Set this to accurate to help using scratch directories immediately on blob storage techniques (it may result in performance penalties).
Quantity of entries included towards the GROUP BY aggregation hash right before a recomputation of typical entry size is executed.
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This configuration house allows the consumer to offer a comma-divided listing of URLs which provide the type and location of Hadoop credential vendors.
In the absence of table/partition statistics, common row dimension is going to be used to estimate the number of rows/data sizing.
If turned on, splits produced by ORC will involve metadata in regards to the stripes within the file. This knowledge is read remotely (from the consumer or HiveServer2 device) and despatched to all the duties.
In addition to the configuration Qualities outlined in this portion, some HiveServer2 Houses are shown in other sections:
By default, the cache that ORC enter format utilizes to retail store the ORC file footer works by using tough references for the cached object. Location this to real can help keep away from out-of-memory concerns less than memory force (in some cases) check it out at the price of slight unpredictability in General question efficiency.
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Ascertain the volume of map endeavor at most Employed in the abide by up map sign up for job for any skew be a part of by specifying the bare minimum split dimension. It should be employed together with hive.skewjoin.mapjoin.map.jobs to complete a high-quality grained Command.
The default quantity of minimize tasks for every career. Commonly set to a primary close to the volume of readily available hosts. Dismissed when mapred.
The Hive/Tez optimizer estimates the information sizing flowing by way of Every with the operators. Within the absence of primary statistics like number of rows and knowledge sizing, file measurement is utilized to estimate the number of rows and info dimensions.
Regardless of whether Hive permits the optimization about converting prevalent join into mapjoin based upon the enter file dimension. If this parameter is on, as well as sum of dimension for n-1 of your tables/partitions home for an n-way join is more compact than the scale specified by hive.
The support principal to the metastore thrift server. The Distinctive string _HOST will get replaced quickly with the proper host title.