A large-scale production enterprise,tPlan to analyze the internal logistics data and sales datat,Assumeiout of the wayT effectganalysis, which of the following statements are correct? (multiple choice)

• A.HBaseIt can be built on ordinary commercial servers, and the construction cost is relatively low.
• B.HBaseIt can store massive data and support dynamic expansion, which can fulfill the storage requirements of logistics and sales data.
• C.HbaseIt supports efficient random reading, and can complete real-time analysis and command of the logistics situation through reasonable design.
• D.Logistics data is very sparse,HBaseCan handle sparse data efficiently.

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HDFSIn application development of , which of the following fields areHDFSInterfaces supported by the service? (multiple choice)

• A.BufferedOutputStream.write
• B.FileSystem.append
• C.BufferedOutputStream.flush
• D.FileSystem.create

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existMapReduceIn the development framework,InputFormatWhat is the function of the class?

• A.mergemapThe result of the stage has the samekeyvalue key-value pair
• B.Split the input data into individualsplit, and willsplitfurther split into<key,value>yes, then asmapletter input of numbers
• C.rightmapThe results of the stages are sorted and merged
• D.put allmapThe results of the stages are merged to get the final result

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existFlumeDuring cascaded transfers, you can usefail overmode transfer, so that if the next hop isFlumenode failure or When the data is received abnormally, it can automatically switch to another way to continue transmission.

• A.True
• B.False

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HDFSclient withNcopy toHDFSWhen writing a file, if one of the replicas fails to write, all replicas will return write failure

• A.True
• B.False

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