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Recipes for building resilient cross-DC data pipeline with Kafka
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- 1. © 2016 24/7 CUSTOMER, INC. BIG DATA BANGALORE JAN MEETUP - 24/7 CUSTOMER, INC. Recipes for building resilient cross- DC data pipeline with Kafka Sr. Engineering Manager - Big Data Platform Suneet Grover
- 2. © 2016 24/7 CUSTOMER, INC. 2 About [24]7
- 3. © 2016 24/7 CUSTOMER, INC. Today’s engagement is not driving successful moments 3 Q&A IVR
- 4. © 2016 24/7 CUSTOMER, INC. Smart Customer Engagement 4 Data-Driven Reflecting All Available Data Click here to see [24]7 in action Video available at http://player.vimeo.com/video/85280070 Predictive Real-time Decisions Omni-channel Across Digital & Voice Personalized User Experience
- 5. © 2016 24/7 CUSTOMER, INC. Intent-driven engagement Anticipate consumer intent Holistic experience across channels Delivering the right moments to Move from Channel-centric engagement Reacting to consumer behavior Disconnected, fragmented channels Too many failed experiences 5
- 6. © 2016 24/7 CUSTOMER, INC. [24]7 by the numbers 6 1.2bsmart speech calls/year 127mvirtual agent inquiries/year 30magent chats/year 341mweb visitors /month 5000+digital chat agents (#1 WW) 70+data scientists (most in industry) 100+patents 300+software engineers & designers
- 7. © 2016 24/7 CUSTOMER, INC. Agenda • Introduction to Kafka • Kafka at [24]7 • From problems to solutions • Transparency and Resiliency • Metrics Demo • Design for multiple data centers 7
- 8. © 2016 24/7 CUSTOMER, INC. 8 Introduction to Kafka
- 9. © 2016 24/7 CUSTOMER, INC. Apache Kafka • Distributed • High performance and throughput • Streaming platform, pub/sub system 9
- 10. © 2016 24/7 CUSTOMER, INC. Topic and Partitions 10
- 11. © 2016 24/7 CUSTOMER, INC. Producers Consumers 11
- 12. © 2016 24/7 CUSTOMER, INC. Kafka setup across DCs 12 Brokers Region1 Region 2 Mirrormakers Zookeepers Brokers Mirrormakers Zookeepers
- 13. © 2016 24/7 CUSTOMER, INC. 13 Kafka at [24]7
- 14. © 2016 24/7 CUSTOMER, INC. 14 Intent Prediction Data Analytics Business Intelligence
- 15. © 2016 24/7 CUSTOMER, INC. 15 From problems to solutions
- 16. © 2016 24/7 CUSTOMER, INC. Challenges with Kafka 0.8.0 • Broker partition stickiness does not allow to scale • ZK load and latencies keep increasing • Range based mirror-maker algorithm not optimal • Stale topics cannot be deleted • Controller can get into a stuck state • Conflict errors in mirror-makers • Socket leaks leading to open file descriptors 16
- 17. © 2016 24/7 CUSTOMER, INC. Learnings from Kafka 0.8.0 • If the controller gets into a stuck state, delete the “/controller” node from zookeeper • Always do clean shutdown and restart of brokers • Some issues are not always visible as errors or warnings • Run ZK on SSD 17
- 18. © 2016 24/7 CUSTOMER, INC. Kafka 0.10 18 • Very stable release • Easy to do in-place from 0.8.2 onwards • Better client APIs • Richer admin operations
- 19. © 2016 24/7 CUSTOMER, INC. Broker configurations that worked for us 19 • default.replication.factor = 3 • num.partitions = 2 • delete.topic.enable = true • auto.leader.rebalance.enable = true • controlled.shutdown.enable = true • queued.max.requests = 1000
- 20. © 2016 24/7 CUSTOMER, INC.© 2016 24/7 CUSTOMER, INC. 20 Transparency and Resiliency
- 21. © 2016 24/7 CUSTOMER, INC. Metrics flow 21 Grafana Graphite Kafka Broker Metrics Reporter Kafka MM JMXTrans Zookeeper Host level Metrics & Alerts Lag monitor ELK
- 22. © 2016 24/7 CUSTOMER, INC. Essential Broker Metrics • Disk, CPU and throughput utilization • Ingress, egress volume per broker and topic • Active controller count • Offline partitions • Under replicated partitions • Partitions per broker • Log flush rate 22
- 23. © 2016 24/7 CUSTOMER, INC. Basic Alerts 23 • Disk, CPU utilization • Open file handles • Controller count • Controller re-elections • Under replicated partitions • Offline partitions • Stuck pending commands in zookeeper • Conflicts in mirror-makers
- 24. © 2016 24/7 CUSTOMER, INC. JMXTrans 24 • Push mirror-maker metrics to graphite • Throughput per topic, per thread, per instance etc. • WaitOnTake, WaitOnPut • Push zookeeper metrics to graphite • Latency, quorum, connections etc.
