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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1812) Problem with DID_NOT_FIND_LOAD_ONLY_MAP_PLAN
Date Thu, 27 Jan 2011 06:17:45 GMT

     [ https://issues.apache.org/jira/browse/PIG-1812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-1812:
----------------------------

    Attachment: PIG-1812-2.patch

> 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: 0.7.0, 0.8.0
>         Environment: RHEL, Pig 0.8.0
>            Reporter: xianyu
>            Assignee: Daniel Dai
>         Attachments: PIG-1812-1.patch, PIG-1812-2.patch
>
>
> 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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