Problem with DID_NOT_FIND_LOAD_ONLY_MAP_PLAN --------------------------------------------
Key: PIG-1812 URL: https://issues.apache.org/jira/browse/PIG-1812 Project: Pig Issue Type: Bug Affects Versions: 0.8.0, 0.7.0 Environment: RHEL, Pig 0.8.0 Reporter: xianyu Hi, I have the following input files: pkg.txt a 3 {(123,1.0),(236,2.0)} a 3 {(236,1.0)} model.txt a 123 2 0.33 a 236 2 0.5 My script is listed below: A = load 'pkg.txt' using PigStorage('\t') as (pkg:chararray, ts:int, cat_bag:{t:(id:chararray, wht:float)}); M = load 'model.txt' using PigStorage('\t') as (pkg:chararray, cat_id:chararray, ts:int, score:double); B = foreach A generate ts, pkg, flatten(cat_bag.id) as (cat_id:chararray); B = distinct B; H1 = cogroup M by (pkg, cat_id) inner, B by (pkg, cat_id); H2 = foreach H1 { I = order M by ts; J = order B by ts; generate flatten(group) as (pkg:chararray, cat_id:chararray), J.ts as tsorig, I.ts as tsmap; } dump H2; When running this script, I got a warning about "Encountered Warning DID_NOT_FIND_LOAD_ONLY_MAP_PLAN 1 time(s)" and pig error log as below: Pig Stack Trace --------------- ERROR 2043: Unexpected error during execution. org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias H2 at org.apache.pig.PigServer.openIterator(PigServer.java:764) at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:612) at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:303) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:141) at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90) at org.apache.pig.Main.run(Main.java:500) at org.apache.pig.Main.main(Main.java:107) Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias H2 at org.apache.pig.PigServer.storeEx(PigServer.java:888) at org.apache.pig.PigServer.store(PigServer.java:826) at org.apache.pig.PigServer.openIterator(PigServer.java:738) ... 7 more Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 2043: Unexpected error during execution. at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:403) at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1208) at org.apache.pig.PigServer.storeEx(PigServer.java:884) ... 9 more Caused by: java.lang.ClassCastException: org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad cannot be cast to org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.SecondaryKeyOptimizer.visitMROp(SecondaryKeyOptimizer.java:352) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper.visit(MapReduceOper.java:246) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper.visit(MapReduceOper.java:41) at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:69) at org.apache.pig.impl.plan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:71) at org.apache.pig.impl.plan.DepthFirstWalker.walk(DepthFirstWalker.java:52) at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.compile(MapReduceLauncher.java:498) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:117) at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:378) ... 11 more But, when I removed the DISTINCT statement before COGROUP, i.e. "B = distinct B;" this script can run smoothly. I have also tried other reducer side operations like ORDER, it seems that they will also trigger above error. This is really very confusing. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.