A.6

B.3

C.5

D.4

A.Updates sent by the client are applied in the order in which they were sent.

B.A message must be received by more than half of the servers. It will be successfully written to disk

C.The number of Zookeeper nodes must be an odd number.

D.Message update can only succeed or fail, there is no intermediate state.

A.True

B.False

A.Kafka

B.File

C.HDFS

D.Memory

A.ZKFC (ZKFailoverController) is used as a client of Zookeeper cluster to monitor the status information of NameNode

B.The ZKFC of HDFS NameNode connects to Zookeeper, and saves information such as the host name in Zookeeper

C.The ZKFC process needs to be deployed in the NameNode node and Zookeeper's Leader node

D.The Standby NameNode perceives the status of the Active NameNode through Zookeeper. Once the Active NameNode goes down, the Standby NameNode will perform the master promotion operation