Github user LantaoJin commented on the issue:
https://github.com/apache/spark/pull/19933
And **spark.driver.host** can be set to sparkConf, why spark.submit.host
can not be.
`def makeDriverRef(name: String, conf: SparkConf, rpcEnv: RpcEnv):
RpcEndpointRef = {`
` val driverHost: String = conf.get("spark.driver.host", "localhost")`
` val driverPort: Int = conf.getInt("spark.driver.port", 7077)`
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