@@ -0,0 +1,1720 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one or more%0A * contributor license agreements.  See the NOTICE file distributed with%0A * this work for additional information regarding copyright ownership.%0A * The ASF licenses this file to You under the Apache License, Version 2.0%0A * (the %22License%22); you may not use this file except in compliance with%0A * the License.  You may obtain a copy of the License at%0A *%0A *    http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.apache.spark.annotation;%0A%0Aimport java.lang.annotation.Documented;%0A%0A/**%0A * Annotation to inform users of how much to rely on a particular package,%0A * class or method not changing over time.%0A */%0Apublic class InterfaceStability %7B%0A%0A  /**%0A   * Stable APIs that retain source and binary compatibility within a major release.%0A   * These interfaces can change from one major release to another major release%0A   * (e.g. from 1.0 to 2.0).%0A   */%0A  @Documented%0A  public @interface Stable %7B%7D;%0A%0A  /**%0A   * APIs that are meant to evolve towards becoming stable APIs, but are not stable APIs yet.%0A   * Evolving interfaces can change from one feature release to another release (i.e. 2.1 to 2.2).%0A   */%0A  @Documented%0A  public @interface Evolving %7B%7D;%0A%0A  /**%0A   * Unstable APIs, with no guarantee on stability.%0A   * Classes that are unannotated are considered Unstable.%0A   */%0A  @Documented%0A  public @interface Unstable %7B%7D;%0A%7D%0A

Introduce InterfaceStability annotation