Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4708#discussion_r25145735
--- Diff: core/src/main/scala/org/apache/spark/scheduler/ResultStage.scala
---
@@ -0,0 +1,41 @@
+/*
+ * 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.scheduler
+
+import org.apache.spark.rdd.RDD
+import org.apache.spark.util.CallSite
+
+/**
+ * Define a class that represents the ResultStage to help clean up the
DAGScheduler class
+ */
+private[spark] class ResultStage(
+ override val id: Int,
+ override val rdd: RDD[_],
+ override val numTasks: Int,
+ override val parents: List[Stage],
+ override val jobId: Int,
+ override val callSite: CallSite)
+ extends Stage(id, rdd, numTasks, parents, jobId, callSite) {
+
+ /** For stages that are the final (consists of only ResultTasks), link
to the ActiveJob. */
--- End diff --
Now that this field is only present in the new ResultStage class, maybe we
could update this comment to say something like "Links to the active job for
this result stage."
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