[jira] [Created] (SPARK-33756) BytesToBytesMap's iterator hasNext method should be idempotent.

["Xianjin YE (Jira)" <ji...@apache.org>]

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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