HeartSaVioR commented on a change in pull request #26258: [SPARK-29604][SQL] 
Force initialize SessionState before initializing HiveClient in SparkSQLEnv
URL: https://github.com/apache/spark/pull/26258#discussion_r339766574
 
 

 ##########
 File path: 
sql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLEnvSuite.scala
 ##########
 @@ -0,0 +1,91 @@
+/*
+ * 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.hive.thriftserver
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.launcher.SparkLauncher
+import org.apache.spark.sql.hive.HiveUtils.{HIVE_METASTORE_JARS, 
HIVE_METASTORE_VERSION}
+import org.apache.spark.sql.hive.test.TestHiveContext
+import 
org.apache.spark.sql.hive.thriftserver.__root__.test.custom.listener.{DummyQueryExecutionListener,
 DummyStreamingQueryListener}
+import org.apache.spark.sql.internal.StaticSQLConf.{QUERY_EXECUTION_LISTENERS, 
STREAMING_QUERY_LISTENERS, WAREHOUSE_PATH}
+
+class SparkSQLEnvSuite extends SparkFunSuite {
+  test("SPARK-29604 external listeners should be initialized with Spark 
classloader") {
+    withSystemProperties(
+      QUERY_EXECUTION_LISTENERS.key -> 
classOf[DummyQueryExecutionListener].getCanonicalName,
+      STREAMING_QUERY_LISTENERS.key -> 
classOf[DummyStreamingQueryListener].getCanonicalName,
+      WAREHOUSE_PATH.key -> TestHiveContext.makeWarehouseDir().toURI.getPath,
+      // The issue occured from "maven" and list of custom jars, but providing 
list of custom
+      // jars to initialize HiveClient isn't trivial, so just use "maven".
+      HIVE_METASTORE_JARS.key -> "maven",
+      HIVE_METASTORE_VERSION.key -> null,
+      SparkLauncher.SPARK_MASTER -> "local[2]",
+      "spark.app.name" -> "testApp") {
+
+      try {
+        SparkSQLEnv.init()
+      } finally {
+        SparkSQLEnv.stop()
+      }
+    }
+  }
+
+  private def withSystemProperties(pairs: (String, String)*)(f: => Unit): Unit 
= {
+    def setProperties(properties: Seq[(String, String)]): Unit = {
+      properties.foreach { case (key, value) =>
+        if (value != null) {
+          System.setProperty(key, value)
+        } else {
+          System.clearProperty(key)
+        }
+      }
+    }
+
+    val oldValues = pairs.map { kv => kv._1 -> System.getProperty(kv._1) }
+    try {
+      setProperties(pairs)
+      f
+    } finally {
+      setProperties(oldValues)
+    }
+  }
+}
+
+/**
+ * These classes in this package are intentionally placed to the outer package 
of spark,
+ * because IsolatedClientLoader leverages Spark classloader for shared 
classess including
+ * spark package, and the test should fail if Spark initializes these 
listeners with
+ * IsolatedClientLoader.
+ */
+package __root__.test.custom.listener {
 
 Review comment:
   Ah OK I thought I ran test to see whether the test fails on master, but I 
might missed that. After commenting out for change in SparkSQLEnv it still 
passes (as its package is belong to shared class)
   
   I'll create a new file reflecting it.

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