Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/19269#discussion_r144821527
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/sources/v2/SimpleWritableDataSource.scala
---
@@ -0,0 +1,254 @@
+/*
+ * 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.sql.sources.v2
+
+import java.io.{BufferedReader, InputStreamReader}
+import java.text.SimpleDateFormat
+import java.util.{Collections, Date, List => JList, Locale, Optional, UUID}
+
+import scala.collection.JavaConverters._
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{FileSystem, Path}
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.{Row, SaveMode}
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.sources.v2.reader.{DataReader,
DataSourceV2Reader, ReadTask}
+import org.apache.spark.sql.sources.v2.writer._
+import org.apache.spark.sql.types.{DataType, StructType}
+import org.apache.spark.util.SerializableConfiguration
+
+/**
+ * A HDFS based transactional writable data source.
+ * Each task writes data to
`target/_temporary/jobId/$jobId-$partitionId-$attemptNumber`.
+ * Each job moves files from `target/_temporary/jobId/` to `target`.
+ */
+class SimpleWritableDataSource extends DataSourceV2 with ReadSupport with
WriteSupport {
+
+ private val schema = new StructType().add("i", "long").add("j", "long")
+
+ class Reader(path: String, conf: Configuration) extends
DataSourceV2Reader {
+ override def readSchema(): StructType = schema
+
+ override def createReadTasks(): JList[ReadTask[Row]] = {
+ val dataPath = new Path(path)
+ val fs = dataPath.getFileSystem(conf)
+ if (fs.exists(dataPath)) {
+
fs.listStatus(dataPath).filter(!_.getPath.getName.startsWith("_")).map { f =>
--- End diff --
Consider also filtering startsWith(.), in case that gets picked up on
localFS.
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