What is the physical storage unit of Region in HBase?

"Group by" in Hive refers to dividing each data set into several small data sets through certain rules, and then grouping data for several small data sets.

Regarding the the configuration function of Fusioninsight Manager to service, which of the following is incorrect?

The open source big data platform based on Hadoop mainly provides distributed computing and storage capabilities for data. Which of the following are distributed storage components? (Multiple choice)

Fusioninsight HD cluster contains a variety of services, and each service is composed of several roles. Which of the following are service roles? (Multiple choice)