Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/2882#discussion_r19318155 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/util/WriteAheadLogManager.scala --- @@ -0,0 +1,224 @@ +/* + * 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.streaming.util + +import java.nio.ByteBuffer + +import scala.collection.mutable.ArrayBuffer +import scala.concurrent.{ExecutionContext, Future} + +import org.apache.hadoop.conf.Configuration +import org.apache.hadoop.fs.Path +import org.apache.hadoop.fs.permission.FsPermission +import org.apache.spark.Logging +import org.apache.spark.util.Utils +import WriteAheadLogManager._ + +/** + * This class manages write ahead log files. + * - Writes records (bytebuffers) to periodically rotating log files. + * - Recovers the log files and the reads the recovered records upon failures. + * - Cleans up old log files. + * + * Uses [[org.apache.spark.streaming.util.WriteAheadLogWriter]] to write + * and [[org.apache.spark.streaming.util.WriteAheadLogReader]] to read. + * + *@param logDirectory Directory when rotating log files will be created. + * @param hadoopConf Hadoop configuration for reading/writing log files. + * @param rollingIntervalSecs The interval in seconds with which logs will be rolled over. + * Default is one minute. + * @param maxFailures Max number of failures that is tolerated for every attempt to write to log. + * Default is three. + * @param callerName Optional name of the class who is using this manager. + * @param clock Optional clock that is used to check for rotation interval. + */ +private[streaming] class WriteAheadLogManager( + logDirectory: String, + hadoopConf: Configuration, + rollingIntervalSecs: Int = 60, + maxFailures: Int = 3, + callerName: String = "", + clock: Clock = new SystemClock + ) extends Logging { + + private val pastLogs = new ArrayBuffer[LogInfo] + private val callerNameTag = + if (callerName != null && callerName.nonEmpty) s" for $callerName" else "" --- End diff -- How could callerName be null?
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