Practice Test 4 | Google Cloud Certified Professional Data Engineer | Dumps | Mock Test
A social networking company has TB’s of data hosted on Cloud BigTable. This data is used by a web application that reads and writes to Bigtable. Currently, the BigTable instance is created in 1 cluster. The data analytics team of the company wants to run some batch jobs that will read the data and produce some analysis. However, it has been observed running the batch jobs alongside web application requests has slowed down things for the application users. Select the approach which will help resolve the problem.
A. Add nodes to Cloud Bigtable instance.
B. Stop the instance, add a new cluster to the instance and enable replication in-app profile. With single cluster routing batch jobs and application, traffic can be routed to different clusters.
C. Add a new cluster without stopping the instance, Cloud Bigtable will replicate the data to the new cluster. With single cluster routing batch jobs and applications, traffic can be routed to different clusters.
D. Add a new cluster without stopping the instance, Cloud Bigtable will replicate the data to the new cluster. With multi-cluster routing batch jobs and applications, traffic can be routed to different clusters.
Correct Answer – C
Option A is incorrect. In this use case batch jobs submitted will only read the data while the application will read as well as write the data. Also, application requests are latency-sensitive. Adding nodes to the cluster will not solve the issue as both batch jobs and application requests will be catered by the same instance. The more appropriate solution would be to separate the cluster for batch job and application traffic.
Option B is incorrect. For adding a cluster to an existing instance users do not have to stop the instance. BigTable provides the flexibility to add the cluster while the instance is operational.
Once the cluster is added to the instance, BigTable will start the replication and will complete in some time.
Option C is correct. The additional cluster can be added to an existing instance without any downtime. Creating an additional clusters will route the traffic from batch job and application to different clusters based on app profile. By using single cluster routing, users can route the traffic manually in case of failover.
Option D is incorrect. Multi-cluster routing automatically routes requests to the nearest cluster in an instance. If the cluster becomes unavailable, traffic automatically fails over to the nearest cluster that is available. Bigtable considers clusters in a single region to be equidistant, even though they are in different zones.
For this use case, single cluster routing is an ideal solution as you can define the cluster where the request should be diverted based on the nature of the request. Refer to GCP documentation for more details:
Comments are closed, but trackbacks and pingbacks are open.