[SPARK-28592] Mark new Shuffle apis as @Experimental (instead of @Private)

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.1.0
• Component/s: Shuffle, Spark Core
• Assignee: Unassigned
• Reporter: Imran Rashid
• Created: 01/Aug/19 13:55
• Updated: 29/Mar/20 02:48

Description

The new Shuffle api is initially marked as @Private, just to discourage anyone from trying to make use of it before all the pieces are in place (in particular if spark 3.0 is released before everything is merged).  But once its all merged we can change to @Experimental