amanomer commented on a change in pull request #26454: [SPARK-29818][MLLIB] 
Missing persist on RDD
URL: https://github.com/apache/spark/pull/26454#discussion_r345570774
 
 

 ##########
 File path: 
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala
 ##########
 @@ -138,6 +138,7 @@ final class EMLDAOptimizer extends LDAOptimizer {
     this.docConcentration = if (docConcentration == -1) (50.0 / k) + 1.0 else 
docConcentration
     this.topicConcentration = if (topicConcentration == -1) 1.1 else 
topicConcentration
     val randomSeed = lda.getSeed
+    docs.persist()
 
 Review comment:
   `docs` is user input hence persist not required.
   
https://github.com/apache/spark/blob/80fbc382a60973db21367a922a0fb797e5ab382d/mllib/src/main/scala/org/apache/spark/mllib/clustering/LDA.scala#L331

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