Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2432#discussion_r18370600
--- Diff: core/src/main/scala/org/apache/spark/SparkEnv.scala ---
@@ -261,9 +261,13 @@ object SparkEnv extends Logging {
val metricsSystem = if (isDriver) {
MetricsSystem.createMetricsSystem("driver", conf, securityManager)
--- End diff --
Need to add a comment here to explain why we don't initialize it right away
if it's the driver (i.e. we need to wait for the task scheduler to give us an
app ID)
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