Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/21758#discussion_r206746905 --- Diff: core/src/main/scala/org/apache/spark/BarrierTaskContext.scala --- @@ -0,0 +1,42 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.spark + +import org.apache.spark.annotation.{Experimental, Since} + +/** A [[TaskContext]] with extra info and tooling for a barrier stage. */ +trait BarrierTaskContext extends TaskContext { --- End diff -- Please check the generated JavaDoc. I think it becomes a Java interface with only two methods defined here. We might want to define `class BarrierTaskContext` directly.
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