HyukjinKwon commented on issue #21977: [SPARK-25004][CORE] Add spark.executor.pyspark.memory limit. URL: https://github.com/apache/spark/pull/21977#issuecomment-456163212 > If the threshold for spilling is the total size limit, then Python would run out of memory before it started spilling data. Oh, BTW, I don't think it's true since it already uses less memory then what it sets. https://github.com/apache/spark/blob/c2d0d700b551e864bb7b2ae2a175ec8ade704488/python/pyspark/rdd.py#L1761-L1762 https://github.com/apache/spark/blob/c2d0d700b551e864bb7b2ae2a175ec8ade704488/python/pyspark/rdd.py#L626 https://github.com/apache/spark/blob/c2d0d700b551e864bb7b2ae2a175ec8ade704488/python/pyspark/rdd.py#L654
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