diff --git a/mllib/src/main/scala/org/apache/spark/ml/clustering/BisectingKMeans.scala b/mllib/src/main/scala/org/apache/spark/ml/clustering/BisectingKMeans.scala
index 1ad4e097246a3..9c9614509c64f 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/clustering/BisectingKMeans.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/clustering/BisectingKMeans.scala
@@ -276,8 +276,7 @@ class BisectingKMeans @Since("2.0.0") (
     val summary = new BisectingKMeansSummary(
       model.transform(dataset), $(predictionCol), $(featuresCol), $(k))
     model.setSummary(Some(summary))
-    // TODO: need to extend logNamedValue to support Array
-    instr.logNamedValue("clusterSizes", summary.clusterSizes.mkString("[", ",", "]"))
+    instr.logNamedValue("clusterSizes", summary.clusterSizes)
     instr.logSuccess(model)
     model
   }
diff --git a/mllib/src/main/scala/org/apache/spark/ml/clustering/GaussianMixture.scala b/mllib/src/main/scala/org/apache/spark/ml/clustering/GaussianMixture.scala
index 3091bb5a2e54c..64ecc1ebda589 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/clustering/GaussianMixture.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/clustering/GaussianMixture.scala
@@ -426,8 +426,7 @@ class GaussianMixture @Since("2.0.0") (
       $(predictionCol), $(probabilityCol), $(featuresCol), $(k), logLikelihood)
     model.setSummary(Some(summary))
     instr.logNamedValue("logLikelihood", logLikelihood)
-    // TODO: need to extend logNamedValue to support Array
-    instr.logNamedValue("clusterSizes", summary.clusterSizes.mkString("[", ",", "]"))
+    instr.logNamedValue("clusterSizes", summary.clusterSizes)
     instr.logSuccess(model)
     model
   }
diff --git a/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala b/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
index e72d7f9485e6a..1704412741d49 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/clustering/KMeans.scala
@@ -359,8 +359,7 @@ class KMeans @Since("1.5.0") (
       model.transform(dataset), $(predictionCol), $(featuresCol), $(k))
 
     model.setSummary(Some(summary))
-    // TODO: need to extend logNamedValue to support Array
-    instr.logNamedValue("clusterSizes", summary.clusterSizes.mkString("[", ",", "]"))
+    instr.logNamedValue("clusterSizes", summary.clusterSizes)
     instr.logSuccess(model)
     if (handlePersistence) {
       instances.unpersist()
diff --git a/mllib/src/main/scala/org/apache/spark/ml/util/Instrumentation.scala b/mllib/src/main/scala/org/apache/spark/ml/util/Instrumentation.scala
index 467130b37c16e..3a1c166d46257 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/util/Instrumentation.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/util/Instrumentation.scala
@@ -132,6 +132,19 @@ private[spark] class Instrumentation[E <: Estimator[_]] private (
     log(compact(render(name -> value)))
   }
 
+  def logNamedValue(name: String, value: Array[String]): Unit = {
+    log(compact(render(name -> compact(render(value.toSeq)))))
+  }
+
+  def logNamedValue(name: String, value: Array[Long]): Unit = {
+    log(compact(render(name -> compact(render(value.toSeq)))))
+  }
+
+  def logNamedValue(name: String, value: Array[Double]): Unit = {
+    log(compact(render(name -> compact(render(value.toSeq)))))
+  }
+
+
   /**
    * Logs the successful completion of the training session.
    */