existSpark, which of the following statements about broadcast variables is correct?

• A.broadcast variable in everyTasksave a copy
• B.Broadcast variables are read-only
• C.broadcast variable viaSparkContext.broadcast() method to generate
• D.broadcast variable in eachExecutorsave a copy

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

• A.Divide the input data into one by one. and split this further into pairs, then asmapfunction input of
• B.put allmapThe results of the stages are merged to get the final result
• C.mergemapThe result of the stage has the samekeyvalue key-value pair
• D.rightmapThe results of the stages are sorted and merged

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existFusionInsight HDofHBase, which of the following scenarios will not triggerFlushoperate?

• A.RegionofMemStoreset over threshold
• B.RegionServerTotal memory exceeds threshold
• C.When the client initiates a scan request, it willscan cachingset too large
• D.Initiate by client-specified methodFlushdo

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FusionInsight HDsystematicV100R002C60version,HiveOnly supports based onMapReduceEngine query service, not supported based onSparkEngine query service.

• A.True
• B.False

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KafkaIt is a distributed message publishing and subscribing system. It only forwards messages and does not guarantee save message.

• A.True
• B.False

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