Hi Baraa, I'm assuming you're using trunk for your experiment. Nevertheless, this error basically tells you that Pig cannot instanticate your UDF. Common cause is misspelling. Is mypigudf.DicomParser fully qualified class name of your UDF? I noticed that mypigudf is the jar file name as well.
Thanks, Xuefu -----Original Message----- From: Baraa Mohamad [mailto:[email protected]] Sent: Tuesday, March 22, 2011 11:41 AM To: [email protected] Subject: Failed to generate logical plan Hi all, I wrote a simple udf DicomParser which read a line and convert it to tuple but when I tried to use like that register H:/apps/mypig/mypigudf.jar; A = load 'dicoms/' using org.apache.pig.piggybank.storage.XMLLoader('attr') as (x:chararray); B = Foreach A generate mypigudf.DicomParser(x); store B into 'testUdf'; I get this error Pig Stack Trace --------------- ERROR 1000: Error during parsing. Failed to generate logical plan. Nested exception: java.lang.RuntimeException: Cannot instantiate: mypigudf.DicomParser org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during parsing. Failed to generate logical plan. Nested exception: java.lang.RuntimeException: Cannot instantiate: mypigudf.DicomParser at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1568) at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1513) at org.apache.pig.PigServer.registerQuery(PigServer.java:581) at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:917) at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:176) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:152) at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90) at org.apache.pig.Main.run(Main.java:537) at org.apache.pig.Main.main(Main.java:108) ================================================================================ why i can't use it i didn't find how I can solve this error Regards Baraa
