Github user srowen commented on the issue:
https://github.com/apache/spark/pull/13543
The thing is, `SPARK_MASTER_HOST` is not used anywhere in the code but this
file. It's not documented. I would imagine it is the one that's deprecated,
but, have a look at https://issues.apache.org/jira/browse/SPARK-3474 In any
event, I wonder if we should finally standardize on SPARK_MASTER_HOST? It's as
if these two should literally be flipped everywhere in the code, and then this
line would generate a warning perhaps if SPARK_MASTER_IP is set?
https://github.com/bomeng/spark/blob/master/core/src/main/scala/org/apache/spark/deploy/master/MasterArguments.scala#L35
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