Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/20906#discussion_r177244722 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousWriteExec.scala --- @@ -0,0 +1,122 @@ +/* + * 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.streaming.continuous + +import scala.util.control.NonFatal + +import org.apache.spark.{SparkEnv, SparkException, TaskContext} +import org.apache.spark.internal.Logging +import org.apache.spark.rdd.RDD +import org.apache.spark.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.expressions.Attribute +import org.apache.spark.sql.execution.SparkPlan +import org.apache.spark.sql.execution.datasources.v2.{DataWritingSparkTask, InternalRowDataWriterFactory} +import org.apache.spark.sql.execution.datasources.v2.DataWritingSparkTask.{logError, logInfo} +import org.apache.spark.sql.execution.streaming.StreamExecution +import org.apache.spark.sql.sources.v2.writer._ +import org.apache.spark.sql.sources.v2.writer.streaming.StreamWriter +import org.apache.spark.util.Utils + +case class ContinuousWriteExec(writer: StreamWriter, query: SparkPlan) + extends SparkPlan with Logging { + override def children: Seq[SparkPlan] = Seq(query) + override def output: Seq[Attribute] = Nil + + override protected def doExecute(): RDD[InternalRow] = { + val writerFactory = writer match { + case w: SupportsWriteInternalRow => w.createInternalRowWriterFactory() + case _ => new InternalRowDataWriterFactory(writer.createWriterFactory(), query.schema) + } + + val rdd = query.execute() + val messages = new Array[WriterCommitMessage](rdd.partitions.length) + + logInfo(s"Start processing data source writer: $writer. " + + s"The input RDD has ${messages.length} partitions.") + EpochCoordinatorRef.get( --- End diff -- nit: Add comment on what this does.
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