existSpark, which of the following is trueDataFrameThe operator that takes the intersection?

• A.join (right: DataFrame, join Exprs: Column): DataFrame
• B.filter (condifionExpr: String): DataFrame
• C.intersect (other: Data Frame): Data Frame
• D.dropDuplicates (): DataFrame

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RedisofLISTData structure, suitable for which of the following scenarios? (multiple choice)

• A.Build queuing systems, such as message queues
• B.uniqOperations, such as getting the ranking value of all data in a certain period of time
• C.Simulate stack operations
• D.get latestNdata operations: for example, for a certain microblog, get the latest10comments

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existFusionInsight HDin the cluster,FlumeWhich service does not support writing collected data to the cluster?

• A.HDFS
• B.Kafka
• C.Redis
• D.HBase

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HDFSmiddleNameNodeUsed to store metadata for the file system.

• A.True
• B.False

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when carried outsolrone ofcollectionWhen designing, it is necessary to design itsschema, by configuringschema.xml file implementation pairschemadesign, below aboutschemaWhich statement is wrong?

• A.For fields that do not need to store the original value, their propertiesstoredcan be set tofalse
• B.for the samedocumentHow many values of a field of the
  multiValuedmust be set totrue
• C.SchemaSimilar to the table structure in a relational database, the structure used to define index data mainly includes three part:uniquekye,FieldandFieldType
• D.copyFieldThe following definitions can be made:<field name="cat"type="string"indexed="true" stored="true"docValues="true"multiValued="false"/>
  <field name="dog"type="string"indexed="true"stored="true"
  docValues="true"multiValued="false"/>
  <field name="text"type="text_general"indexed="true"stored="false"
  multiValued="false"/>
  <copyField source="cat"dest="text"maxChars="30000"/>
  <copyField source="dog"dest="text"maxChars="30000"/>

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