Which statement is correct about the client uploading files to the HDF$ file system in the Hadoop system?

The file data of the client is passed to the DataNode through the NameNode
Allows the client to divide the file into multiple blocks, according to DaThe address information of taNodel is entered into each DataNode in order
The client writes the entire file to each DataNodel in sequence according to the address information of the DataNode, and then divides the file into multiple blos by the DataNode)ck
The client only uploads data to one DataNode, and then the NameNodet is responsible for block replication

Answer(s): B

Which of the descriptions of ordinary tables and external tables in Hive is incorrect?

Create a normal table by default
The essence of the external table is to associate the file path that already exists on HDFS with the table
When deleting a normal table, both metadata and data are deleted at the same time
When deleting an external table, only the external table data is deleted without the metadata

Answer(s): D

Which of the following statements about Flink barriers is wrong

Barriers are periodically inserted into the data flow and flow with it as part of the data flow
Barriers are at the heart of Flink snapshots
A barrier separates the snapshot data of the current cycle from the snapshot data of the next cycle
When the barrier is inserted, it will temporarily block the data flow

Answer(s): D

Fusioninsight Manager's statement about the configuration function of the service is incorrect?

Service level configuration can take effect for all instances
Instance-level configuration takes effect only for this instance
Instance-level configuration also takes effect on other instances
After the configuration is saved, you need to restart the service to take effect

Answer(s): C

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