Which of the following components must depend on Zookeeper to run? (Multiple choice)

• A.YARN
• B.HDFS
• C.HBase
• D.Spark

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Huawei Fusioninsight HD is the first domestic big data platform that complies with national financial and other garbage protection. Which of the following aspects is its security now?

• A.Authorization
• B.Data Security
• C.All of the above are correct
• D.System Security

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F1ume is used to collect data, and the basic unit of data transmitted by the device is

• A.Block
• B.Split
• C.Packet
• D.Event

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In the HDFS copy placement strategy, what is the distance between different servers in the same rack?

• A.4
• B.3
• C.2
• D.1

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The following figure shows the configuration of HDFS tiered storage. If the number of copies of the block is 4, which of the following statement is wrong?

• A.If it is the other copy fails to read except the first copy, try to write to the storage type specified in "Alternative Storage Policy for Copy"
• B.All 4 blocks will be written to RAM_DISK
• C.The first copy of the block will be written into RAM_DISK, and the remaining copies will be written into DISK
• D.If the first copy of the block fails to write to RAM_DISK, try to write to the storage type specified by the "alternative storage strategy"

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