spark AvroOutputWriterFactory 源码
spark AvroOutputWriterFactory 代码
文件路径：/connector/avro/src/main/scala/org/apache/spark/sql/avro/AvroOutputWriterFactory.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.avro
import org.apache.avro.Schema
import org.apache.hadoop.mapreduce.TaskAttemptContext
import org.apache.spark.sql.execution.datasources.{OutputWriter, OutputWriterFactory}
import org.apache.spark.sql.types.StructType
/**
* A factory that produces [[AvroOutputWriter]].
*
* @param catalystSchema Catalyst schema of input data.
* @param avroSchemaAsJsonString Avro schema of output result, in JSON string format.
* @param positionalFieldMatching If true, match Avro schema against catalyst schema using field
* ordering (i.e. position/index) instead of field name.
*/
private[sql] class AvroOutputWriterFactory(
catalystSchema: StructType,
avroSchemaAsJsonString: String,
positionalFieldMatching: Boolean) extends OutputWriterFactory {
private lazy val avroSchema = new Schema.Parser().parse(avroSchemaAsJsonString)
override def getFileExtension(context: TaskAttemptContext): String = ".avro"
override def newInstance(
path: String,
dataSchema: StructType,
context: TaskAttemptContext): OutputWriter = {
new AvroOutputWriter(path, context, catalystSchema, positionalFieldMatching, avroSchema)
}
}
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