Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/22207#discussion_r212526373
--- Diff:
external/kafka-0-10-sql/src/test/scala/org/apache/spark/sql/kafka010/KafkaDontFailOnDataLossSuite.scala
---
@@ -0,0 +1,281 @@
+/*
+ * 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 scala.collection.mutable
+import scala.util.Random
+
+import org.scalatest.time.SpanSugar._
+
+import org.apache.spark.SparkContext
+import org.apache.spark.sql.{DataFrame, Dataset, ForeachWriter}
+import org.apache.spark.sql.streaming.{StreamTest, Trigger}
+import org.apache.spark.sql.test.{SharedSQLContext, TestSparkSession}
+
+/**
+ * This is a basic test trait which will set up a Kafka cluster that keeps
only several records in
+ * a topic and ages out records very quickly. This is a helper trait to
test
+ * "failonDataLoss=false" case with missing offsets.
+ *
+ * Note: there is a hard-code 30 seconds delay
(kafka.log.LogManager.InitialTaskDelayMs) to clean up
+ * records. Hence each class extending this trait needs to wait at least
30 seconds (or even longer
+ * when running on a slow Jenkins machine) before records start to be
removed. To make sure a test
+ * does see missing offsets, you can check the earliest offset in
`eventually` and make sure it's
+ * not 0 rather than sleeping a hard-code duration.
+ */
+trait KafkaMissingOffsetsTest extends SharedSQLContext {
+
+ protected var testUtils: KafkaTestUtils = _
+
+ override def createSparkSession(): TestSparkSession = {
+ // Set maxRetries to 3 to handle NPE from `poll` when deleting a topic
+ new TestSparkSession(new SparkContext("local[2,3]",
"test-sql-context", sparkConf))
+ }
+
+ override def beforeAll(): Unit = {
+ super.beforeAll()
+ testUtils = new KafkaTestUtils {
+ override def brokerConfiguration: Properties = {
+ val props = super.brokerConfiguration
+ // Try to make Kafka clean up messages as fast as possible.
However, there is a hard-code
+ // 30 seconds delay (kafka.log.LogManager.InitialTaskDelayMs) so
this test should run at
+ // least 30 seconds.
+ props.put("log.cleaner.backoff.ms", "100")
+ // The size of RecordBatch V2 increases to support transactional
write.
+ props.put("log.segment.bytes", "70")
+ props.put("log.retention.bytes", "40")
+ props.put("log.retention.check.interval.ms", "100")
+ props.put("delete.retention.ms", "10")
+ props.put("log.flush.scheduler.interval.ms", "10")
+ props
+ }
+ }
+ testUtils.setup()
+ }
+
+ override def afterAll(): Unit = {
+ if (testUtils != null) {
+ testUtils.teardown()
+ testUtils = null
+ }
+ super.afterAll()
+ }
+}
+
+class KafkaDontFailOnDataLossSuite extends KafkaMissingOffsetsTest {
+
+ import testImplicits._
+
+ private val topicId = new AtomicInteger(0)
+
+ private def newTopic(): String =
s"failOnDataLoss-${topicId.getAndIncrement()}"
+
+ /**
+ * @param testStreamingQuery whether to test a streaming query or a
batch query.
+ * @param writeToTable the function to write the specified [[DataFrame]]
to the given table.
+ */
+ private def verifyMissingOffsetsDontCauseDuplicatedRecords(
+ testStreamingQuery: Boolean)(writeToTable: (DataFrame, String) =>
Unit): Unit = {
+ val topic = newTopic()
+ testUtils.createTopic(topic, partitions = 1)
+ testUtils.sendMessages(topic, (0 until 50).map(_.toString).toArray)
+
+ eventually(timeout(60.seconds)) {
+ assert(
+ testUtils.getEarliestOffsets(Set(topic)).head._2 > 0,
+ "Kafka didn't delete records after 1 minute")
+ }
+
+ val table = "DontFailOnDataLoss"
+ withTable(table) {
+ val df = if (testStreamingQuery) {
+ spark.readStream
+ .format("kafka")
+ .option("kafka.bootstrap.servers", testUtils.brokerAddress)
+ .option("kafka.metadata.max.age.ms", "1")
+ .option("subscribe", topic)
+ .option("startingOffsets", s"""{"$topic":{"0":0}}""")
+ .option("failOnDataLoss", "false")
+ .option("kafkaConsumer.pollTimeoutMs", "1000")
+ .load()
+ } else {
+ spark.read
+ .format("kafka")
+ .option("kafka.bootstrap.servers", testUtils.brokerAddress)
+ .option("kafka.metadata.max.age.ms", "1")
+ .option("subscribe", topic)
+ .option("startingOffsets", s"""{"$topic":{"0":0}}""")
+ .option("failOnDataLoss", "false")
+ .option("kafkaConsumer.pollTimeoutMs", "1000")
+ .load()
+ }
+ writeToTable(df.selectExpr("CAST(value AS STRING)"), table)
+ val result = spark.table(table).as[String].collect().toList
+ assert(result.distinct.size === result.size, s"$result contains
duplicated records")
+ // Make sure Kafka did remove some records so that this test is
valid.
+ assert(result.size > 0 && result.size < 50)
--- End diff --
How do you ensure that the above configure retention policy will not
completely delete all records?
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