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

    https://github.com/apache/spark/pull/19383#discussion_r145489589
  
    --- Diff: 
core/src/main/scala/org/apache/spark/status/AppStatusListener.scala ---
    @@ -0,0 +1,534 @@
    +/*
    + * 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.status
    +
    +import java.util.Date
    +
    +import scala.collection.mutable.HashMap
    +
    +import org.apache.spark._
    +import org.apache.spark.executor.TaskMetrics
    +import org.apache.spark.internal.Logging
    +import org.apache.spark.scheduler._
    +import org.apache.spark.status.api.v1
    +import org.apache.spark.storage._
    +import org.apache.spark.ui.SparkUI
    +import org.apache.spark.util.kvstore.KVStore
    +
    +/**
    + * A Spark listener that writes application information to a data store. 
The types written to the
    + * store are defined in the `storeTypes.scala` file and are based on the 
public REST API.
    + */
    +private class AppStatusListener(kvstore: KVStore) extends SparkListener 
with Logging {
    --- End diff --
    
    https://github.com/vanzin/spark/pull/43


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