java - Pig ERROR 1066: Unable to open iterator for alias returned from UDF -


i trying load own udf in pig. have made jar using eclipse's export function. getting 1066 error when running pig script. not sure b = .. can dump a, can not dump b.

script

register myudfs.jar;  define hour myudfs.hour;  = load 'access_log_jul95' using pigstorage(' ') (ip:chararray, dash1:chararray, dash2:chararray, date:chararray, getrequset:chararray, status:int, port:int); b = foreach generate hour(ip); dump b;

function

package myudfs; import java.io.ioexception; import org.apache.pig.evalfunc; import org.apache.pig.data.tuple; import org.apache.pig.impl.util.wrappedioexception;  public class hour extends evalfunc<string> {     @suppresswarnings("deprecation")     public string exec(tuple input) throws ioexception {         if (input == null || input.size() == 0)             return null;         try{             string str = (string)input.get(0);                             return str.touppercase();         }catch(exception e){             throw wrappedioexception.wrap("caught exception processing input row ", e);         }     } }

running command

pig -x mapreduce 2.pig

data format

199.72.81.55 - - [01/jul/1995:00:00:01 -0400] "get /history/apollo/ http/1.0" 200 6245    |                     |                                  |                  |    |    ip                   date                               getrequest       status port

pig stack trace

error 1066: unable open iterator alias b  org.apache.pig.impl.logicallayer.frontendexception: error 1066: unable open iterator alias b @ org.apache.pig.pigserver.openiterator(pigserver.java:836) @ org.apache.pig.tools.grunt.gruntparser.processdump(gruntparser.java:696) @   org.apache.pig.tools.pigscript.parser.pigscriptparser.parse(pigscriptparser.java:320) @ org.apache.pig.tools.grunt.gruntparser.parsestoponerror(gruntparser.java:194) @ org.apache.pig.tools.grunt.gruntparser.parsestoponerror(gruntparser.java:170) @ org.apache.pig.tools.grunt.grunt.exec(grunt.java:84) @ org.apache.pig.main.run(main.java:604) @ org.apache.pig.main.main(main.java:157) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57) @     sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:601) @ org.apache.hadoop.util.runjar.main(runjar.java:208) caused by: java.io.ioexception: job terminated anomalous status failed @ org.apache.pig.pigserver.openiterator(pigserver.java:828) ... 12 more

i extremely unfamiliar pig, , , pointers appreciated. know lot of information at, have had no luck in mutating data in udf, , not sure went wrong.

thanks


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