Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/15374#discussion_r82249178
--- 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 probably should have said do we want to say something like classes not
annotated are considered Unstable. This would just cover if we missed
something or clarify to the user if they found a class that wasn't annotated.
It really only applies once we have the Audience tag and what those
audience tags are. You could have a tag that is for internal Spark
developers/components (not applications using spark) which would apply to other
components or components really closely tied to Spark (perhaps Bahir). In the
Hadoop world some things are considered limited private (which I don't think we
should use that tag) but are allowed to use some interfaces end user is not.
Not a big deal at this point.
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