The Fusioninsight HD cluster planned by a bank has 90 nodes. If 3 control nodes are planned, how many data nodes in the cluster is recommended to plan?

Hive does not support a timeout retry mechanism.

What storage formats does Hive support in the Fusioninsight HD system include? (Multiple choice)

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 seriously affects performance.

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