Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/19681#discussion_r150091458 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLAppStatusStore.scala --- @@ -0,0 +1,172 @@ +/* + * 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.sql.execution.ui + +import java.lang.{Long => JLong} +import java.util.Date + +import scala.collection.JavaConverters._ +import scala.collection.mutable.ArrayBuffer + +import com.fasterxml.jackson.databind.annotation.JsonDeserialize + +import org.apache.spark.{JobExecutionStatus, SparkConf} +import org.apache.spark.scheduler.SparkListener +import org.apache.spark.status.AppStatusPlugin +import org.apache.spark.status.KVUtils.KVIndexParam +import org.apache.spark.ui.SparkUI +import org.apache.spark.util.Utils +import org.apache.spark.util.kvstore.KVStore + +/** + * Provides a view of a KVStore with methods that make it easy to query SQL-specific state. There's + * no state kept in this class, so it's ok to have multiple instances of it in an application. + */ +private[sql] class SQLAppStatusStore( + store: KVStore, + listener: Option[SQLAppStatusListener] = None) { + + def executionsList(): Seq[SQLExecutionUIData] = { + store.view(classOf[SQLExecutionUIData]).asScala.toSeq + } + + def execution(executionId: Long): Option[SQLExecutionUIData] = { + try { + Some(store.read(classOf[SQLExecutionUIData], executionId)) + } catch { + case _: NoSuchElementException => None + } + } + + def executionsCount(): Long = { + store.count(classOf[SQLExecutionUIData]) + } + + def executionMetrics(executionId: Long): Map[Long, String] = { + val exec = store.read(classOf[SQLExecutionUIData], executionId) + Option(exec.metricValues) + .orElse(listener.map(_.executionMetrics(executionId))) + .getOrElse(Map()) --- End diff -- is there a race here when the execution ends? - T1 (UI thread, calling this method): execution hasn't ended, so `exec.metricValues` is null - T2 (listener): execution ends, drops execution from `liveExecutions` - T1: `_.executionMetrics(executionId)` throws an exception because its dropped from the `liveExecutions`
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