ijuma commented on a change in pull request #8517:
URL: https://github.com/apache/kafka/pull/8517#discussion_r413076253



##########
File path: core/src/main/scala/kafka/utils/DelayedItem.scala
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@@ -21,24 +21,19 @@ import java.util.concurrent._
 
 import org.apache.kafka.common.utils.Time
 
-import scala.math._
+class DelayedItem(val delayMs: Long, val time: Time) extends Logging {
+  def this(delayMs: Long) = this(delayMs, Time.SYSTEM)

Review comment:
       It should pass the actual `time` instance so that we can mock if we 
want. It has one in its constructor already:
   
   ```scala
   class ReplicaFetcherThread(name: String,
                              fetcherId: Int,
                              sourceBroker: BrokerEndPoint,
                              brokerConfig: KafkaConfig,
                              failedPartitions: FailedPartitions,
                              replicaMgr: ReplicaManager,
                              metrics: Metrics,
                              time: Time,
   ```




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