[GitHub] [spark] HyukjinKwon commented on a change in pull request #24521: [SPARK-27629][PySpark] Prevent Unpickler from intervening each unpickling

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HyukjinKwon commented on a change in pull request #24521: [SPARK-27629][PySpark] Prevent Unpickler from intervening each unpickling
URL: https://github.com/apache/spark/pull/24521#discussion_r280956002
 
 

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 File path: core/src/main/scala/org/apache/spark/api/python/SerDeUtil.scala
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 @@ -186,6 +186,9 @@ private[spark] object SerDeUtil extends Logging {
       val unpickle = new Unpickler
       iter.flatMap { row =>
         val obj = unpickle.loads(row)
+        // `Opcodes.MEMOIZE` of Protocol 4 (Python 3.4+) will store objects in internal map
+        // of `Unpickler`. This map is cleared when calling `Unpickler.close()`.
+        unpickle.close()
 
 Review comment:
   Yea, I missed `Since each row is independent of the others` - so I thought we should manually control `memo`. I had to look deeper :D.  Looks fine. Yes, I guess just it needs an extra clear call for each row.

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