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https://issues.apache.org/jira/browse/DRILL-5512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017707#comment-16017707
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ASF GitHub Bot commented on DRILL-5512:
---------------------------------------

Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/838#discussion_r117532070
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/ScanBatch.java 
---
    @@ -213,17 +213,16 @@ public IterOutcome next() {
               try {
                 currentReader.allocate(mutator.fieldVectorMap());
               } catch (OutOfMemoryException e) {
    -            logger.debug("Caught OutOfMemoryException");
                 clearFieldVectorMap();
    -            return IterOutcome.OUT_OF_MEMORY;
    +            throw UserException.memoryError(e).build(logger);
               }
               addImplicitVectors();
             } catch (ExecutionSetupException e) {
    -          this.context.fail(e);
    --- End diff --
    
    This call triggers query failure (stopping the fragment, notifying the 
Foreman, and cancelling other fragments, etc.). What is the flow after this 
change?
    
    Similar changes below.


> Standardize error handling in ScanBatch
> ---------------------------------------
>
>                 Key: DRILL-5512
>                 URL: https://issues.apache.org/jira/browse/DRILL-5512
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.10.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>              Labels: ready-to-commit
>             Fix For: 1.10.0
>
>
> ScanBatch is the Drill operator executor that handles most readers. Like most 
> Drill operators, it uses an ad-hoc set of error detection and reporting 
> methods that evolved over Drill development.
> This ticket asks to standardize on error handling as outlined in DRILL-5083. 
> This basically means reporting all errors as a {{UserException}} rather than 
> using the {{IterOutcome.STOP}} return status or using the 
> {{FragmentContext.fail()}} method.
> This work requires the new error codes introduced in DRILL-5511, and is a 
> step toward making readers aware of vector size limits.



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