In order to improve the fault tolerance of kafka, kafka supports partition replication strategy. What is wrong with the following description of Leader partition and Follower partition?

Fusionlnsight HD cluster contains many kinds of services, and each service is composed of several roles. Which of the following are service roles? (Multiple choice)

In the Fusioninsight HD system, which component does the flume data stream not need to pass through in the node?

To reduce the amount of data written to disk, mapreduce supports MOF (mapoutfile) compression before writing.

RDD has Transformation and Action operators. Which of the following are Action operators?