xy2953396112 commented on a change in pull request #26693: [MINOR][SS] Note 
that writer should not be closed in RateStreamMicroBatchStream.serialize
URL: https://github.com/apache/spark/pull/26693#discussion_r352402911
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/RateStreamMicroBatchStream.scala
 ##########
 @@ -63,6 +63,7 @@ class RateStreamMicroBatchStream(
     val metadataLog =
       new HDFSMetadataLog[LongOffset](session.get, checkpointLocation) {
         override def serialize(metadata: LongOffset, out: OutputStream): Unit 
= {
+          // Writer should not close the given stream when overriding methods.
 
 Review comment:
   > Can you move this comment into the doc in the method as pointed out?
   
   Such as:
      // Writer should not close the given stream when overriding methods.
      override def serialize(metadata: LongOffset, out: OutputStream): Unit = { 
   
   is ok?
   

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