[jira] [Updated] (PIG-2827) TOP exception bug

["Haitao Yao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Haitao Yao updated PIG-2827:
----------------------------

    Attachment: TOP.patch

here's my patch.
                
> TOP exception bug
> -----------------
>
>                 Key: PIG-2827
>                 URL: https://issues.apache.org/jira/browse/PIG-2827
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Haitao Yao
>         Attachments: TOP.patch
>
>
> the current exception will swallow the inner exception's stacktrace like this:
> java.lang.RuntimeException: General Exception executing function: java.lang.NullPointerException
> 	at org.apache.pig.builtin.TOP.exec(TOP.java:133)
> 	at org.apache.pig.builtin.TOP.exec(TOP.java:1)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:216)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:258)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:233)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:460)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:428)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:408)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:1)
> 	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
> 	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:650)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
> 	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:415)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1131)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:249)
> we can not locate the real errors.

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