You need to launch several EC2 instances to run Cassandra. There are large distributed and replicated workloads in Cassandra and you plan to launch instances using EC2 placement groups. The traffic should be distributed evenly across several partitions and each partition should contain multiple instances. Which strategy would you use when launching the placement groups?

Answer options:

A.Cluster placement strategy.
B.Spread placement strategy.
C.Partition placement strategy.
D.Network placement strategy.

Correct Answer – C
Placement groups have the placement strategies of Cluster, Partition and Spread. With the Partition placement strategy, instances in one partition do not share the underlying hardware with other partitions. This strategy is suitable for distributed and replicated workloads such as Cassandra. For details, please refer to https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#placement-groups-limitations-partition.
Option A is incorrect. Cluster placement strategy puts instances together in an availability zone. This does not resolve the problem mentioned in the question.
Option B is incorrect. Because Spread placement strategy puts instances across different racks. It does not group instances in a partition.
Option C is CORRECT: With the Partition placement strategy, instances in a partition have their own set of racks.
Option D is incorrect: Because there is no Network placement strategy.