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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5083) RecordIterator can sometimes restart a query on close
Date Fri, 21 Jul 2017 14:25:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096303#comment-16096303
] 

ASF GitHub Bot commented on DRILL-5083:
---------------------------------------

Github user KulykRoman commented on the issue:

    https://github.com/apache/drill/pull/881
  
    @paul-rogers, I retested this situation and I was not able to reproduce infinite loop
with this fix (but I can reproduce it without the fix). So this fix solves the issue.


> RecordIterator can sometimes restart a query on close
> -----------------------------------------------------
>
>                 Key: DRILL-5083
>                 URL: https://issues.apache.org/jira/browse/DRILL-5083
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
>            Assignee: Roman
>            Priority: Minor
>         Attachments: DrillOperatorErrorHandlingRedesign.pdf
>
>
> This one is very confusing...
> In a test with a MergeJoin and external sort, operators are stacked something like this:
> {code}
> Screen
> - MergeJoin
> - - External Sort
> ...
> {code}
> Using the injector to force a OOM in spill, the external sort threw a UserException up
the stack. This was handed by:
> {code}
> IteratorValidatorBatchIterator.next( )
> RecordIterator.clearInflightBatches( )
> RecordIterator.close( )
> MergeJoinBatch.close( )
> {code}
> Which does the following:
> {code}
>       // Check whether next() should even have been called in current state.
>       if (null != exceptionState) {
>         throw new IllegalStateException(
> {code}
> But, the exceptionState is set, so we end up throwing an IllegalStateException during
cleanup.
> Seems the code should agree: if {{next( )}} will be called during cleanup, then {{next(
)}} should gracefully handle that case.



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