Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10835#discussion_r50642789
--- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala
---
@@ -39,68 +37,144 @@ import org.apache.spark.util.Utils
*
* So, when adding new fields, take into consideration that the whole
object can be serialized for
* shipping off at any time to consumers of the SparkListener interface.
+ *
+ * @param initialAccums the initial set of accumulators that this
[[TaskMetrics]] depends on.
+ * Each accumulator in this initial set must be
uniquely named and marked
+ * as internal. Additional accumulators registered
later need not satisfy
--- End diff --
You could add a `require` in the constructor which checks that each of
these metrics is actually internal.
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