CVE-2019-10099: Cleartext Storage of Sensitive Information

Prior to Spark 2.3.3, in certain situations Spark would write user data to local disk unencrypted, even if spark.io.encryption.enabled=true. This includes cached blocks that are fetched to disk controlled by spark.maxRemoteBlockSizeFetchToMem; in SparkR, using parallelize; in Pyspark, using...