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https://issues.apache.org/jira/browse/PIG-2827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418459#comment-13418459
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Jonathan Coveney commented on PIG-2827:
---------------------------------------
+1. We want to get rid of all of these cases where exceptions are swallowed,
good catch
> 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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