Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16857#discussion_r101360629
--- Diff:
external/kafka-0-10-sql/src/test/scala/org/apache/spark/sql/kafka010/KafkaSourceSuite.scala
---
@@ -141,6 +142,118 @@ class KafkaSourceSuite extends KafkaSourceTest {
private val topicId = new AtomicInteger(0)
+ private def createSpark210MetadataLog(metadataPath: String):
HDFSMetadataLog[KafkaSourceOffset] =
+ {
+ new HDFSMetadataLog[KafkaSourceOffset](sqlContext.sparkSession,
metadataPath) {
+ override def serialize(metadata: KafkaSourceOffset, out:
OutputStream): Unit = {
+ val bytes = metadata.json.getBytes(UTF_8)
+ out.write(bytes.length)
+ out.write(bytes)
+ }
+
+ override def deserialize(in: InputStream): KafkaSourceOffset = {
+ val length = in.read()
+ val bytes = new Array[Byte](length)
+ in.read(bytes)
+ KafkaSourceOffset(SerializedOffset(new String(bytes, UTF_8)))
+ }
+ }
+ }
+
+ testWithUninterruptibleThread(
+ "deserialization of initial offsets compliant to new spec with Spark
2.1.0") {
+ withTempDir { metadataPath =>
+ val topic = newTopic
+ testUtils.createTopic(topic, partitions = 3)
+
+ // Write metadata using new spec
+ val provider = new KafkaSourceProvider
+ val parameters = Map(
+ "kafka.bootstrap.servers" -> testUtils.brokerAddress,
+ "subscribe" -> topic
+ )
+ val source = provider.createSource(spark.sqlContext,
metadataPath.getAbsolutePath, None,
+ "", parameters)
+ source.getOffset.get // Initialize partition offsets
+ val spark210MetadataLog =
createSpark210MetadataLog(metadataPath.getAbsolutePath)
+
+ intercept[java.lang.IllegalArgumentException] {
+ spark210MetadataLog.get(0)
+ }
+ }
+ }
+
+ testWithUninterruptibleThread("deserialization of initial offsets
written by Spark 2.1.0") {
--- End diff --
Could you use Spark 2.1.0 to generate a real file and put it in the
`external/kafka-0-10-sql/src/test/resources/` folder (there is already a file
called kafka-source-offset-version-2.1.0.txt in it)? Using a real file to write
the test so that if we change the APIs of HDFSMetadataLog and KafkaSourceOffset
in future, we can still generate the correct file format.
---
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