Xianjin YE created SPARK-33756:
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Summary: 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
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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