In FusionInsight HD, when using Streaming's ACK mechanism, which of the following statements are correct? (multiple choice)

• A.After Acker is enabled, Streaming will identify the Tuple that failed to be sent and automatically resend it without human intervention.
• B.Acker will mark the processing timeout or processing failure message as fail.
• C.The application needs to implement message retransmission logic in the fail() interface method of spout.
• D.Starting from the spout, the failure of any link in the formed Tuple tree will mark the entire tree as a failure.

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In FusionInsight HD, which components provide external SQL or SQL-like capabilities? (multiple choice)

• A.HBase
• B.Spark
• C.Redis
• D.Hive

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In which of the following is the MapReduce task finally executed?

• A.container
• B.NodeManager
• C.ResourceManager
• D.AppMaster

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When creating a user through the FusionInsight manager interface, if you want the user to have read and write permissions for all topics, but do not have the permission to create topics, which group of Kafka service should be added?

• A.Kafkaadmin group
• B.Kafka group
• C.Kafkasuperuser group

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Which of the following is not a feature of MapReduce?

• A.Good scalability
• B.Easy to program
• C.Real-time calculation
• D.High fault tolerance

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