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Changes to support customization of delta file names (delta-io#4)
* Parse file metadata as a separate task * change version to distinguish this branch
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Ryan Murray
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Nov 3, 2020
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115 changes: 115 additions & 0 deletions
115
src/main/scala/org/apache/spark/sql/delta/LogFileMetaParser.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * Copyright (2020) The Delta Lake Project Authors. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
|
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| package org.apache.spark.sql.delta | ||
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| import org.apache.hadoop.conf.Configuration | ||
| import org.apache.hadoop.fs.{FileStatus, Path} | ||
| import org.apache.spark.{SparkConf, SparkContext} | ||
| import org.apache.spark.internal.Logging | ||
| import org.apache.spark.sql.SparkSession | ||
| import org.apache.spark.sql.delta.storage.LogStore | ||
| import org.apache.spark.sql.delta.util.FileNames.{checkpointVersion, deltaVersion, isCheckpointFile, isChecksumFile, isDeltaFile, numCheckpointParts} | ||
| import org.apache.spark.util.Utils | ||
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| import scala.util.Try | ||
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| sealed case class DeltaFileType(value: String) | ||
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| object DeltaFileType { | ||
| object DELTA extends DeltaFileType("DELTA") | ||
| object CHECKPOINT extends DeltaFileType("CHECKPOINT") | ||
| object CHECKSUM extends DeltaFileType("CHECKSUM") | ||
| object UNKNOWN extends DeltaFileType("UNKNOWN") | ||
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| val values = Seq(DELTA, CHECKPOINT, CHECKSUM, UNKNOWN) | ||
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| def getFileType(path: Path): DeltaFileType = { | ||
| path match { | ||
| case f if isCheckpointFile(f) => DeltaFileType.CHECKPOINT | ||
| case f if isDeltaFile(f) => DeltaFileType.DELTA | ||
| case f if isChecksumFile(f) => DeltaFileType.CHECKSUM | ||
| case _ => DeltaFileType.UNKNOWN | ||
| } | ||
| } | ||
| } | ||
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| case class LogFileMeta(fileStatus: FileStatus, | ||
| version: Long, | ||
| fileType: DeltaFileType, | ||
| numParts: Option[Int]) { | ||
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| def asCheckpointInstance(): CheckpointInstance = { | ||
| CheckpointInstance(version, numParts) | ||
| } | ||
| } | ||
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| object LogFileMeta { | ||
| def isCheckpointFile(logFileMeta: LogFileMeta): Boolean = { | ||
| logFileMeta.fileType == DeltaFileType.CHECKPOINT | ||
| } | ||
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| def isDeltaFile(logFileMeta: LogFileMeta): Boolean = { | ||
| logFileMeta.fileType == DeltaFileType.DELTA | ||
| } | ||
| } | ||
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| class LogFileMetaParser(logStore: LogStore) { | ||
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| def listFilesFrom(logPath: Path): Iterator[LogFileMeta] = { | ||
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| logStore.listFrom(logPath).map(fs => { | ||
| LogFileMeta(fs, | ||
| Try(deltaVersion(fs.getPath)).getOrElse(Try(checkpointVersion(fs.getPath)).getOrElse(-1L)), | ||
| DeltaFileType.getFileType(fs.getPath), | ||
| numCheckpointParts(fs.getPath)) | ||
| }) | ||
| } | ||
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| } | ||
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| object LogFileMetaParser extends LogFileMetaProvider | ||
| with Logging { | ||
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| def apply(sc: SparkContext, logStore: LogStore): LogFileMetaParser = { | ||
| apply(sc.getConf, sc.hadoopConfiguration, logStore) | ||
| } | ||
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| def apply(sparkConf: SparkConf, | ||
| hadoopConf: Configuration, | ||
| logStore: LogStore): LogFileMetaParser = { | ||
| createLogFileMetaParser(sparkConf, hadoopConf, logStore) | ||
| } | ||
| } | ||
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| trait LogFileMetaProvider { | ||
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| def createLogFileMetaParser(spark: SparkSession, logStore: LogStore): LogFileMetaParser = { | ||
| val sc = spark.sparkContext | ||
| createLogFileMetaParser(sc.getConf, sc.hadoopConfiguration, logStore) | ||
| } | ||
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| def createLogFileMetaParser(sparkConf: SparkConf, | ||
| hadoopConf: Configuration, | ||
| logStore: LogStore): LogFileMetaParser = { | ||
| val logStoreClassName = sparkConf.get("spark.delta.logFileHandler.class", | ||
| classOf[LogFileMetaParser].getName) | ||
| val logStoreClass = Utils.classForName(logStoreClassName) | ||
| logStoreClass.getConstructor(classOf[LogStore]) | ||
| .newInstance(logStore).asInstanceOf[LogFileMetaParser] | ||
| } | ||
| } |
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