vanzin commented on a change in pull request #26170: [SPARK-29397][core] Extend
plugin interface to include the driver.
URL: https://github.com/apache/spark/pull/26170#discussion_r338783293
##########
File path: core/src/main/scala/org/apache/spark/SparkContext.scala
##########
@@ -539,6 +541,9 @@ class SparkContext(config: SparkConf) extends Logging {
_heartbeatReceiver = env.rpcEnv.setupEndpoint(
HeartbeatReceiver.ENDPOINT_NAME, new HeartbeatReceiver(this))
+ // Initialize any plugins before the task scheduler is initialized.
+ _plugins = PluginContainer(this)
Review comment:
Also, if you really want to, you can register metrics later. Just install a
listener and wait for the "application start" event. (You just need at least a
dummy metric registered here, or your source won't be initialized. But that can
be fixed easily.)
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