- 25. © 2016 24/7 CUSTOMER, INC. Data Lag Monitoring 25 • Measures the event level time delay • Monitors data latencies per cluster, per topic, per partition • Latencies between multiple steps in Kafka pipeline • Optimize and configure sampling ratio • Supports multiple message formats json, avro etc. • Alerts based on pre-defined thresholds
- 26. © 2016 24/7 CUSTOMER, INC. Indicative Broker Metrics • Request Metrics • Local Time • Remote Time • Queue Time • Request Handler Idle Percent • Network Processor Idle Percent 26
- 27. © 2016 24/7 CUSTOMER, INC. 27 Now some demo
- 28. © 2016 24/7 CUSTOMER, INC.© 2016 24/7 CUSTOMER, INC. 28 Design for Multiple Data Centers
- 29. © 2016 24/7 CUSTOMER, INC. Range Based Mirror Makers 1000 181 14 5 1 10 100 1000 Consumer 1 Consumer 2 Consumer 3 Consumer 4 Skewed Partition Assignment Num Partitions 29
- 30. © 2016 24/7 CUSTOMER, INC. Round Robin Mirror Makers 0 50 100 150 200 250 300 350 Consumer 1 Consumer 2 Consumer 3 Consumer 4 Uniform Partition Assignment Num Partitions 30
- 31. © 2016 24/7 CUSTOMER, INC. Mirror-maker fine tuning • Round Robin works better than Range based in most cases • Spread out the topics in multiple MM consumer groups • If you have a few large volume topics • Negative regex works with whitelist parameter • Doesn’t help to have too many MM consumer threads • Tune socket buffer size (doesn’t apply unless OS allows) • MM - socket.receive.buffer.bytes = 1048576 • Broker - socket.send.buffer.bytes = 1048576 31
- 32. © 2016 24/7 CUSTOMER, INC. 32 We are hiring!!! For current open positions, please log onto our careers web page http://www.247-inc.com/ Company>Careers>Location For further details, Please reach out to: Achappa C B - achappa.cb@247-inc.com, M: +91-7338458247
- 33. © 2016 24/7 CUSTOMER, INC. 33
Notes de l'éditeur
- Intro to yourself Credit to the team
- Click and let this do the slow build. The key points are: Consumers find it frustrating to cross channels (web, phone, IVR, etc.) because their content is not preserved. So they have to do things like authenticate (user ID, password) multiple times in the same interaction. These types of experiences turn potential Brand Advocates into Detractors who will move to other brands.
- This a KEY slide. Emphasize that today’s leading-edge companies – those that consumers love to engage with and have strong brands – are moving to Intent Driven Engagement
- Would like viewers read the slide. Then focus on bottom row: 300+ software engineers and designers Most data scientists in the industry 100+ patents point made earlier We are the #1 provider of digital chat agents in the world.
- Other features which we haven’t tried Security, Streams etc.