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From pwendell <...@git.apache.org>
Subject [GitHub] spark pull request: [WIP] [SPARK-1132] Persisting Web UI through r...
Date Tue, 04 Mar 2014 01:47:24 GMT
Github user pwendell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/42#discussion_r10239640
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/UISparkListener.scala ---
    @@ -0,0 +1,214 @@
    +/*
    + * 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.ui
    +
    +import scala.collection.mutable
    +import scala.collection.mutable.ArrayBuffer
    +
    +import org.json4s.jackson.JsonMethods._
    +
    +import org.apache.spark.scheduler._
    +import org.apache.spark.storage._
    +import org.apache.spark.util.FileLogger
    +import org.apache.spark.util.JsonProtocol
    +import org.apache.spark.SparkContext
    +
    +private[ui] trait UISparkListener extends SparkListener
    +
    +/**
    + * A SparkListener that serves as an entry point for all events posted to the UI.
    + *
    + * GatewayUISparkListener achieves two functions:
    + *
    + *  (1) If the UI is live, GatewayUISparkListener posts each event to all attached listeners
    + *      then logs it as JSON. This centralizes event logging and avoids having all attached
    + *      listeners log the events on their own.
    + *
    + *  (2) If the UI is rendered from disk, GatewayUISparkListener replays each event deserialized
    + *      from the event logs to all attached listeners.
    + */
    +private[ui] class GatewayUISparkListener(parent: SparkUI, sc: SparkContext) extends SparkListener
{
    --- End diff --
    
    I discussed with @andrewor14 offline, but the proposal was basically to refactor things
in a way that makes the components more re-usable. Basically we'll separate the three responsibilities
here into distinct classes:
    
    a) logging a stream of events to a file.
    b) creating an event bus as the result of logged events.
    c) mutliplexing several spark listeners from one.


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