Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/21221#discussion_r207016169
--- 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
--- End diff --
Yup, on my end this is a low conviction suggestion - we might start feeling
pain around this as we add more metric types, but for a first pass this is
probably fine.
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