FUNDAMENTALS OF COMPUTER

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DATABASE FUNDAMENTALS

BASICS OF BIG DATA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In Cassandra, ____ is used to specify data centers and the number of replicas to place within each data center. It attempts to place replicas on distinct racks to avoid the node failure and to ensure data availability.
A
Simple strategy
B
Network topology strategy
C
Quorum strategy
D
None of the mentioned
Explanation: 

Detailed explanation-1: -Network strategy is used to specify data centers and the number of replicas to place within each data center. It attempts to place replicas on distinct racks to avoid the node failure and to ensure data availability.

Detailed explanation-2: -Two replication strategies are available: SimpleStrategy : Use only for a single datacenter and one rack. If you ever intend more than one datacenter, use the NetworkTopologyStrategy .

Detailed explanation-3: -Generally you should set the replication strategy greater than one, but no more than the number of nodes in the cluster. Cassandra stores copies (replicas) of data on multiple nodes to ensure reliability and fault tolerance. A replication strategy determines which nodes to place replicas on.

Detailed explanation-4: -Cassandra stores data replicas on multiple nodes to ensure reliability and fault tolerance. The replication strategy for each Edge keyspace determines the nodes where replicas are placed. The total number of replicas for a keyspace across a Cassandra cluster is referred to as the keyspace’s replication factor.

Detailed explanation-5: -The consistency level QUORUM means 51% or a majority of replica nodes across all datacenters responds.

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