Hive Common Configuration Parameters

Hive is a data warehouse framework built on Hadoop. It provides the batch processing computing capability of the big data platform and can analyze and summarize structured and semi-structured data in batches to complete data computing.

This section describes common Hive parameters.

Procedure

Log in to FusionInsight Manager and choose Cluster > Services > Hive > Configurations > All Configurations.

Search for the parameter name in the search box in the upper right corner and modify the parameter value. Table 1describes common Hive parameters.

**Table 1** Hive parameter description
Parameter	Description	Default Value
hive.auto.convert.join	Whether Hive converts common join to mapjoin based on the input file size. NOTE: When Hive is used to query a join table, whatever the table size is (if the data in the join table is less than 24 MB, it is a small one), set this parameter to false. If this parameter is set to true, new mapjoin cannot be generated when you query a join table.	Possible values are as follows: true false The default value is true.
hive.default.fileformat	Indicates the default file format used by Hive.	RCFile
hive.exec.reducers.max	Indicates the maximum number of reducers in a MapReduce job submitted by Hive.	999
hive.server2.thrift.max.worker.threads	Indicates the maximum number of threads that can be started in the HiveServer internal thread pool.	1,000
hive.server2.thrift.min.worker.threads	Indicates the number of threads started during initialization in the HiveServer internal thread pool.	5
hive.hbase.delete.mode.enabled	Indicates whether to enable the function of deleting HBase records from Hive. If this function is enabled, you can use remove table xx where xxx to delete HBase records from Hive.	true
hive.metastore.server.min.threads	Indicates the number of threads started by MetaStore for processing connections. If the number of threads is more than the set value, MetaStore always maintains a number of threads that is not lower than the set value, that is, the number of resident threads in the MetaStore thread pool is always higher than the set value.	200
hive.server2.enable.doAs	Indicates whether to simulate client users during sessions between HiveServer2 and other services (such as Yarn and HDFS). If you change the configuration item from false to true, users with only the column permission lose the permissions to access corresponding tables.	true

Click Save to save the configuration.
Click Instances, select the corresponding instance, and choose More > Restart Instance for the configuration to take effect.