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Huawei HCIA-Big Data V3.5 Sample Questions:

1. In many small file scenarios, Spark will start many tasks. When there is a Shuffle operation in the SQL logic, the number of hash buckets will be greatly increased, which will seriously affect the performance. In Fusioninsight, the () operator is usually used for small file scenarios to merge the partitions generated by the small files in the Table to reduce the number of partitions, so as to avoid generating too many hash buckets during shuffle and improve performance.

A) group by
B) coalosce
C) connection
D) join

2. In the Fusioninsight product, which of the following descriptions about the kafka topic is wrong?

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

3. Hive in Fusioninsight includes two roles, HiveServer and MetaStore.

A) False
B) True

4. In the Spark SQL table, there are often many small files (the size is much smaller than the HDFS block size). In this case, Spark will start more Tasks to process these small files. When there is a Shuffle operation in the SQL logic, It will greatly increase the number of hash buckets, which will seriously affect performance.

A) False
B) True

5. Which of the following descriptions about Hive features is wrong?

A) Flexible and convenient ETL
B) Easy to use and easy to program
C) Can directly access HDFS files and HBase
D) Only supports MapReduce computing engine

Solutions: