Which of the following causesHDFSofNameNodeEntersafemode(safe read-only mode)?
(multiple choice)

• A.Active and standbyNameNodeof metadata is running out of disk space.
• B.The number of missing blocks exceeds the threshold.
• C.Lost replicas exceed the threshold.
• D.The corrupted copy exceeds the threshold.

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HDFSSupport large file storage, support for multiple users to write operations to the same file at the same time, and can be modified anywhere in the file.

• A.False
• B.True

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FusionInsight HDin, aboutOozieWhich of the following descriptions is correct? (multiple choice)

• A.killCommands can act onPREP/SUSPEND/RUNNINGstatus job
• B.submitcommand to change the status of the job toPREP
• C.startcommand allowsPREPThe status of the job changes toRUNNING
• D.runcommand to change the job status toRUNNING

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in aMapReduceapplication,mapThe output of the function is viaMapReduce? ?After processing, send toreduceletter number. This process belongs to? ?Sort and group pairs.

• A.False
• B.True

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FusionInsight HDmiddle,OoziesupportHDFS Action.

• A.False
• B.True

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