Github user skonto commented on a diff in the pull request:
https://github.com/apache/spark/pull/21516#discussion_r194687233
--- Diff:
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterSchedulerSource.scala
---
@@ -17,25 +17,170 @@
package org.apache.spark.scheduler.cluster.mesos
-import com.codahale.metrics.{Gauge, MetricRegistry}
+import java.util.concurrent.TimeUnit
+import java.util.Date
+import scala.collection.mutable.HashMap
+
+import com.codahale.metrics.{Counter, Gauge, MetricRegistry, Timer}
--- End diff --
Counter is unused import.
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