Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16827#discussion_r99743099
--- Diff: core/src/main/scala/org/apache/spark/SparkConf.scala ---
@@ -779,6 +781,30 @@ private[spark] object SparkConf extends Logging {
}
/**
+ * check if the given config key-value is valid.
+ */
+ def checkValidSetting(key: String, value: String, conf: SparkConf): Unit
= {
+ if (key.equals("spark.master")) {
+ // First, there is no need to set 'spark.master' multi-times with
different values.
+ // Second, It is possible for users to set the different
'spark.master' in code with
+ // `spark-submit` command, and will confuse users.
+ // So, we should do once check if the 'spark.master' already exists
in settings and if
+ // the previous value is the same with current value. Throw a
IllegalArgumentException when
+ // previous value is different with current value.
+ val previousOne = try {
+ Some(conf.get(key))
+ } catch {
+ case e: NoSuchElementException =>
+ None
+ }
+ if (previousOne.isDefined && !previousOne.get.equals(value)) {
+ throw new IllegalArgumentException(s"'spark.master' should not be
set with different " +
+ s"value, previous value is ${previousOne.get} and current value
is $value")
+ }
--- End diff --
here, we choose to throw IllegalArgumentException to fail job. Besides, we
can also choose to log a warning in a gentle way.
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