aboutStreamingthe topology (Topology), which of the following descriptions is wrong?

• A.OneTopologyis made up of a group ofSpoutcomponents andBoltcomponents passStream Groupingsconnected
• B.Business logic is encapsulated inTopologymiddle OneTopologyOnly one can be specified to startWorkerprocess
• C.Directed acyclic graph (DAG)
• D.Topologywill run until it is explicitlykill

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The user wants to develop an application to accessHBaseservice, first apply for a machine accounttester1, and give it sets accessHBaseservice permissions; then download the account'skeytabfile, and use that account to run the application use. Subsequent applications of this application will increase business requirements and require access toHiveservice, then givingtester1User additionally granted access askHiveAfter the component permissions, you need to re-download the user'skeytabdocument.

• A.False
• B.True

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Spark Streamingavailable fromKafkaReceive data and perform calculations, and the calculation results can only be stored inHDFS, can't write backKafka.

• A.True
• B.False

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scountryonnsgtHDWhen developing applications with a secure version, you can usekeytabfile forKerberosinstall Fully certified.

• A.False
• B.True

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Hadoopin the systemYARNassigned toContainerThe memory size, which can be passed through the parameter yarn.app.mapreduce.am.resource.mb(yarn.nodemanager.resource.memory-mb) to set.
( )

• A.False
• B.True

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