Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/21066#discussion_r186482587
--- Diff:
hadoop-cloud/src/hadoop-3/main/scala/org/apache/spark/internal/io/cloud/package.scala
---
@@ -0,0 +1,105 @@
+/*
+ * 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.internal.io
+
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.internal.SQLConf
+
+/**
+ * Package object to assist in switching to the Hadoop Hadoop 3
+ * [[org.apache.hadoop.mapreduce.lib.output.PathOutputCommitterFactory]]
factory
+ * mechanism for dynamically loading committers for the destination stores.
+ *
+ * = Using Alternative Committers with Spark and Hadoop 3 =
--- End diff --
yep. It is needed in the docs, with `docs/cloud-integration.md` the obvious
place. But really that "build on Hadoop 3.1" is a prereq, isn't it?
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