Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/12697#discussion_r61051439
--- Diff: core/src/main/scala/org/apache/spark/metrics/sink/Slf4jSink.scala
---
@@ -25,6 +25,9 @@ import com.codahale.metrics.{MetricRegistry,
Slf4jReporter}
import org.apache.spark.SecurityManager
import org.apache.spark.metrics.MetricsSystem
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
--- End diff --
(It would be great if you run `sbt scalastyle` before adding some more
commits which shows up such things)
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