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Lessons from the field:
Catalog of Kafka Deployments
Joseph Niemiec | Sr. Product Manager
Failure / Fault
Domains and Tolerance
3
© 2021 Cloudera, Inc. All rights reserved.
Failure/Fault Domains
Limiting the state and scope of failure
What is a Failure/Fault Domain?
A set of components that share a
single point of failure and fail in a
correlated manner
4
© 2021 Cloudera, Inc. All rights reserved.
Serial and Parallel Systems Reliability
Serial Systems
• Failure of any component results
in failure of entire system
• Adding more weakens the
system ie - 90% * 90% = 81%
– Rs= R1* R2… Rn
Parallel Systems
• One component online results in
system online
• Adding more strengthens the system
ie - 1-(1-0.90)*(1-0.90) = 99%
– Rs= 1 - (1 -R1) *(1-R2) … (1-Rn)
5
© 2021 Cloudera, Inc. All rights reserved.
Basic Topic Design Theory
Partitions
● Few as needed
● Increased open files pressure
Topic Replicas
● Parallel availability
min-insync.replicas
● Durability vs Availability
● ack=all
○ for all isr with at least the min isr available
● replica.lag.time.max.ms
○ default 30 seconds!!!
Use log.retention.bytes
● Can use together
● Protect from topics growing larger
than brokers
Log Segments need to be
eligible for retention policies
● log.segment.bytes and log.roll.ms
Kafka Deployments
7
© 2021 Cloudera, Inc. All rights reserved.
Single Node Dev Cluster
• Everything is Serial
• Failure/Fault Domain
– The Cluster
– The Broker & Zookeeper
– The Laptop
– Everything!
• Failure/Fault Tolerance
– Deploy over Multiple Servers
Kafka Cluster
1 Broker
1 Zookeeper
8
© 2021 Cloudera, Inc. All rights reserved.
Single Cluster - Single Rack w/wo colocated Zookeeper
• Some things are Serial
• Some things are Parallel
• Failure/Fault Domain
– Rack
– Brokers
• Other Notes
– Shared Log Dirs for Brokers
and Zookeeper
9
© 2021 Cloudera, Inc. All rights reserved.
Single Cluster - VMs
• Some things are Serial
• Some things are Parallel
• Failure/Fault Domain
– VM Hosts
– Replica Placement
• Replica per VM Host
• Other Notes
– Debugging Complexity
10
© 2021 Cloudera, Inc. All rights reserved.
Classic Failover - Two Clusters AcFve / Passive
• Mostly Parallel*
• Failure/Fault Domain
– Mirror Makers
– Cluster
– WAN*
– Data Center
• Other Notes
– Offsets During Failover
– WAN Bandwidth
– Mirror Maker Producer Side
11
© 2021 Cloudera, Inc. All rights reserved.
STREAMS
REPLICATION
MANAGER (SRM)
with Mirror Maker2
• Supports active-active, multi-
cluster, cross DC replication &
other scenarios
• Leverage Kafka Connect for
scalability and HA
• Replicate data and configurations
• Offset translation for easy
failover
12
© 2021 Cloudera, Inc. All rights reserved.
SRM
MONITORING
SERVICES
• SMM Cluster Replications View
provides monitoring
• SRM Service calculates replication
metrics (latency, throughput)
• REST endpoints with Swagger UI
• SMM Replication Flow Alerting
13
© 2021 Cloudera, Inc. All rights reserved.
Triple OnSite Cluster - In/Out/SysOps
• Serial Pipeline
• Parallel Systems
• Failure/Fault Domain
– Cluster
• Isolated Failures in Pipeline
• IN / Out Pipeline
– Producers / Apps / Consumers
– Datacenter
• Other Notes
– Test Configs/Apps on DevOps
– Ingress / Egress Isolation
14
© 2021 Cloudera, Inc. All rights reserved.
MulF-Geo DistribuFon and AggregaFon
• Serial Pipeline
• Parallel Systems
• Failure/Fault Domain
– Data Center
– Mirror Maker
– Cluster
• Other Notes
– Fat Network Pipe
15
© 2021 Cloudera, Inc. All rights reserved.
Dual Aggregation Active Active
• Mostly Parallel*
• Failure/Fault Domain
– Data Center
– Cluster
– Mirror Maker
– Consumers / Producers*
• Other Notes
– Active/Active
– Ingress / Egress Isolation
– Consumers on any side
16
© 2021 Cloudera, Inc. All rights reserved.
Multi-AZ/Cloud Spanning
• Parallel*
• Failure/Fault Domain
– Availability Zone
– Replica Placement*
• Other Notes
– Rack Awareness
– min-insync.replicas
Thank You!
