Preview of Apache Pulsar 2.5.0
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This document provides a preview of new features in Apache Pulsar 2.5.0, including transactional streaming, sticky consumers, batch receiving, and namespace change events. It also discusses messaging semantics like at least once, at most once, and effectively once delivery. Transactional streaming allows atomic multi-topic publishes and acknowledgments. Sticky consumers improve partitioning for key-based topics. Batch receiving allows consuming messages in batches. Namespace change events provide notifications of namespace changes.
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Preview of Apache Pulsar 2.5.0
- 1. Preview of Apache Pulsar 2.5.0 Transactional streaming Sticky consumer Batch receiving Namespace change events
- 2. Messaging semantics - 1 1. At least once try { Message msg = consumer.receive() // processing consumer.acknowledge(msg) } catch (Exception e) { consumer.negativeAcknowledge(msg) } try { Message msg = consumer.receive() // processing } catch (Exception e) { log.error(“processing error”, e) } finally { consumer.acknowledge(msg) } 2. At most once 3. Exactly once ?
- 3. Messaging semantics - 2 idempotent produce and idempotent consume be used more in practice
- 4. Messaging semantics - 3 Effectively once ledgerId + messageId -> sequenceId + Broker deduplication
- 5. Messaging semantics - 4 Limitations in effectively once 1. Only works with one partition producing 2. Only works with one message producing 3. Only works with on partition consuming 4. Consumers are required to store the message id and state for restoring
- 6. Streaming processing - 1 ATopic-1 Topic-2f (A) B 1 1. Received message A from Topic-1 and do some processing
- 7. Streaming processing - 2 ATopic-1 Topic-2f (A) B 2 2. Write the result message B to Topic-2
- 8. Streaming processing - 3 ATopic-1 Topic-2f (A) B 3 3. Get send response from Topic-2 How to handle get response timeout or consumer/function crash? Ack message A = At most once Nack message A = At least once
- 9. Streaming processing - 4 ATopic-1 Topic-2f (A) B4 4. Ack message A How to handle ack failed or consumer/function crash?
- 10. Transactional streaming semantics 1. Atomic multi-topic publish and acknowledge 2.Message only dispatch to one consumer until transaction abort 3.Only committed message can be read by consumer READ_COMMITTED https://github.com/apache/pulsar/wiki/PIP-31%3A-Transaction-Support
- 11. Transactional streaming demo Message<String> message = inputConsumer.receive(); Transaction txn = client.newTransaction().withTransactionTimeout(…).build().get(); CompletableFuture<MessageId> sendFuture1 = producer1.newMessage(txn).value(“output-message-1”).sendAsync(); CompletableFuture<MessageId> sendFuture2 = producer2.newMessage(txn).value(“output-message-2”).sendAsync(); inputConsumer.acknowledgeAsync(message.getMessageId(), txn); txn.commit().get(); MessageId msgId1 = sendFuture1.get(); MessageId msgId2 = sendFuture2.get();
- 12. Sticky consumer
- 13. Sticky consumer https://github.com/apache/pulsar/wiki/PIP-34%3A-Add-new-subscribe-type-Key_shared Consumer consumer1 = client.newConsumer() .topic(“my-topic“) .subscription(“my-subscription”) .subscriptionType(SubscriptionType.Key_Shared) .keySharedPolicy(KeySharedPolicy.sticky() .ranges(Range.of(0, 32767))) ).subscribe(); Consumer consumer2 = client.newConsumer() .topic(“my-topic“) .subscription(“my-subscription”) .subscriptionType(SubscriptionType.Key_Shared) .keySharedPolicy(KeySharedPolicy.sticky() .ranges(Range.of(32768, 65535))) ).subscribe();
- 14. Batch receiving messages Consumer consumer = client.newConsumer() .topic(“my-topic“) .subscription(“my-subscription”) .batchReceivePolicy(BatchReceivePolicy.builder() .maxNumMessages(100) .maxNumBytes(2 * 1024 * 1024) .timeout(1, TimeUnit.SECONDS) ).subscribe(); Messages msgs = consumer.batchReceive(); // doing some batch operate https://github.com/apache/pulsar/wiki/PIP-38%3A-Batch-Receiving-Messages
- 15. Namespace change events https://github.com/apache/pulsar/wiki/PIP-39%3A-Namespace-Change-Events persistent://tenant/ns/__change_events class PulsarEvent { EventType eventType; ActionType actionType; TopicEvent topicEvent; }
- 17. Bo Cong / 丛搏 Pulsar Schema 智联招聘消息系统研发⼯程师 Pulsar schema、HDFS Offload 核⼼贡献者
- 18. Schema Evolution 2 Data management can't escape the evolution of schema
- 19. Single version schema 3 message 1 message 2 message 3 version 1
- 20. Multiple version schemas 4 message 1 message 2 message 3 version 1 version 2 Version 3
- 21. Schema compatibility can read Deserialization=
- 22. Compatibility strategy evolution Back Ward Back Ward Transitive version 2 version 1 version 0 version 2 version 1 version 0 can read can read can read can read can read may can’t read
- 23. Evolution of the situation 7 Class Person { @Nullable String name; } Version 1 Class Person { String name; } Class Person { @Nullable @AvroDefault(""Zhang San"") String name; } Version 2 Version 3 Can read Can readCan’t read
