Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/21066#discussion_r186467007
--- Diff:
hadoop-cloud/src/hadoop-3/main/scala/org/apache/spark/internal/io/cloud/PathOutputCommitProtocol.scala
---
@@ -0,0 +1,260 @@
+/*
+ * 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.cloud
+
+import java.io.IOException
+
+import org.apache.hadoop.fs.Path
+import org.apache.hadoop.mapreduce.{JobContext, TaskAttemptContext}
+import org.apache.hadoop.mapreduce.lib.output.{FileOutputCommitter,
PathOutputCommitter, PathOutputCommitterFactory}
+
+import org.apache.spark.internal.io.{FileCommitProtocol,
HadoopMapReduceCommitProtocol}
+import org.apache.spark.internal.io.FileCommitProtocol.TaskCommitMessage
+
+/**
+ * Spark Commit protocol for Path Output Committers.
+ * This committer will work with the `FileOutputCommitter` and subclasses.
+ * All implementations *must* be serializable.
+ *
+ * Rather than ask the `FileOutputFormat` for a committer, it uses the
+ * `org.apache.hadoop.mapreduce.lib.output.PathOutputCommitterFactory`
factory
+ * API to create the committer.
+ * This is what
[[org.apache.hadoop.mapreduce.lib.output.FileOutputFormat]] does,
+ * but as [[HadoopMapReduceCommitProtocol]] still uses the original
+ * `org.apache.hadoop.mapred.FileOutputFormat` binding
+ * subclasses do not do this, overrides those subclasses to using the
+ * factory mechanism now supported in the base class.
+ *
+ * In `setupCommitter` the factory is bonded to and the committer for
+ * the destination path chosen.
+ *
+ * @constructor Instantiate. dynamic partition overwrite is not supported,
+ * so that committers for stores which do not support rename
+ * will not get confused.
+ * @param jobId job
+ * @param destination destination
+ * @param dynamicPartitionOverwrite does the caller want support for
dynamic
+ * partition overwrite. If so, it will be
+ * refused.
+ * @throws IOException when an unsupported dynamicPartitionOverwrite
option is supplied.
+ */
+class PathOutputCommitProtocol(
+ jobId: String,
+ destination: String,
+ dynamicPartitionOverwrite: Boolean = false)
+ extends HadoopMapReduceCommitProtocol(
+ jobId,
+ destination,
+ false) with Serializable {
+
+ @transient var committer: PathOutputCommitter = _
+
+ require(destination != null, "Null destination specified")
+
+ val destPath = new Path(destination)
+
+ logInfo(s"Instantiated committer with job ID=$jobId;" +
+ s" destination=$destPath;" +
+ s" dynamicPartitionOverwrite=$dynamicPartitionOverwrite")
+
+ if (dynamicPartitionOverwrite) {
+ // until there's explicit extensions to the PathOutputCommitProtocols
+ // to support the spark mechanism, it's left to the individual
committer
+ // choice to handle partitioning.
+ throw new IOException("PathOutputCommitProtocol does not support
dynamicPartitionOverwrite")
+ }
+
+ import PathOutputCommitProtocol._
+
+ /**
+ * Set up the committer.
+ * This creates it by talking directly to the Hadoop factories, instead
+ * of the V1 `mapred.FileOutputFormat` methods.
+ * @param context task attempt
+ * @return the committer to use. This will always be a subclass of
+ * [[PathOutputCommitter]].
+ */
+ override protected def setupCommitter(
+ context: TaskAttemptContext): PathOutputCommitter = {
+
+ logInfo(s"Setting up committer for path $destination")
+ committer = PathOutputCommitterFactory.createCommitter(destPath,
context)
+
+ // Special feature to force out the FileOutputCommitter, so as to
guarantee
+ // that the binding is working properly.
+ val rejectFileOutput = context.getConfiguration
+ .getBoolean(REJECT_FILE_OUTPUT, REJECT_FILE_OUTPUT_DEFVAL)
+ if (rejectFileOutput && committer.isInstanceOf[FileOutputCommitter]) {
+ // the output format returned a file output format committer, which
+ // is exactly what we do not want. So switch back to the factory.
+ val factory = PathOutputCommitterFactory.getCommitterFactory(
+ destPath,
+ context.getConfiguration)
+ logInfo(s"Using committer factory $factory")
+ committer = factory.createOutputCommitter(destPath, context)
+ }
+
+ logInfo(s"Using committer ${committer.getClass}")
+ logInfo(s"Committer details: $committer")
+ if (committer.isInstanceOf[FileOutputCommitter]) {
+ require(!rejectFileOutput,
+ s"Committer created is the FileOutputCommitter $committer")
+
+ if (committer.isCommitJobRepeatable(context)) {
+ // If FileOutputCommitter says its job commit is repeatable, it
means
+ // it is using the v2 algorithm, which is not safe for task commit
+ // failures. Warn
+ logWarning(s"Committer $committer may not be tolerant of task
commit failures")
+ }
+ }
+ committer
+ }
+
+ /**
+ * Create a temporary file for a task.
+ *
+ * @param taskContext task context
+ * @param dir optional subdirectory
+ * @param ext file extension
+ * @return a path as a string
+ */
+ override def newTaskTempFile(
+ taskContext: TaskAttemptContext,
--- End diff --
'again, done. I need to work out how to get IDEA to do this...
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