Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4872#discussion_r147657172
--- Diff:
flink-runtime/src/test/scala/org/apache/flink/runtime/testingUtils/TestingCluster.scala
---
@@ -42,7 +42,8 @@ import org.apache.flink.runtime.jobmanager.{JobManager,
MemoryArchivist, Submitt
import org.apache.flink.runtime.leaderelection.LeaderElectionService
import org.apache.flink.runtime.messages.JobManagerMessages
import org.apache.flink.runtime.messages.JobManagerMessages._
-import org.apache.flink.runtime.metrics.MetricRegistry
+import org.apache.flink.runtime.metrics.MetricRegistryImpl
--- End diff --
unused import
---
