cloud-fan commented on code in PR #54007:
URL: https://github.com/apache/spark/pull/54007#discussion_r2736031492
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core/src/main/scala/org/apache/spark/util/LazyTry.scala:
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@@ -45,17 +45,21 @@ import scala.util.Try
private[spark] class LazyTry[T](initialize: => T) extends Serializable {
private lazy val tryT: Try[T] = Utils.doTryWithCallerStacktrace { initialize
}
+ // Track whether the lazy val has been materialized or not.
+ @volatile private var materialized: Boolean = false
+
/**
* Get the lazy value. If the initialization block threw an exception, it
will be re-thrown here.
* The exception will be re-thrown with the current caller's stacktrace.
- * An exception with stack trace from when the exception was first thrown
can be accessed with
- * ```
- * ex.getSuppressed.find { e =>
- * e.getMessage ==
org.apache.spark.util.Utils.TRY_WITH_CALLER_STACKTRACE_FULL_STACKTRACE
- * }
- * ```
+ *
+ * On the first access, no suppressed exception is added. On subsequent
accesses, the original
+ * stacktrace is added as a suppressed exception to help with debugging.
*/
- def get: T = Utils.getTryWithCallerStacktrace(tryT)
+ def get: T = {
+ val isFirstAccess = !materialized
+ materialized = true
+ Utils.getTryWithCallerStacktrace(tryT, isFirstAccess)
Review Comment:
it's not thread-safe anyway, and `AtomicBoolean` takes more memory.
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