spark PackedRowWriterFactory 源码
spark PackedRowWriterFactory 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/PackedRowWriterFactory.scala
/*
* 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.sources
import scala.collection.mutable
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.connector.write.{DataWriter, WriterCommitMessage}
import org.apache.spark.sql.connector.write.streaming.StreamingDataWriterFactory
/**
* A simple [[org.apache.spark.sql.connector.write.DataWriterFactory]] whose tasks just pack rows
* into the commit message for delivery to a
* [[org.apache.spark.sql.connector.write.BatchWrite]] on the driver.
*
* Note that, because it sends all rows to the driver, this factory will generally be unsuitable
* for production-quality sinks. It's intended for use in tests.
*/
case object PackedRowWriterFactory extends StreamingDataWriterFactory {
override def createWriter(
partitionId: Int,
taskId: Long,
epochId: Long): DataWriter[InternalRow] = {
new PackedRowDataWriter()
}
}
/**
* Commit message for a [[PackedRowDataWriter]], containing all the rows written in the most
* recent interval.
*/
case class PackedRowCommitMessage(rows: Array[InternalRow]) extends WriterCommitMessage
/**
* A simple [[DataWriter]] that just sends all the rows it's received as a commit message.
*/
class PackedRowDataWriter() extends DataWriter[InternalRow] with Logging {
private val data = mutable.Buffer[InternalRow]()
// Spark reuses the same `InternalRow` instance, here we copy it before buffer it.
override def write(row: InternalRow): Unit = data.append(row.copy())
override def commit(): PackedRowCommitMessage = {
PackedRowCommitMessage(data.toArray)
}
override def abort(): Unit = {}
override def close(): Unit = {
data.clear()
}
}
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