Hands-on Workshop: Apache Pulsar
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Matteo Merli and Sijie Guo from Streamlio gave a hands-on workshop on Apache Pulsar. #fast #durable #pubsub #messaging system. A low latency alternative to #kafka.
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Hands-on Workshop: Apache Pulsar
- 1. Matteo Merli & Sijie Guo fast, durable, flexible pub/sub messaging
- 2. Overview
- 3. What is Apache Pulsar? 3 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 Topic & Queue semantic in a single model Delivery Guarantees At least once, at most once and effectively once Low Latency Low publish latency of 5ms at 99pct Highly scalable Can support millions of topics
- 4. Usage of Pulsar • In production for 3+ years at Yahoo • Powering critical products like: • Yahoo Mail, Yahoo Finance, Gemini Ads, Flickr and Sherpa (NoSQL database) • 80+ tenants • 2.3 Million topics • 100 B messages / day • Full-mesh replication in 8 data-centers 4
- 5. Why build a new system? • No existing solution to satisfy requirements • Multi tenant — 1M topics — Low latency — Durability — Geo replication • Kafka doesn’t scale well with many topics: • Storage model based on individual directory per topic partition • Enabling durability kills the performance • Many other choking points: getting stats, access to metadata, flow-control • Operations are not very convenient • eg: replacing a server, manual commands to copy the data and involves clients • clients access to ZK clusters not desirable • Ability to manage large backlogs • No scalable support to keep consumer position 5
- 6. Architecture view Separate layers between brokers bookies • Broker and bookies can be added independently • Traffic can be shifted very quickly across brokers • New bookies will ramp up on traffic quickly 6 Pulsar Broker 1 Pulsar Broker 1 Pulsar Broker 1 Bookie 1 Bookie 2 Bookie 3 Bookie 4 Bookie 5 Apache BookKeeper Apache Pulsar Producer Consumer
- 7. Apache BookKeeper • A replicated log storage • Low-latency durable writes • Simple repeatable read consistency • Highly available • Store many logs per node • I/O Isolation 7
- 8. Kafka vs. Pulsar Segment Distribution
- 9. BookKeeper - Storage • A single bookie can serve and store thousands of ledgers • Write and read paths are separated: • Avoid read activity to impact write latency • Writes are added to in- memory write-cache and committed to journal • Write cache is flushed in background to separated device • Entries are sorted to allow for mostly sequential reads 9
- 10. Concepts
- 11. Pulsar Concepts Support both topic and queue semantics in a unified topic concept 11
- 15. Pulsar client library • Java — C++ — Python — WebSocket APIs • Partitioned topics • Apache Kafka compatibility wrapper API • Transparent batching of messages • Compression • TLS encryption and authentication • End-to-end encryption 15
- 16. Demo time 16
- 17. Demo time 17
- 18. Demo time 18
- 19. Lunch Break
- 20. Use cases - Message Queue • Decouple online / background • Provide high-availability • Reliable data transport 20 Online events Pulsar topic 1 Worker 1 Worker 2 Worker 3 Pulsar topic 2 Low latency publish Long running task Notification
- 21. Use cases - Message Queue • Async processing of time intensive background tasks • Publishes and complete HTTP request • Examples: Image / Video transcoding, bulk operations (large folder deletions) 21
- 22. Use cases - Message Queue 22 • Delegate the processing to multiple compute jobs which interact with micro-services • Wait until the response is pushed back to the HTTP server • Examples: breaking monolithic applications into micro-services
- 23. Use cases - Notifications • Change data capture • Listeners are frequently different tenants • Quotas needs to ensure producer is not affected 23 Event Pulsar topic Component 1 Component 2 Component 3 Listeners
- 24. Use cases - Notifications • Replicating DB transactions across regions • Notification to multiple interested tenants (example: new user account, …) 24
- 25. Use cases - Feedback system • Coordinate a large number of machines • Propagate state 25 External inputs Pulsar topic 1 Serving system Serving system Serving system Pulsar topic 2 Controller Updates Feedback
- 26. Multi Tenancy
- 27. Multi-Tenancy • Authentication / Authorization / Namespaces / Admin APIs • I/O Isolations between writes and reads • Provided by BookKeeper - Ensure readers draining backlog won’t affect publishers • Soft isolation • Storage quotas — flow-control — back-pressure — rate limiting • Hardware isolation • Constrain some tenants on a subset of brokers or bookies 27
- 28. Demo time 28
- 29. Geo-Replication
- 30. Geo-Replication • Scalable asynchronous replication • Integrated in the broker message flow • Simple configuration to add/remove regions 30 Topic (T1) Topic (T1) Topic (T1) Subscrip@on (S1) Subscrip@on (S1) Producer (P1) Consumer (C1) Producer (P3) Producer (P2) Consumer (C2) Data Center A Data Center B Data Center C
- 32. Pulsar — Conclusion • A fast durable, distributed pub/sub messaging • Flexible Traditional Messaging: Queuing and Pub/Sub • Focus on message dispatch and consumption • Remove data as soon as possible if they are not needed • It is backed by a scalable log store • durable message store, zero data loss • allow rewinding / reprocessing messages for backfill, bootstrap systems and stream computing • It carries all the fantastic features from the log store. 32
- 34. Curious to Learn More? • Apache Pulsar : http://pulsar.incubator.apache.org • Apache DistributedLog : http://bookkeeper.apache.org/ distributedlog • Apache BookKeeper : http://bookkeeper.apache.org • Follow Us @apache_pulsar @asfbookkeeper @distributedlog 34
- 35. Curious to Learn More? • Messaging, Storage, or Both: https://streaml.io/blog/ messaging-storage-or-both/ • Why BookKeeper: Consistency, Durability and Availability: https://streaml.io/blog/why-apache-bookkeeper/ • Introduction to Apache Pulsar: https://streaml.io/blog/intro- to-pulsar/ • Kafka vs DistributedLog: https://bookkeeper.apache.org/ distributedlog/technical-review/2016/09/19/kafka-vs- distributedlog.html 35
- 36. Curious to learn more about Streamlio? • Streamlio: https://streaml.io • Sandbox Preview: https://streaml.io/docs/getting-started • Learn slack channel: https://learn-streamlio.slack.com 36