I have been facing this issue from long time. I tried to solve this but i couldn't. I need some experts advice to solve this. I am trying to load a sample tweets obtained with flume.   This is the error:     Pig Stack Trace --------------- ERROR 1066: Unable to open iterator for alias tweets. Backend error : java.lang.IllegalStateException: Job in state DEFINE instead of RUNNING org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias tweets. Backend error : java.lang.IllegalStateException: Job in state DEFINE instead of RUNNING at org.apache.pig.PigServer.openIterator(PigServer.java:1010) at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:782) at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:383) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:230) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:205) at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:66) at org.apache.pig.Main.run(Main.java:564) at org.apache.pig.Main.main(Main.java:175) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.RunJar.run(RunJar.java:323) at org.apache.hadoop.util.RunJar.main(RunJar.java:236) Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0: java.lang.IllegalStateException: Job in state DEFINE instead of RUNNING at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.getStats(MapReduceLauncher.java:844) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:473) at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:290) at org.apache.pig.PigServer.launchPlan(PigServer.java:1475) at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1460) at org.apache.pig.PigServer.storeEx(PigServer.java:1119) at org.apache.pig.PigServer.store(PigServer.java:1082) at org.apache.pig.PigServer.openIterator(PigServer.java:995) ... 13 more Caused by: java.lang.IllegalStateException: Job in state DEFINE instead of RUNNING at org.apache.hadoop.mapreduce.Job.ensureState(Job.java:302) at org.apache.hadoop.mapreduce.Job.getTaskReports(Job.java:544) at org.apache.pig.tools.pigstats.mapreduce.MRJobStats.getTaskReports(MRJobStats.java:532) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.getStats(MapReduceLauncher.java:823) ... 20 more       I have tried to load this json file using ELEPHANT BIRD script:     REGISTER '/home/hdoop/Escritorio/json-simple-1.1.1.jar' REGISTER '/home/hdoop/Escritorio/elephant-bird-pig-4.10.jar' REGISTER '/home/hdoop/Escritorio/elephant-bird-core-4.10.jar' REGISTER '/home/hdoop/Escritorio/elephant-bird-hadoop-compat-4.10.jar' REGISTER '/home/hdoop/Escritorio/avro-1.11.0.jar' REGISTER '/home/hdoop/Escritorio/guava-31.0.1-jre.jar' REGISTER '/home/hdoop/Escritorio/piggybank-0.17.0.jar' tweets = LOAD '/hdoop/twitter_data' USING com.twitter.elephantbird.pig.load.JsonLoader('-nestedLoad') AS myMap; describe tweets; dump tweets;       ... View more