Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22473#discussion_r219941854
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -83,6 +83,17 @@ package object config {
private[spark] val EXECUTOR_CLASS_PATH =
ConfigBuilder(SparkLauncher.EXECUTOR_EXTRA_CLASSPATH).stringConf.createOptional
+ private[spark] val EXECUTOR_HEARTBEAT_DROP_ZERO_METRICS =
+
ConfigBuilder("spark.executor.heartbeat.dropZeroMetrics").booleanConf.createWithDefault(true)
--- End diff --
OK, it's an internal-only safety-valve flag.
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