Github user eatoncys commented on the issue:
https://github.com/apache/spark/pull/18060
@srowen The other parameters are validated at some other places, for
example, the --executor-memory parameter is validated at
org.apache.spark.memory.UnifiedMemoryManager$.getMaxMemory, the app can exit
with error: "java.lang.NumberFormatException" if it is a negative number. But
the --total-executor-cores parameter is not validated at anywhere, the app can
not exit if it is a negative number.
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