Fusioninsight tool is a set of health detection tools provided for technical support engineers and maintenance engineers. It can check the health status of cluster-related nodes and services, discover potential problems in the cluster in advance, and generate health check reports. It is convenient for technical support engineers and maintenance engineers to quickly understand the health status of the system.

• A.True
• B.False

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Which of the following statement about the segment file in Kafka Logs is correct? (Multiple choice)

• A.Sparse storage, that is, the original complete data, only select multiple data at intervals for storage
• B.The index file is stored sparsely, which can greatly reduce the space occupied by the index file metadata
• C.Messages can be quickly located by indexing information
• D.All index metadata is mapped to memory, which can avoid the index data IO disk operation of sementfile

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HUAWEI CLOUD MapReduce service provides tenants fully controllable-station enterprise-level big data cluster cloud service, fully compatible with open-source interfaces, combined with HUAWEI cloud computing, storage advantages and big data industry experience, to provide customers with high performance, low cost, Flexible and easy-to-use full-stack big data platform, easy to run Hadoop, Spark, HBase. Kafka, Storm and other big data components. Realize real-time and offline analysis and mining, and discover new business opportunities.

• A.True
• B.False

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About RDDs. Which of the following statements is false?

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

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Which of the following descriptions about HBase secondary indexes is correct?

• A.The secondary index associates the column to be searched with the rowkey into an index table
• B.The secondary index was queried 2 times
• C.All of the above are correct
• D.Now it is listed as the new rowkey, and the original rowkey becomes the value

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