Q&A

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Lessons from the field: Catalog of Kafka Deployments | Joseph Niemiec, Cloudera

  • 1. Lessons from the field: Catalog of Kafka Deployments Joseph Niemiec | Sr. Product Manager
  • 2. Failure / Fault Domains and Tolerance
  • 3. 3 © 2021 Cloudera, Inc. All rights reserved. Failure/Fault Domains Limiting the state and scope of failure What is a Failure/Fault Domain? A set of components that share a single point of failure and fail in a correlated manner
  • 4. 4 © 2021 Cloudera, Inc. All rights reserved. Serial and Parallel Systems Reliability Serial Systems • Failure of any component results in failure of entire system • Adding more weakens the system ie - 90% * 90% = 81% – Rs= R1* R2… Rn Parallel Systems • One component online results in system online • Adding more strengthens the system ie - 1-(1-0.90)*(1-0.90) = 99% – Rs= 1 - (1 -R1) *(1-R2) … (1-Rn)
  • 5. 5 © 2021 Cloudera, Inc. All rights reserved. Basic Topic Design Theory Partitions ● Few as needed ● Increased open files pressure Topic Replicas ● Parallel availability min-insync.replicas ● Durability vs Availability ● ack=all ○ for all isr with at least the min isr available ● replica.lag.time.max.ms ○ default 30 seconds!!! Use log.retention.bytes ● Can use together ● Protect from topics growing larger than brokers Log Segments need to be eligible for retention policies ● log.segment.bytes and log.roll.ms
  • 7. 7 © 2021 Cloudera, Inc. All rights reserved. Single Node Dev Cluster • Everything is Serial • Failure/Fault Domain – The Cluster – The Broker & Zookeeper – The Laptop – Everything! • Failure/Fault Tolerance – Deploy over Multiple Servers Kafka Cluster 1 Broker 1 Zookeeper
  • 8. 8 © 2021 Cloudera, Inc. All rights reserved. Single Cluster - Single Rack w/wo colocated Zookeeper • Some things are Serial • Some things are Parallel • Failure/Fault Domain – Rack – Brokers • Other Notes – Shared Log Dirs for Brokers and Zookeeper
  • 9. 9 © 2021 Cloudera, Inc. All rights reserved. Single Cluster - VMs • Some things are Serial • Some things are Parallel • Failure/Fault Domain – VM Hosts – Replica Placement • Replica per VM Host • Other Notes – Debugging Complexity
  • 10. 10 © 2021 Cloudera, Inc. All rights reserved. Classic Failover - Two Clusters AcFve / Passive • Mostly Parallel* • Failure/Fault Domain – Mirror Makers – Cluster – WAN* – Data Center • Other Notes – Offsets During Failover – WAN Bandwidth – Mirror Maker Producer Side
  • 11. 11 © 2021 Cloudera, Inc. All rights reserved. STREAMS REPLICATION MANAGER (SRM) with Mirror Maker2 • Supports active-active, multi- cluster, cross DC replication & other scenarios • Leverage Kafka Connect for scalability and HA • Replicate data and configurations • Offset translation for easy failover
  • 12. 12 © 2021 Cloudera, Inc. All rights reserved. SRM MONITORING SERVICES • SMM Cluster Replications View provides monitoring • SRM Service calculates replication metrics (latency, throughput) • REST endpoints with Swagger UI • SMM Replication Flow Alerting
  • 13. 13 © 2021 Cloudera, Inc. All rights reserved. Triple OnSite Cluster - In/Out/SysOps • Serial Pipeline • Parallel Systems • Failure/Fault Domain – Cluster • Isolated Failures in Pipeline • IN / Out Pipeline – Producers / Apps / Consumers – Datacenter • Other Notes – Test Configs/Apps on DevOps – Ingress / Egress Isolation
  • 14. 14 © 2021 Cloudera, Inc. All rights reserved. MulF-Geo DistribuFon and AggregaFon • Serial Pipeline • Parallel Systems • Failure/Fault Domain – Data Center – Mirror Maker – Cluster • Other Notes – Fat Network Pipe
  • 15. 15 © 2021 Cloudera, Inc. All rights reserved. Dual Aggregation Active Active • Mostly Parallel* • Failure/Fault Domain – Data Center – Cluster – Mirror Maker – Consumers / Producers* • Other Notes – Active/Active – Ingress / Egress Isolation – Consumers on any side
  • 16. 16 © 2021 Cloudera, Inc. All rights reserved. Multi-AZ/Cloud Spanning • Parallel* • Failure/Fault Domain – Availability Zone – Replica Placement* • Other Notes – Rack Awareness – min-insync.replicas