Github user ksakellis commented on a diff in the pull request:
https://github.com/apache/spark/pull/4067#discussion_r23065399
--- Diff:
core/src/main/scala/org/apache/spark/util/interceptingIterator.scala ---
@@ -0,0 +1,82 @@
+/*
+ * 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.util
+
+/**
+ * A Wrapper for iterators where a caller can get hooks before/after
+ * iterator methods.
+ * @param sub The iterator being wrapped.
+ * @tparam A the iterable type
+ */
+private[spark]
+class InterceptingIterator[A](sub: Iterator[A]) extends Iterator[A] {
--- End diff --
So this is supposed to be a generic way of intercepting iterators. If we
don't have this, i'd have to do something custom like CompletionIterator - i
was trying to make something reusable.
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