vanzin commented on a change in pull request #26416: [SPARK-29779][CORE] Compact old event log files and cleanup URL: https://github.com/apache/spark/pull/26416#discussion_r355772612
########## File path: core/src/main/scala/org/apache/spark/deploy/history/EventFilter.scala ########## @@ -0,0 +1,226 @@ +/* + * 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.deploy.history + +import java.util.ServiceLoader + +import scala.collection.JavaConverters._ +import scala.io.{Codec, Source} +import scala.util.control.NonFatal + +import org.apache.hadoop.fs.{FileSystem, Path} +import org.json4s.jackson.JsonMethods.parse + +import org.apache.spark.internal.Logging +import org.apache.spark.scheduler._ +import org.apache.spark.util.{JsonProtocol, Utils} + +/** + * EventFilterBuilder provides the interface to gather the information from events being received + * by [[SparkListenerInterface]], and create a new [[EventFilter]] instance which leverages + * information gathered to decide whether the event should be filtered or not. + */ +private[spark] trait EventFilterBuilder extends SparkListenerInterface { + def createFilter(): EventFilter +} + +object EventFilterBuilder { + /** + * Loads all available EventFilterBuilders in classloader via ServiceLoader, and initializes + * them via replaying events in given files. + */ + def initializeBuilders(fs: FileSystem, files: Seq[Path]): Seq[EventFilterBuilder] = { + val bus = new ReplayListenerBus() + + val builders = ServiceLoader.load(classOf[EventFilterBuilder], + Utils.getContextOrSparkClassLoader).asScala.toSeq + builders.foreach(bus.addListener) + + files.foreach { log => + Utils.tryWithResource(EventLogFileReader.openEventLog(log, fs)) { in => + bus.replay(in, log.getName) + } + } + + builders + } +} + +/** + * [[EventFilter]] decides whether the given event should be filtered in, or filtered out when + * compacting event log files. + * + * The meaning of return values of each filterXXX method are following: + * - Some(true): Filter in this event. + * - Some(false): Filter out this event. + * - None: Don't mind about this event. No problem even other filters decide to filter out. + * + * Please refer [[FilteredEventLogFileRewriter]] for more details on how the filter will be used. + */ +private[spark] trait EventFilter { Review comment: > Do you suggest me to use lift to deal with Option in caller side, or do some composing? I see you implemented something with partial functions, so I'll comment there once I get through the code instead of replying here. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
