The consistency level determines how many of the replicas of the data you are interacting with need to respond for the query to be considered a success.
The consistency level determines how many of the replicas of the data you are interacting with need to respond for the query to be considered a success. You need to specify the appropriate replicas in the Server property.
- ANY：At least one replica must return success in a write operation.This property guarantees that a write never fails; this consistency level delivers the lowest consistency and highest availability.
- ALL：All replicas must respond.This property provides the highest consistency and the lowest availability.
- ONE：At least one replica must respond.This is the default and suitable for most users, who do not typically require high consistency.
- TWO：At least two replicas must respond.
- THREE：At least three replicas must respond.
- QUORUM：A quorum of nodes must respond.The QUORUM properties provide high consistency with some failure tolerance.
- EACH_QUORUM：A quorum of nodes must respond where a quorum is calculated for each data center.This setting maintains consistency in each data center.
- SERIAL：A quorum of replicas performs a consensus algorithm to allow lightweight transactions.
- LOCAL_ONE：At least one replica in the local data center must respond.
- LOCAL_SERIAL：The consensus algorithm is calculated for the local data center.
- LOCAL_QUORUM：A quorum of nodes must respond where the quorum is calculated for the local data center.