In combination with the Hive metastore Qualities stated On this portion, some Qualities are outlined in other sections:
Maximum number of data files Hive employs to complete sequential HDFS copies between directories. Dispersed copies (distcp) will likely be made use of alternatively for larger numbers of information making sure that copies can be done quicker.
This flag must be established to real to limit utilization of indigenous vector map be a part of hash tables towards the MultiKey in queries making use of MapJoin.
No matter whether Hive need to periodically update job development counters during execution. Enabling This enables task progress to be monitored more intently in The work tracker, but may perhaps impose a general performance penalty.
The DefaultHiveMetastoreAuthorizationProvider implements the standard Hive grant/revoke model. A storage-based authorization implementation is also provided to implement as the worth of this configuration property:
If That is established to accurate, mapjoin optimization in Hive/Spark will use resource file sizes associated with the TableScan operator on the basis of your operator tree, rather than employing operator statistics.
No matter whether column accesses are tracked in the QueryPlan. This is useful to identify how tables are accessed and to ascertain if you can find squandered columns that may be trimmed.
The privileges quickly granted to the operator When a desk gets developed. An instance like "choose,drop" will grant choose and fall privilege into the proprietor on the table. Be aware that the default provides the creator of a table no usage of the desk.
Sets the quantity of lower tasks for each Spark shuffle stage (e.g. the quantity of partitions when accomplishing a Spark shuffle). This is often established to -1 by default (disabled); as a substitute the volume my site of decrease tasks is dynamically calculated depending on Hive data statistics. Location this to a continuing value sets a similar variety of partitions for all Spark shuffle levels.
The support principal for your metastore thrift server. The special string _HOST will be replaced routinely with the right host name.
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The Hive/Tez optimizer estimates the information measurement flowing via Just about every from the operators. During the absence of simple statistics like range of rows and info sizing, file dimension is utilized to estimate the number of rows and data size.
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String employed as a prefix when vehicle making column alias. By default the prefix label are going to be appended that has a column position selection to sort the column alias. Automobile technology would take place if an mixture function is Utilized in a select clause devoid of an explicit alias.