public static void WatermarkOffsets(string bootstrapServers, string singlePartitionTopic, string partitionedTopic)
{
LogToFile("start WatermarkOffsets");
var producerConfig = new ProducerConfig {
BootstrapServers = bootstrapServers
};
var testString = "hello world";
DeliveryReport <Null, string> dr;
using (var producer = new Producer <Null, string>(producerConfig))
using (var adminClient = new AdminClient(producer.Handle))
{
dr = producer.ProduceAsync(singlePartitionTopic, new Message <Null, string> {
Value = testString
}).Result;
Assert.Equal(0, producer.Flush(TimeSpan.FromSeconds(10))); // this isn't necessary.
var queryOffsets = adminClient.QueryWatermarkOffsets(new TopicPartition(singlePartitionTopic, 0), TimeSpan.FromSeconds(20));
Assert.NotEqual(queryOffsets.Low, Offset.Invalid);
Assert.NotEqual(queryOffsets.High, Offset.Invalid);
// TODO: can anything be said about the high watermark offset c.f. dr.Offset?
// I have seen queryOffsets.High < dr.Offset and also queryOffsets.High = dr.Offset + 1.
// The former only once (or was I in error?). request.required.acks has a default value
// of 1, so with only one broker, I assume the former should never happen.
// Console.WriteLine($"Query Offsets: [{queryOffsets.Low} {queryOffsets.High}]. DR Offset: {dr.Offset}");
Assert.True(queryOffsets.Low < queryOffsets.High);
}
var consumerConfig = new ConsumerConfig
{
GroupId = Guid.NewGuid().ToString(),
BootstrapServers = bootstrapServers,
SessionTimeoutMs = 6000
};
using (var consumer = new Consumer <byte[], byte[]>(consumerConfig))
using (var adminClient = new AdminClient(consumer.Handle))
{
consumer.Assign(new List <TopicPartitionOffset>()
{
dr.TopicPartitionOffset
});
var record = consumer.Consume(TimeSpan.FromSeconds(10));
Assert.NotNull(record.Message);
var getOffsets = adminClient.GetWatermarkOffsets(dr.TopicPartition);
Assert.Equal(getOffsets.Low, Offset.Invalid);
// the offset of the next message to be read.
Assert.Equal(getOffsets.High, dr.Offset + 1);
var queryOffsets = adminClient.QueryWatermarkOffsets(dr.TopicPartition, TimeSpan.FromSeconds(20));
Assert.NotEqual(queryOffsets.Low, Offset.Invalid);
Assert.Equal(getOffsets.High, queryOffsets.High);
}
Assert.Equal(0, Library.HandleCount);
LogToFile("end WatermarkOffsets");
}