dongjoon-hyun commented on a change in pull request #25770: [SPARK-29064][CORE]
Add PrometheusResource to export Executor metrics
URL: https://github.com/apache/spark/pull/25770#discussion_r323859488
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File path: core/src/main/scala/org/apache/spark/internal/config/UI.scala
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@@ -81,6 +81,12 @@ private[spark] object UI {
.booleanConf
.createWithDefault(true)
+ val UI_PROMETHEUS_ENABLED = ConfigBuilder("spark.ui.prometheus.enabled")
Review comment:
In general, that's better. However, here, that will introduce another
dependency between `org.apache.spark.ui` and `org.apache.spark.metrics`
modules. Technically, `SparkEnv.create` creates
`MetricsSystem.createMetricsSystem` and doesn't expose it to the other modules.
In addition, `MetricsConfig` exists inside that `MetricsSystem` instance as
`private[this] val metricsConfig`.
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