sp26-cs544 cs544
Lecture 31: Cassandra Replication Lecture 31: Cassandra Replication
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Overview
Learning Objectives
Replication
Walking the Ring for Replicas
Failure Domains
Replication Policies
Quorum Reads and Writes
Acks and What “Committed” Means
Cassandra Writes
Cassandra Reads
Optimizing Reads with Checksums
When R + W > RF
Tuning R and W
Conflict Resolution
How Conflicts Arise
Two Approaches to Resolving Conflicts
Timestamps and Last-Writer-Wins
Conclusion
Source