Github user jerryshao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13513#discussion_r79530152
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSourceLog.scala
 ---
    @@ -0,0 +1,132 @@
    +/*
    + * 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) && isCompactionBatch(batchId, 
compactInterval)) {
    --- End diff --
    
    yes, you're right, I will fix it.


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