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https://issues.apache.org/jira/browse/SPARK-33756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247802#comment-17247802
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Apache Spark commented on SPARK-33756:
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User 'advancedxy' has created a pull request for this issue:
https://github.com/apache/spark/pull/30728
> BytesToBytesMap's iterator hasNext method should be idempotent.
> ---------------------------------------------------------------
>
> Key: SPARK-33756
> URL: https://issues.apache.org/jira/browse/SPARK-33756
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Xianjin YE
> Priority: Minor
>
> BytesToBytesMap's MapIterator's hasNext method is not idempotent.
> {code:java}
> //
> public boolean hasNext() {
> if (numRecords == 0) {
> if (reader != null) {
> // if called multiple multiple times, it will throw NoSuchElement
> exception
> handleFailedDelete();
> }
> }
> return numRecords > 0;
> }
> {code}
> Multiple calls to this `hasNext` method will call `handleFailedDelete()`
> multiple times, which will throw NoSuchElementException as the spillWrites
> has already been empty.
>
> We observed this issue for in one of our production jobs after upgrading to
> Spark 3.0
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