squito commented on a change in pull request #24132: [SPARK-27189][CORE] Add
Executor metrics and memory usage instrumentation to the metrics system
URL: https://github.com/apache/spark/pull/24132#discussion_r353990438
##########
File path: core/src/main/scala/org/apache/spark/SparkContext.scala
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@@ -629,9 +629,10 @@ class SparkContext(config: SparkConf) extends Logging {
_env.metricsSystem.registerSource(_dagScheduler.metricsSource)
_env.metricsSystem.registerSource(new
BlockManagerSource(_env.blockManager))
_env.metricsSystem.registerSource(new JVMCPUSource())
- if (executorMetricsSource != null) {
- executorMetricsSource.register
- env.metricsSystem.registerSource(executorMetricsSource)
+ _executorMetricsSource match {
+ case Some(executorMetricsSource: ExecutorMetricsSource) =>
+ executorMetricsSource.register(_env.metricsSystem)
+ case None => None
Review comment:
this is only called for the side effect, so you can use
```scala
_executorMetricsSource.foreach(_.register(_env.metricsSystem))
```
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