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.
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