spark FilePartitionReader 源码
spark FilePartitionReader 代码
文件路径:/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FilePartitionReader.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.datasources.v2
import java.io.{FileNotFoundException, IOException}
import scala.util.control.NonFatal
import org.apache.spark.SparkUpgradeException
import org.apache.spark.internal.Logging
import org.apache.spark.rdd.InputFileBlockHolder
import org.apache.spark.sql.catalyst.FileSourceOptions
import org.apache.spark.sql.connector.read.PartitionReader
import org.apache.spark.sql.errors.QueryExecutionErrors
import org.apache.spark.sql.execution.datasources.SchemaColumnConvertNotSupportedException
class FilePartitionReader[T](
readers: Iterator[PartitionedFileReader[T]],
options: FileSourceOptions)
extends PartitionReader[T] with Logging {
private var currentReader: PartitionedFileReader[T] = null
private def ignoreMissingFiles = options.ignoreMissingFiles
private def ignoreCorruptFiles = options.ignoreCorruptFiles
override def next(): Boolean = {
if (currentReader == null) {
if (readers.hasNext) {
try {
currentReader = getNextReader()
} catch {
case e: FileNotFoundException if ignoreMissingFiles =>
logWarning(s"Skipped missing file.", e)
currentReader = null
// Throw FileNotFoundException even if `ignoreCorruptFiles` is true
case e: FileNotFoundException if !ignoreMissingFiles =>
throw QueryExecutionErrors.fileNotFoundError(e)
case e @ (_: RuntimeException | _: IOException) if ignoreCorruptFiles =>
logWarning(
s"Skipped the rest of the content in the corrupted file.", e)
currentReader = null
}
} else {
return false
}
}
// In PartitionReader.next(), the current reader proceeds to next record.
// It might throw RuntimeException/IOException and Spark should handle these exceptions.
val hasNext = try {
currentReader != null && currentReader.next()
} catch {
case e: SchemaColumnConvertNotSupportedException =>
throw QueryExecutionErrors.unsupportedSchemaColumnConvertError(
currentReader.file.filePath, e.getColumn, e.getLogicalType, e.getPhysicalType, e)
case e @ (_: RuntimeException | _: IOException) if ignoreCorruptFiles =>
logWarning(
s"Skipped the rest of the content in the corrupted file: $currentReader", e)
false
case sue: SparkUpgradeException => throw sue
case NonFatal(e) =>
e.getCause match {
case sue: SparkUpgradeException => throw sue
case _ => throw QueryExecutionErrors.cannotReadFilesError(e, currentReader.file.filePath)
}
}
if (hasNext) {
true
} else {
close()
currentReader = null
next()
}
}
override def get(): T = currentReader.get()
override def close(): Unit = {
if (currentReader != null) {
currentReader.close()
}
InputFileBlockHolder.unset()
}
private def getNextReader(): PartitionedFileReader[T] = {
val reader = readers.next()
logInfo(s"Reading file $reader")
// Sets InputFileBlockHolder for the file block's information
val file = reader.file
InputFileBlockHolder.set(file.filePath, file.start, file.length)
reader
}
}
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