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PACELC conceptacronym

Extends CAP.

Extends CAP. CAP only addresses behavior during partitions; PACELC adds the steady-state choice between Latency and Consistency: "if Partitioned, A or C; Else, L or C." Better captures the engineering reality that consistency choices are often per-operation: a system might be CP under partitions but prefer L over C in normal operation (low latency, eventual consistency).

see also

• cap-theorem
• eventual-consistency
• linearizability

topics: distributed-systems, cap

references:

• Daniel Abadi — PACELC