Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21758#discussion_r204308535
--- 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 {
+
+ /**
+ * :: Experimental ::
+ * Sets a global barrier and waits until all tasks in this stage hit
this barrier. Similar to
+ * MPI_Barrier function in MPI, the barrier() function call blocks until
all tasks in the same
+ * stage have reached this routine.
+ */
+ @Experimental
+ @Since("2.4.0")
+ def barrier(): Unit
+
+ /**
+ * :: Experimental ::
+ * Returns the all task infos in this barrier stage, the task infos are
ordered by partitionId.
--- End diff --
is there a particular reason why they must be ordered by partitionId?
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