slides.0426.2011.b - ACMS:TheAkamai Configuration...

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Alex Sherman (Akamai Technologies, Columbia University)  Phil Lisiecki (Akamai Technologies) Andy Berkheimer (Akamai Technologies)   Joel Wein (Akamai Technologies, Polytechnic University) ACMS: The Akamai  Configuration  Management System Author’s slides edited by Brian Cho
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ACMS The Akamai Platform Akamai operates a Content Delivery Network of  15,000+ servers distributed across 1,200+ ISPs in 60+  countries Web properties (Akamai’s customers) use these  servers to bring their web content and applications  closer to the end-users
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ACMS Problem: configuration and control Even with the widely distributed platform customers  need to maintain the control of how their content is  served Customers need to configure their service options with  the same ease and flexibility as if it was a centralized,  locally hosted system 
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ACMS Problem (cont)  Customer profiles include hundreds of  parameters. For example:  Cache TTLs Allow lists Whether cookies are accepted Whether application sessions are stored  In addition, internal Akamai services require  dynamic reconfigurations (mapping, load- balancing, provisioning services)
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ACMS Why is this difficult?  15,000 servers must synchronize to the latest  configurations within a few minutes  Some servers may be down or “partitioned-off” at  the time of reconfiguration A server that comes up after some downtime must  re-synchronize quickly Configuration may be initiated from anywhere on  the network and must reach all other servers Discussion: Many more locations (1,200+ ISPs in 60+  countries) than e.g. MapReduce, GFS Discussion: Why is this easy?
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ACMS Outline High-level overview of the functioning configuration  system Distributed protocols that guarantee fault-tolerance  (based on earlier literature) Operational experience and evaluation
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ACMS Assumptions Configuration files may vary in size from a few  hundred bytes to 100MB Submissions may originate from anywhere on  the Internet  Configuration files are submitted in their  entirety (no diffs) 
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ACMS System Requirements High availability  – system must be up 24x7 and accessible  from various points on the network  Fault-tolerant storage  of configuration files for  asynchronous delivery  Efficient delivery  – configuration files must be delivered to  the “live” edge servers quickly Recovery  – edge servers must “recover” quickly Consistency
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