Github user fsauer65 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22560#discussion_r220748131
--- Diff:
examples/src/main/scala/org/apache/spark/examples/jdbc/PluggableConnectionFactoryExample.scala
---
@@ -0,0 +1,76 @@
+/*
+ * 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.examples.jdbc
+
+import java.sql.Connection
+
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.execution.datasources.jdbc._
+
+object RDS {
+ def balancedUrl: String = "TBD"
+}
+
+/*
+In real life the above would be something like the below but I did not
want to introduce a
+dependency on AWS-RDS:
+
+object RDS extends Logging {
+ lazy val config: Config =
ConfigFactory.load(s"typesafe_configfile").getConfig("myconfig")
+
+ lazy val clusterId = config.getString("rds.cluster")
+
+ lazy val rds = AmazonRDSClientBuilder.defaultClient() // requires
AWS_REGION environment variable
+ // as well as AWS
credentials
+
+ private var endpoints: Seq[String] = null
+
+ def balancedUrl: String = this.synchronized {
+ // initialize or rotate list of endpoints
+ endpoints = if (endpoints == null) {
+ rds.describeDBInstances().getDBInstances.asScala
+ .filter(i => i.getDBClusterIdentifier == clusterId &&
i.getDBInstanceStatus == "available")
+ .map(instance =>
s"${instance.getEndpoint.getAddress}:${instance.getEndpoint.getPort}")
+ } else endpoints.drop(1) ++ endpoints.take(1)
+ endpoints.mkString(s"jdbc:postgresql://",",","/dbname")
+ }
+}
+*/
+
+class RDSLoadBalancingConnectionFactory extends ConnectionFactoryProvider {
+ override def createConnectionFactory(options: JDBCOptions): () =>
Connection =
+ () => LoadDriver(options).connect(RDS.balancedUrl,
options.asConnectionProperties)
+}
+
+object PluggableConnectionFactoryExample {
--- End diff --
added unit tests
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