Github user tejasapatil commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskAssigner.scala 
    @@ -0,0 +1,233 @@
    + * 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
    + *
    + *
    + *
    + * 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.scheduler
    +import scala.collection.mutable.ArrayBuffer
    +import scala.collection.mutable.PriorityQueue
    +import scala.util.Random
    +import org.apache.spark.internal.{config, Logging}
    +import org.apache.spark.SparkConf
    +import org.apache.spark.util.Utils
    +/** Tracking the current state of the workers with available cores and 
assigned task list. */
    +class OfferState(val workOffer: WorkerOffer) {
    +  // The current remaining cores that can be allocated to tasks.
    +  var coresAvailable: Int = workOffer.cores
    +  // The list of tasks that are assigned to this worker.
    +  val tasks = new ArrayBuffer[TaskDescription](coresAvailable)
    + * TaskAssigner is the base class for all task assigner implementations, 
and can be
    + * extended to implement different task scheduling algorithms.
    + * Together with [[org.apache.spark.scheduler.TaskScheduler 
TaskScheduler]], TaskAssigner
    + * is used to assign tasks to workers with available cores. Internally, 
TaskScheduler, requested
    + * to perform task assignment given available workers, first sorts the 
candidate tasksets,
    + * and then for each taskset, it takes a number of rounds to request 
TaskAssigner for task
    + * assignment with different the locality restrictions until there is 
either no qualified
    --- End diff --
    nit: `different the locality restrictions` => `different locality 

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