Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/19448#discussion_r143894921 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetCommitterSuite.scala --- @@ -0,0 +1,149 @@ +/* + * 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.execution.datasources.parquet + +import java.io.FileNotFoundException + +import org.apache.hadoop.conf.Configuration +import org.apache.hadoop.fs.{FileStatus, Path} +import org.apache.hadoop.mapreduce.{JobContext, TaskAttemptContext} +import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter +import org.apache.parquet.hadoop.{ParquetOutputCommitter, ParquetOutputFormat} + +import org.apache.spark.{LocalSparkContext, SparkFunSuite} +import org.apache.spark.sql.SparkSession +import org.apache.spark.sql.internal.SQLConf +import org.apache.spark.sql.test.SQLTestUtils + +/** + * Test logic related to choice of output commtters + */ +class ParquetCommitterSuite extends SparkFunSuite with SQLTestUtils + with LocalSparkContext { + + private val PARQUET_COMMITTER = classOf[ParquetOutputCommitter].getCanonicalName + + protected var spark: SparkSession = _ + + /** + * Create a new [[SparkSession]] running in local-cluster mode with unsafe and codegen enabled. + */ + override def beforeAll(): Unit = { + super.beforeAll() + spark = SparkSession.builder() + .master("local-cluster[2,1,1024]") + .appName("testing") + .getOrCreate() + } + + override def afterAll(): Unit = { + spark.stop() + spark = null + } + + test("alternative output committer, merge schema") { + intercept[RuntimeException] { + val stat = writeDataFrame(MarkingFileOutput.COMMITTER, true, true) + logError(s"Created marker file $stat") + } + } + + test("alternative output committer, no merge schema") { + writeDataFrame(MarkingFileOutput.COMMITTER, false, true) + } + + test("Parquet output committer, merge schema") { + writeDataFrame(PARQUET_COMMITTER, true, false) + } + + test("Parquet output committer, no merge schema") { + writeDataFrame(PARQUET_COMMITTER, false, false) + } + + /** + * Write a trivial dataframe as Parquet, using the given committer + * and job summary option. + * @param committer committer to use + * @param summary create a job summary + * @param check look for a marker file + * @return if a marker file was sought, it's file status. + */ + private def writeDataFrame( + committer: String, + summary: Boolean, + check: Boolean): Option[FileStatus] = { + var result: Option[FileStatus] = None + withSQLConf( + SQLConf.PARQUET_OUTPUT_COMMITTER_CLASS.key -> committer, + ParquetOutputFormat.ENABLE_JOB_SUMMARY -> summary.toString) { + withTempPath { dest => + val df = spark.createDataFrame(Seq((1, "4"), (2, "2"))) + val destPath = new Path(dest.toURI) + df.write.format("parquet").save(destPath.toString) + if (check) { + result = Some(MarkingFileOutput.checkMarker( + destPath, + spark.sparkContext.hadoopConfiguration)) + } + } + } + result + } +} + +/** + * A file output committer which explicitly touches a file "marker"; this + * is how tests can verify that this committer was used. + * @param outputPath output path + * @param context task context + */ +private class MarkingFileOutputCommitter( + outputPath: Path, + context: TaskAttemptContext) extends FileOutputCommitter(outputPath, context) { + + override def commitJob(context: JobContext): Unit = { + super.commitJob(context) + MarkingFileOutput.touch(outputPath, context.getConfiguration) + } +} + +private object MarkingFileOutput { + + val COMMITTER = classOf[MarkingFileOutputCommitter].getCanonicalName --- End diff -- Maybe just`val committer`.
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