Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19383#discussion_r145467615
--- 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 {
+
+ private var sparkVersion = SPARK_VERSION
+ private var appInfo: v1.ApplicationInfo = null
+ private var coresPerTask: Int = 1
+
+ // Keep track of live entities, so that task metrics can be efficiently
updated (without
+ // causing too many writes to the underlying store, and other expensive
operations).
--- End diff --
When we update metrics to disk?
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