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/*
* 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
import java.util.{LinkedHashMap => JLinkedHashMap}
import java.util.Map.Entry
import scala.collection.mutable
import org.json4s.NoTypeHints
import org.json4s.jackson.Serialization
import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.execution.streaming.FileStreamSource.FileEntry
import org.apache.spark.sql.internal.SQLConf
class FileStreamSourceLog(
metadataLogVersion: String,
sparkSession: SparkSession,
path: String)
extends CompactibleFileStreamLog[FileEntry](metadataLogVersion, sparkSession, path) {
import CompactibleFileStreamLog._
// Configurations about metadata compaction
protected override val compactInterval =
sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_COMPACT_INTERVAL)
require(compactInterval > 0,
s"Please set ${SQLConf.FILE_SOURCE_LOG_COMPACT_INTERVAL.key} (was $compactInterval) to a " +
s"positive value.")
protected override val fileCleanupDelayMs =
sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_CLEANUP_DELAY)
protected override val isDeletingExpiredLog =
sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_DELETION)
private implicit val formats = Serialization.formats(NoTypeHints)
// A fixed size log entry cache to cache the file entries belong to the compaction batch. It is
// used to avoid scanning the compacted log file to retrieve it's own batch data.
private val cacheSize = compactInterval
private val fileEntryCache = new JLinkedHashMap[Long, Array[FileEntry]] {
override def removeEldestEntry(eldest: Entry[Long, Array[FileEntry]]): Boolean = {
size() > cacheSize
}
}
protected override def serializeData(data: FileEntry): String = {
Serialization.write(data)
}
protected override def deserializeData(encodedString: String): FileEntry = {
Serialization.read[FileEntry](encodedString)
}
def compactLogs(logs: Seq[FileEntry]): Seq[FileEntry] = {
logs
}
override def add(batchId: Long, logs: Array[FileEntry]): Boolean = {
if (super.add(batchId, logs)) {
if (isCompactionBatch(batchId, compactInterval)) {
fileEntryCache.put(batchId, logs)
}
true
} else {
false
}
}
override def get(startId: Option[Long], endId: Option[Long]): Array[(Long, Array[FileEntry])] = {
val startBatchId = startId.getOrElse(0L)
val endBatchId = getLatest().map(_._1).getOrElse(0L)
val (existedBatches, removedBatches) = (startBatchId to endBatchId).map { id =>
if (isCompactionBatch(id, compactInterval) && fileEntryCache.containsKey(id)) {
(id, Some(fileEntryCache.get(id)))
} else {
val logs = super.get(id).map(_.filter(_.batchId == id))
(id, logs)
}
}.partition(_._2.isDefined)
// The below code may only be happened when original metadata log file has been removed, so we
// have to get the batch from latest compacted log file. This is quite time-consuming and may
// not be happened in the current FileStreamSource code path, since we only fetch the
// latest metadata log file.
val searchKeys = removedBatches.map(_._1)
val retrievedBatches = if (searchKeys.nonEmpty) {
logWarning(s"Get batches from removed files, this is unexpected in the current code path!!!")
val latestBatchId = getLatest().map(_._1).getOrElse(-1L)
if (latestBatchId < 0) {
Map.empty[Long, Option[Array[FileEntry]]]
} else {
val latestCompactedBatchId = getAllValidBatches(latestBatchId, compactInterval)(0)
val allLogs = new mutable.HashMap[Long, mutable.ArrayBuffer[FileEntry]]
super.get(latestCompactedBatchId).foreach { entries =>
entries.foreach { e =>
allLogs.put(e.batchId, allLogs.getOrElse(e.batchId, mutable.ArrayBuffer()) += e)
}
}
searchKeys.map(id => id -> allLogs.get(id).map(_.toArray)).filter(_._2.isDefined).toMap
}
} else {
Map.empty[Long, Option[Array[FileEntry]]]
}
(existedBatches ++ retrievedBatches).map(i => i._1 -> i._2.get).toArray.sortBy(_._1)
}
}
object FileStreamSourceLog {
val VERSION = "v1"
}
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