dongjoon-hyun edited a comment on pull request #29078:
URL: https://github.com/apache/spark/pull/29078#issuecomment-657736058


   @srowen .  Interestingly, the root cause of the failure is the following 
inside `ContinuousMemoryStream`. Can we revert `.map(_.toSeq)` and use a 
different approach?
   ```scala
     private val records = Seq.fill(numPartitions)(new ListBuffer[UnsafeRow])
   - private val recordEndpoint = new ContinuousRecordEndpoint(records, this)
   + private val recordEndpoint = new 
ContinuousRecordEndpoint(records.map(_.toSeq), this)
   ```


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