- 24. Compatibility check Separate schema compatibility checker for producer and consumer Producer Check if exist Consumer isAllowAutoUpdateSchema = false
- 25. Upgrade way BACKWORD Different strategy with different upgrade way BACKWORD_TRANSITIVE FORWORD FORWORD_TRANSITIVE Full Full_TRANSITIVE Consumers Producers Any order
- 26. Produce Different Message 10 Producer<V1Data> p = pulsarClient.newProducer(Schema.AVRO(V1Data.class)) .topic(topic).create(); Consumer<V2Data> c = pulsarClient.newConsumer(Schema.AVRO(V2Data.class)) .topic(topic) .subscriptionName("sub1").subscribe() p.newMessage().value(data1).send(); p.newMessage(Schema.AVRO(V2Data.class)).value(data2).send(); p.newMessage(Schema.AVRO(V1Data.class)).value(data3).send(); Message<V2Data> msg1 = c.receive(); V2Data msg1Value = msg1.getValue(); Message<V2Data> msg2 = c.receive(); Message<V2Data> msg3 = c.receive(); V2Data msg3Value = msg3.getValue();
- 27. Thanks Bo Cong
- 29. What is Apache Pulsar? Flexible Pub/Sub Messaging backed by Durable log Storage
- 30. Barrier for user? Unified Messaging Protocol Apps Build on old systems
- 31. How Pulsar handles it? Pulsar Kafka Wrapper on Kafka Java API https://pulsar.apache.org/docs/en/adaptors-kafka/ Pulsar IO Connect https://pulsar.apache.org/docs/en/io-overview/
- 32. Kafka on Pulsar (KoP)
- 33. KoP Feasibility — Log Topic
- 34. KoP Feasibility — Log Topic Producer Consumer
- 35. KoP Feasibility — Log Topic Producer Consumer Kafka
- 36. KoP Feasibility — Log Topic Producer Consumer Pulsar
- 37. KoP Feasibility — Others Producer Consumer Topic Lookup Produce Consume Offset Consumption State
- 38. KoP Overview Kafka lib Broker Pulsar Consumer Pulsar lib Load Balancer Pulsar Protocol handler Kafka Protocol handler Pulsar Producer Pulsar lib Kafka Producer Kafka lib Kafka Consumer Kafka lib Kafka Producer Managed Ledger BK Client Geo- Replicator Pulsar Topic ZooKeeper Bookie Pulsar
- 39. KoP Implementation Topic flat map: Broker sets `kafkaNamespace` Message ID and Offset: LedgerId + EntryId Message: Convert Key/value/timestamp/headers(properties) Topic Lookup: Pulsar admin topic lookup -> owner broker Produce: Convert, then call PulsarTopic.publishMessage Consume: Convert, then call non-durable-cursor.readEntries Group Coordinator: Keep in topic `public/__kafka/__offsets`
- 40. KoP Now Layered Architecture Independent Scale Instant Recovery Balance-free expand
- 41. Ordering Guaranteed ordering Multi-tenancy A single cluster can support many tenants and use cases High throughput Can reach 1.8 M messages/s in a single partition Durability Data replicated and synced to disk Geo-replication Out of box support for geographically distributed applications Unified messaging model Support both Streaming and Queuing Delivery Guarantees At least once, at most once and effectively once Low Latency Low publish latency of 5ms Highly scalable & available Can support millions of topics HA KoP Now
- 42. Demo https://kafka.apache.org/quickstart Demo1: Kafka Producer / Consumer Demo2: Kafka Connect https://archive.apache.org/dist/kafka/2.0.0/ kafka_2.12-2.0.0.tgz Demo video: https://www.bilibili.com/video/av75540685
- 43. Demo Kafka lib Broker Pulsar Consumer Pulsar lib Load Balancer Pulsar Protocol handler Kafka Protocol handler Pulsar Producer Pulsar lib Kafka Producer Kafka lib Kafka Consumer Kafka lib Kafka Producer Managed Ledger BK Client Geo- Replicator Pulsar Topic ZooKeeper Bookie Pulsar
- 44. Demo1: K-Producer -> K-Consumer Kafka lib Kafka Consumer Kafka libKafka lib Kafka Producer Broker Pulsar Protocol handler Kafka Protocol handler Pulsar Topic bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
- 46. Demo1: P-Producer -> K-Consumer Pulsar Consumer Pulsar lib Pulsar Producer Pulsar lib Kafka lib Kafka Consumer Kafka libKafka lib Kafka Producer Broker Pulsar Protocol handler Kafka Protocol handler Pulsar Topic bin/pulsar-client produce test -n 1 -m “Hello from Pulsar Producer, Message 1” bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
- 48. Demo1: P-Producer -> K-Consumer Pulsar Consumer Pulsar lib Pulsar Producer Pulsar lib Kafka lib Kafka Consumer Kafka libKafka lib Kafka Producer Broker Pulsar Protocol handler Kafka Protocol handler Pulsar Topic bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test bin/pulsar-client consume -s sub-name test -n 0
- 51. Demo2: Kafka Connect Kafka lib Kafka File Source Broker Pulsar Protocol handler Kafka Protocol handler Pulsar Topic InPut File Kafka File Sink OutPut File TOPIC bin/connect-standalone.sh config/connect-standalone.properties config/connect-file-source.properties config/connect-file-sink.properties
- 53. Demo2: Pulsar Functions Kafka lib Kafka File Source Broker Pulsar Protocol handler Kafka Protocol handler Pulsar Topic InPut File Kafka File Sink OutPut File TOPIC Kafka lib Pulsar Functions OutPut Topic bin/pulsar-admin functions localrun --name pulsarExclamation --jar pulsar-functions-api-examples.jar --classname org…ExclamationFunction --inputs connect-test-partition-0 --output out-hello
- 55. Apache Pulsar & Apache Kafka
- 57. Thanks