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

    https://github.com/apache/spark/pull/21221#discussion_r209715208
  
    --- Diff: 
core/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala ---
    @@ -0,0 +1,104 @@
    +/*
    + * 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.metrics
    +
    +import java.lang.management.{BufferPoolMXBean, ManagementFactory}
    +import javax.management.ObjectName
    +
    +import org.apache.spark.memory.MemoryManager
    +
    +/**
    + * Executor metric types for executor-level metrics stored in 
ExecutorMetrics.
    + */
    +sealed trait ExecutorMetricType {
    +  private[spark] def getMetricValue(memoryManager: MemoryManager): Long
    +  private[spark] val name = 
getClass().getName().stripSuffix("$").split("""\.""").last
    +}
    +
    +private[spark] abstract class MemoryManagerExecutorMetricType(
    +    f: MemoryManager => Long) extends ExecutorMetricType {
    +  override private[spark] def getMetricValue(memoryManager: 
MemoryManager): Long = {
    +    f(memoryManager)
    +  }
    +}
    +
    +private[spark]abstract class MBeanExecutorMetricType(mBeanName: String)
    --- End diff --
    
    Put a space after `[spark]`.


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