diff --git a/core/src/main/scala/org/apache/spark/deploy/history/EventLogFileWriters.scala b/core/src/main/scala/org/apache/spark/deploy/history/EventLogFileWriters.scala
index f3bb6d5af335..990ab680f3aa 100644
--- a/core/src/main/scala/org/apache/spark/deploy/history/EventLogFileWriters.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/history/EventLogFileWriters.scala
@@ -187,12 +187,7 @@ object EventLogFileWriter {
   }
 
   def nameForAppAndAttempt(appId: String, appAttemptId: Option[String]): String = {
-    val base = Utils.sanitizeDirName(appId)
-    if (appAttemptId.isDefined) {
-      base + "_" + Utils.sanitizeDirName(appAttemptId.get)
-    } else {
-      base
-    }
+    Utils.nameForAppAndAttempt(appId, appAttemptId)
   }
 
   def codecName(log: Path): Option[String] = {
diff --git a/core/src/main/scala/org/apache/spark/util/Utils.scala b/core/src/main/scala/org/apache/spark/util/Utils.scala
index 536c6b4447aa..1efe181a8c38 100644
--- a/core/src/main/scala/org/apache/spark/util/Utils.scala
+++ b/core/src/main/scala/org/apache/spark/util/Utils.scala
@@ -2954,6 +2954,15 @@ private[spark] object Utils
     str.replaceAll("[ :/]", "-").replaceAll("[.${}'\"]", "_").toLowerCase(Locale.ROOT)
   }
 
+  def nameForAppAndAttempt(appId: String, appAttemptId: Option[String]): String = {
+    val base = sanitizeDirName(appId)
+    if (appAttemptId.isDefined) {
+      base + "_" + sanitizeDirName(appAttemptId.get)
+    } else {
+      base
+    }
+  }
+
   def isClientMode(conf: SparkConf): Boolean = {
     "client".equals(conf.get(SparkLauncher.DEPLOY_MODE, "client"))
   }