Regarding the difference and connection between Spark SQL & Hive, which of the following statements is correct? (Multiple choice)

What is the index name of ElasticSearch?

When the Client of HDFS writes a file, the writing position of the first copy of the data is determined by the NameNode, and the writing position of other copies is determined by the Data Node.

Hive is a data warehouse infrastructure built on Hadoop. It provides a set of tools that can be used to extract, transform and load (ETL), which is a mechanism for storing, querying and analyzing large- scale data stored in Hadoop.

In the Mapreduce process, by default, a fragment is a block and a mapTask.