HyukjinKwon commented on a change in pull request #28395:
URL: https://github.com/apache/spark/pull/28395#discussion_r417002980



##########
File path: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
##########
@@ -168,6 +168,23 @@ private[spark] object PythonRDD extends Logging {
     serveIterator(rdd.collect().iterator, s"serve RDD ${rdd.id}")
   }
 
+  /**
+   * A helper function to collect an RDD as an iterator, then serve it via 
socket.
+   * This method is similar with `PythonRDD.collectAndServe`, but user can 
specify job group id,
+   * job description, and interruptOnCancel option.
+   *
+   * Note: This method are temporary, might be removed in future.

Review comment:
       We can use Unstable mark too.

##########
File path: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
##########
@@ -168,6 +168,23 @@ private[spark] object PythonRDD extends Logging {
     serveIterator(rdd.collect().iterator, s"serve RDD ${rdd.id}")
   }
 
+  /**
+   * A helper function to collect an RDD as an iterator, then serve it via 
socket.
+   * This method is similar with `PythonRDD.collectAndServe`, but user can 
specify job group id,
+   * job description, and interruptOnCancel option.
+   *
+   * Note: This method are temporary, might be removed in future.

Review comment:
       We can use Unstable mark instead.




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