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SRECon-Americas-2017: Trafficshift: Avoiding disasters at scale

LinkedIn has evolved from serving live traffic out of one data center to four data centers spread geographically. Serving live traffic from four data centers at the same time has taken us from a disaster recovery model to a disaster avoidance model where we can take an unhealthy data center out of rotation and redistribute its traffic to the healthy data centers within minutes, with virtually no visible impact to users As we transitioned from big monolithic application to micro-services, we witnessed pain in determining capacity constraints of individual services to handle extra load during disaster scenarios. Stress testing individual services using artificial load in a complex micro-services architecture wasn’t sufficient to provide enough confidence in a data center’s capacity. To solve this problem, we at LinkedIn leverage live traffic to stress services site-wide by shifting traffic to simulate a disaster load. This talk provide details on how LinkedIn uses Traffic Shifts to mitigate user impact by migrating live traffic between its data centers and stress test site-wide services for improved capacity handling and member experience.

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TrafficShift - Avoiding
Disasters at Scale
Michael Kehoe
Staff SRE
LinkedIn
Anil Mallapur
SRE
LinkedIn
Overview
LinkedIn Architectural Overview
Fabric Disaster Recovery
Questions
467+ million
members
World’s largest professional network
200+
Countries
Who are we ?
Production-SRE team at LinkedIn
● Assist in restoring stability to services
during site critical issues
● Developing applications to improve
MTTD and MTTR
● Provide direction and guidelines for site
monitoring
● Build tools for efficient site issue
troubleshooting, issue detection &
correlation
Terminologies
Fabric/Colo Data Center with full application stack deployed
PoP/Edge Entry point to LinkedIn network (TCP/ SSL
termination)
Load Test Planned stress testing of data centers
2003 2010 2011 2013 2014 2015
Active &
Passive
Active &
Active
Multi-colo 3-
way Active &
Active
Multi-colo n-
way Active &
Active
Ad

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SRECon-Americas-2017: Trafficshift: Avoiding disasters at scale