Apache Pig: unable to run my own pig.jar and pig-withouthadoop.jar

I have a cluster running Hadoop 0.20.2 and Pig 0.10. I'm interested to add some logs to Pig's source code and to run my own Pig version on the cluster. What I did: built the project with 'ant' command got pig.jar and pig-withouthadoop.jar copied the jars to Pig home directory on the cluster's namenode run a job Then I've got following std output: ``` 2013-03-25 06:35:05,226 [main] WARN org.apache.pig.backend.hadoop20.PigJobControl - falling back to default JobControl (not using hadoop 0.20 ?) java.lang.NoSuchFieldException: runnerState at java.lang.Class.getDeclaredField(Class.java:1882) at org.apache.pig.backend.hadoop20.PigJobControl.<clinit>(PigJobControl.java:51) at org.apache.pig.backend.hadoop.executionengine.shims.HadoopShims.newJobControl(HadoopShims.java:97) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:287) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:177) at org.apache.pig.PigServer.launchPlan(PigServer.java:1320) at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1305) at org.apache.pig.PigServer.execute(PigServer.java:1295) at org.apache.pig.PigServer.executeBatch(PigServer.java:375) at org.apache.pig.PigServer.executeBatch(PigServer.java:353) at org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:137) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:170) at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84) at org.apache.pig.Main.run(Main.java:480) at org.apache.pig.Main.main(Main.java:157) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:208) 2013-03-25 06:35:05,229 [main] INFO org.apache.pig.tools.pigstats.ScriptState - Pig script settings are added to the job 2013-03-25 06:35:05,260 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - mapred.job.reduce.markreset.buffer.percent is not set, set to default 0.3 2013-03-25 06:35:05,272 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - Setting Parallelism to 1 2013-03-25 06:35:06,041 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - creating jar file Job9091543475518322185.jar 2013-03-25 06:35:10,974 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - jar file Job9091543475518322185.jar created 2013-03-25 06:35:10,995 [main] INFO org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - Setting up single store job 2013-03-25 06:35:11,006 [main] INFO org.apache.pig.data.SchemaTupleFrontend - Key [pig.schematuple] is false, will not generate code. 2013-03-25 06:35:11,006 [main] INFO org.apache.pig.data.SchemaTupleFrontend - Starting process to move generated code to distributed cacche 2013-03-25 06:35:11,006 [main] INFO org.apache.pig.data.SchemaTupleFrontend - Setting key [pig.schematuple.classes] with classes to deserialize [] 2013-03-25 06:35:11,181 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2998: Unhandled internal error. org.apache.hadoop.mapred.jobcontrol.JobControl.addJob(Lorg/apache/hadoop/mapred/jobcontrol/Job;)Ljava/lang/String; ``` Pig Stack Trace: ``` ERROR 2998: Unhandled internal error. org.apache.hadoop.mapred.jobcontrol.JobControl.addJob(Lorg/apache/hadoop/mapred/jobcontrol/Job;)Ljava/lang/String; java.lang.NoSuchMethodError: org.apache.hadoop.mapred.jobcontrol.JobControl.addJob(Lorg/apache/hadoop/mapred/jobcontrol/Job;)Ljava/lang/String; at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:298) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:177) at org.apache.pig.PigServer.launchPlan(PigServer.java:1320) at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1305) at org.apache.pig.PigServer.execute(PigServer.java:1295) at org.apache.pig.PigServer.executeBatch(PigServer.java:375) at org.apache.pig.PigServer.executeBatch(PigServer.java:353) at org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:137) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:170) at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84) at org.apache.pig.Main.run(Main.java:480) at org.apache.pig.Main.main(Main.java:157) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:208) ``` what went wrong? Should I do anything else except replacing pig.jar and pig-withouthadoop.jar in installation directory of namenode? help...