Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/20096#discussion_r160546593
--- Diff:
external/kafka-0-10-sql/src/test/scala/org/apache/spark/sql/kafka010/KafkaContinuousSuite.scala
---
@@ -0,0 +1,135 @@
+/*
+ * 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.kafka010
+
+import java.util.Properties
+import java.util.concurrent.atomic.AtomicInteger
+
+import org.scalatest.time.SpanSugar._
+import scala.collection.mutable
+import scala.util.Random
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.{DataFrame, Dataset, ForeachWriter, Row}
+import org.apache.spark.sql.execution.datasources.v2.DataSourceV2Relation
+import org.apache.spark.sql.execution.streaming.StreamExecution
+import
org.apache.spark.sql.execution.streaming.continuous.ContinuousExecution
+import org.apache.spark.sql.streaming.{StreamTest, Trigger}
+import org.apache.spark.sql.test.{SharedSQLContext, TestSparkSession}
+
+trait KafkaContinuousTest extends KafkaSourceTest {
+ override val defaultTrigger = Trigger.Continuous(1000)
+ override val defaultUseV2Sink = true
+
+ // We need more than the default local[2] to be able to schedule all
partitions simultaneously.
+ override protected def createSparkSession = new TestSparkSession(
+ new SparkContext(
+ "local[10]",
+ "continuous-stream-test-sql-context",
+ sparkConf.set("spark.sql.testkey", "true")))
+
+ // In addition to setting the partitions in Kafka, we have to wait until
the query has
+ // reconfigured to the new count so the test framework can hook in
properly.
+ override protected def setTopicPartitions(
+ topic: String, newCount: Int, query: StreamExecution) = {
+ testUtils.addPartitions(topic, newCount)
+ eventually(timeout(streamingTimeout)) {
+ assert(
+ query.lastExecution.logical.collectFirst {
+ case DataSourceV2Relation(_, r: KafkaContinuousReader) => r
+ }.exists(_.knownPartitions.size == newCount),
+ s"query never reconfigured to $newCount partitions")
+ }
+ }
+
+ test("ensure continuous stream is being used") {
+ val query = spark.readStream
+ .format("rate")
+ .option("numPartitions", "1")
+ .option("rowsPerSecond", "1")
+ .load()
+
+ testStream(query)(
+ Execute(q => assert(q.isInstanceOf[ContinuousExecution]))
+ )
+ }
+}
+
+class KafkaContinuousSourceSuite extends KafkaSourceSuiteBase with
KafkaContinuousTest {
--- End diff --
The `{ }` may not be needed.
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