pan3793 commented on code in PR #51775:
URL: https://github.com/apache/spark/pull/51775#discussion_r2247532807
##########
common/utils/src/main/scala/org/apache/spark/internal/Logging.scala:
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@@ -182,6 +170,12 @@ trait Logging {
}
}
+ protected def MDC(key: LogKey, value: Any): MDC = {
+ require(!value.isInstanceOf[MessageWithContext],
+ "the class of value cannot be MessageWithContext")
+ new MDC(key, value)
+ }
Review Comment:
Since it's unable to write a class in Java that allows Scala to construct
instances without `new`, I create this method instead.
So, for logging in Scala
```scala
logInfo(log"Application ID is ${MDC(APP_ID, appId)}")
```
previously `MDC(APP_ID, appId)` calls `case class`'s constructor, now it
calls this method.
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