How is the main master of HBaseM elected?

• A.Adjudication through Zookeeper
• B.HMaster is a dual-master mode, no adjudication is required
• C.Random selection
• D.Ruling by RegionServer

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The HDFS data reading process includes the following steps, please choose the correct order. (Drag picture title, sort question)

• A.The location where the data block corresponding to this file in NameNodel is obtained by calling NameNode remotely through RPC
• B.If the end of the data block has been reached. Then close the connection with this DataNodel, and then re-find E. a data block. until all data is read.
• C.After obtaining this input stream, the client calls the read method to read the data. The input stream selects the nearest DataNode to establish a connection and read data.
• D.The client calls the open method of the FileSystem instance to obtain the input stream corresponding to the file.
• E.The client calls close. to close the input stream.

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In the Fusioninsight HD system, it fails to view the topology or submit the topology using the Shelle command of the Streaming client. Which of the following positioning methods are correct?

• A.View Worker running log
• B.Check the Supervisori running log to determine whether the Supervisor is abnormal
• C.Check the running log of the main Nimbus to determine whether the Nimbus server is abnormal
• D.Check the client's exception stack to determine whether the client is using problems

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TaskSlot in Flink is mainly used for resource isolation, including memory resources and CPU resources.

• A.True
• B.False

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In the Fusioninsight HD system, using the Streaming client Shell command to view the topology or submit the topology fails, which of the following positioning methods are correct? (Multiple choice)

• A.Check the client exception stack to determine whether there is a problem with the client
• B.Check the running log of the main Nimbus to determine whether the Nimbus server is abnormal
• C.Check the Supervisor running log to determine whether the Supervisor is abnormal
• D.Check Worker running log

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