongWritable key, Text value, Context context) throws >> IOException, InterruptedException { String line = value.toString(); >> >> JSONObject line_as_json = new JSONObject(line); >> String text = line_as_json.getString("text"); >> StringTokenizer tokenizer = new StringTokenizer(text); while >> (tokenizer.hasMoreTokens()) { word.set(tokenizer.nextToken()); >> context.write(word, one); } } >> >> >> >> >> >> Pramod N <http://atmachinelearner.blogspot.in> >> Bruce Wayne of web >> @machinelearner <https://twitter.com/machinelearner> >> >> -- >> >> >> On Thu, May 30, 2013 at 8:42 AM, Rahul Bhattacharjee < >> [email protected]> wrote: >> >>> Whatever you have mentioned Jamal should work.you can debug this. >>> >>> Thanks, >>> Rahul >>> >>> >>> On Thu, May 30, 2013 at 5:14 AM, jamal sasha <[email protected]>wrote: >>> >>>> Hi, >>>> For some reason, this have to be in java :( >>>> I am trying to use org.json library, something like (in mapper) >>>> JSONObject jsn = new JSONObject(value.toString()); >>>> >>>> String text = (String) jsn.get("text"); >>>> StringTokenizer itr = new StringTokenizer(text); >>>> >>>> But its not working :( >>>> It would be better to get this thing properly but I wouldnt mind using >>>> a hack as well :) >>>> >>>> >>>> On Wed, May 29, 2013 at 4:30 PM, Michael Segel < >>>> [email protected]> wrote: >>>> >>>>> Yeah, >>>>> I have to agree w Russell. Pig is definitely the way to go on this. >>>>> >>>>> If you want to do it as a Java program you will have to do some work >>>>> on the input string but it too should be trivial. >>>>> How formal do you want to go? >>>>> Do you want to strip it down or just find the quote after the text >>>>> part? >>>>> >>>>> >>>>> On May 29, 2013, at 5:13 PM, Russell Jurney <[email protected]> >>>>> wrote: >>>>> >>>>> Seriously consider Pig (free answer, 4 LOC): >>>>> >>>>> my_data = LOAD 'my_data.json' USING >>>>> com.twitter.elephantbird.pig.load.JsonLoader() AS json:map[]; >>>>> words = FOREACH my_data GENERATE $0#'author' as author, >>>>> FLATTEN(TOKENIZE($0#'text')) as word; >>>>> word_counts = FOREACH (GROUP words BY word) GENERATE group AS word, >>>>> COUNT_STAR(words) AS word_count; >>>>> STORE word_counts INTO '/tmp/word_counts.txt'; >>>>> >>>>> It will be faster than the Java you'll likely write. >>>>> >>>>> >>>>> On Wed, May 29, 2013 at 2:54 PM, jamal sasha <[email protected]>wrote: >>>>> >>>>>> Hi, >>>>>> I am stuck again. :( >>>>>> My input data is in hdfs. I am again trying to do wordcount but there >>>>>> is slight difference. >>>>>> The data is in json format. >>>>>> So each line of data is: >>>>>> >>>>>> {"author":"foo", "text": "hello"} >>>>>> {"author":"foo123", "text": "hello world"} >>>>>> {"author":"foo234", "text": "hello this world"} >>>>>> >>>>>> So I want to do wordcount for text part. >>>>>> I understand that in mapper, I just have to pass this data as json >>>>>> and extract "text" and rest of the code is just the same but I am trying >>>>>> to >>>>>> switch from python to java hadoop. >>>>>> How do I do this. >>>>>> Thanks >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Russell Jurney twitter.com/rjurney [email protected] >>>>> datasyndrome.com >>>>> >>>>> >>>>> >>>> >>> >> >
