The index data of ElasticSearch can only be stored in the HDFS system.

• A.True
• B.False

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In Fusioninsight products, about Kafka Topic, which of the following descriptions are incorrect?

• A.Every message published to Kafka has a category, which is called Topic, which can also be understood as a queue for storing messages.
• B.The number of Topic partitions can be configured at the time of creation
• C.The storage level of each Partition corresponds to a log file, which records all information and data
• D.Each topic can only be divided into one partition

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If HDFS is deployed with a single name node, what limitations may exist? (multiple choice)

• A.Failure of this unique name node will render the entire cluster unavailable
• B.The number of objects (files, blocks) that a name node can hold is limited by the size of the memory space
• C.The amount of leaf swallowing of the entire distributed file system is limited by the throughput of a single name node
• D.It will affect the functional implementation of the upper-level components based on HDFS

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Regarding the the configuration function of Fusioninsight Manager to service, which of the following is incorrect?

• A.After the configuration is saved, the service needs to be restarted to take effect
• B.Instance-level configuration only takes effect for this instance
• C.Instance-level configuration is also effective for other instances
• D.Service-level configuration can take effect for all instances

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

• A.True
• B.False

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