Redis uses the exist command to determine whether a key exists.

• A.True
• B.False

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Which of the following scenarios in HBase will trigger the F1ush operation?

• A.When the number of files in WALs reaches a threshold
• B.The ratio of the total memory occupied by the MemStore to the total memory of the RegionServer exceeds the preset threshold size
• C.HBasePeriod refreshMemstore, silentthink period is 1Hour
• D.The total size of the MemStore in the Region has reached the preset Flush Size threshold

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There are two ways to clean up Kafka logs: delete and compact. The default value is delete.

• A.True
• B.False

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Which of the following are the actual application scenarios of Kafka

• A.Aggregate statistical system operation data
• B.Site activity tracking
• C.log collection
• D.Resource management

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What are the functions of Nimbus in the Streaming architecture?

• A.task scheduling
• B.Monitor task execution status
• C.start/stop worker process
• D.Resource allocation

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