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The Path Towards Simplifying Consistency in Distributed Systems
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Caitie McCaffrey
April 24, 2017
Technology
1
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The Path Towards Simplifying Consistency in Distributed Systems
Caitie McCaffrey
April 24, 2017
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Transcript
The Path Towards Simplifying Consistency in Distributed Systems
Caitie McCaffrey Distributed Systems Engineer caitiem.com @caitie
Distributed Systems Engineer Feral Concurrency Control Programmer Caitie McCaffrey
2015
2015 “Application-level Mechanisms for maintaining database integrity”
Halo 4 Statistics Service Halo 4 Statistics Service Record &
Aggregate Statistics From Every Multiplayer Halo Game a User Plays
Halo 4 Statistics Service
Observability at Twitter Make Dashboards & Alerts Always Available
Cmd Line Tool Viz / Dashboad Alerting Svc Cuckoo-Read Cuckoo-Write
Indexing Svc Relay Svc Twitter Front End Twitter Svc Twitter Statsite Twitter Svc Twitter Svc Scribe Collection Agent HDFS Manhattan Database Public Cloud Observability at Twitter
Notify Users When We Receive Abuse Reports
Notify Users If An Action is Taken
Report Events Stream Modification Events Stream Enrollment Events Stream Listener
Service Daemons Service Executor Service Notification Events Stream Notification Service Manhattan Macaw
Feral Concurrency Control
Service Service Service Monoliths
The Rise of NoSQL
None
Microservices
State of Affairs
Linearizable Sequential Causal Pipelined Random Access Memory Read Your Write
Monotonic Read Monotonic Write Write From Read Consistency Models
None
None
None
None
None
None
Can We Do Better?
Finance & Accounting
VisiCalc 1979
1983 Lotus 123
None
1987 Excel
None
& Standardization Computer Aided Computation
Standardization for Consistency in Distributed Systems
1988
1988 “We believe the form of communication that is needed
is remote procedure call with at- most-once semantics”
1988 “An adequate language must provide a modular, reasonably automatic
method for achieving consistency ”
Branch B Account 789: $250 Branch A Account 123 :
$100 Account 456: $50 SubAction: Deposit (123, 50) Transfer Action SubAction: Withdraw(789, 50) Transfer Deposit Withdraw enter topaction coenter action branchA.Deposit(123, 50) action branchB.Withdraw(789, 50) end end
What about Spanner?
2015
2015 “The biggest barrier…is that consistency mechanisms must integrate across
many stateful services”
Microservices
CRDTs * Stolen from Chris Meiklejohn in practice
CRDTs * Stolen from Chris Meiklejohn in practice
There Is No One Size Fits All Consistency Model
Mixed Consistency Data Stores Manhattan
None
Computer Aided Computation for Consistency in Distributed Systems
2016
Bank Application Bank Account must be > 0 Deposit Money
Withdrawal Money
‘Cause I’m Strong Enough: Reasoning About Consistency Choices in Distributed
Systems
Define Invariants & Actions Deposit Money Withdrawal Money Determine Consistency
Required Bank Account > 0 Eventual Consistency Strong Consistency Code Generation?
& Standardization Computer Aided Computation
Thank you @caitie