About RDDs. Which of the following statements is false?

• A.RDD is Spark's abstraction of underlying data
• B.RDDs have a lineage mechanism (Lineed)
• C.RDD is a read-only, partitionable distributed dataset
• D.RDDs are stored on disk by default

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The processing logic of topology is in bolt.

• A.True
• B.False

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When a certainRegion EerverAfter the failure,HWasterWhich of the following options must be followed to recover old data?

• A.HLog
• B.Ragion
• C.RowEay
• D.HDFS

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To reduce the amount of data written to disk, mapreduce supports compressing MOF (mapoutfile) before writing.

• A.True
• B.False

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Through the unified user management system in the big data platform, unified management of users, roles and organizations of various open-source component application systems in the platform can be realized, and cross-domain single sign-on logout and unified identity authentication function among various application systems can be realized.

• A.True
• B.False

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