Configuring Hive Parameters¶
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:
The default value is true. |
hive.default.fileformat | Indicates the default file format used by Hive. | Versions earlier than MRS 3.x: TextFile MRS 3.x or later: 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. Note This parameter applies to MRS 3.x or later. | 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. Note This parameter applies to MRS 3.x or later. | true |