Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15374#discussion_r82243978
--- Diff:
common/tags/src/main/java/org/apache/spark/annotation/InterfaceStability.java
---
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
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+ * The ASF licenses this file to You under the Apache License, Version 2.0
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+ */
+
+package org.apache.spark.annotation;
+
+import java.lang.annotation.Documented;
+
+/**
+ * Annotation to inform users of how much to rely on a particular package,
+ * class or method not changing over time.
--- End diff --
I am not including the InterfaceAudience change for now since it is less
clear what the "audience" should be. In addition, the biggest bang for the buck
does come from this stability annotation, and less from audience.
For private APIs -- what are the reasons you think we should annotate
private APIs with stability levels?
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