System Design
PACELC
adds 'else: latency vs consistency'
Source board
This definition comes from the board below. Open it to see the term in context.
The Cut Phone LineSystem DesignMore terms from this board
- availabilityevery request gets an answer
- CAPunder partition, pick A or C
- consistency (linearizable)everyone sees the latest write, as if one copy
- partitionthe network drops messages between nodes (NOT a crash)
- tunable consistencychoose per query via quorum — R + W > N guarantees a read sees the latest write (Cassandra/Dynamo)