By default, the cache that ORC enter format employs to keep the ORC file footer makes use of difficult references for the cached item. Setting this to legitimate can help avoid out-of-memory issues less than memory force (in some instances) at the cost of slight unpredictability in General question efficiency.
Irrespective of whether a MapJoin hashtable must deserialize values on need. Based upon how many values in the desk the join will really touch, it may help save a lot of memory by not making objects for rows that are not essential. If all rows are wanted, definitely there is not any get.
Creates vital schema with a startup if just one will not exist. Reset this to Phony, following making it as soon as.
Specifies a totally qualified domain consumer to employ when binding to LDAP for authentication, as an alternative to utilizing the person itself. This allows for situations where by all customers do not have look for permissions on LDAP, instead requiring only the bind user to own research permissions.
Highest number of rows permitted for just a more compact subset of knowledge for simple LIMIT, if it is a fetch query. Insert queries are certainly not restricted by this limit.
This amount usually means simply how much memory the nearby endeavor usually takes to carry The true secret/benefit into an in-memory hash desk when this map join is followed by a bunch by.
What number of compactor employee threads to operate on this metastore instance. Set this into a favourable quantity on a number of situations with the Thrift metastore company as Portion of turning on Hive transactions. For a complete list of parameters essential for turning on transactions, see hive.txn.supervisor.
The amount of rows with the exact same important value should be cached in memory per sort-merge-bucket joined desk.
Thrift won't assist nulls in maps, so any nulls present in maps retrieved from object-relational mapping (ORM) needs to be both pruned or transformed to empty strings.
Whilst mr stays the default motor for historical motives, it can be alone a historic engine and is also deprecated from the Hive two line (HIVE-12300). It may be taken off without the need of even further warning.
Greatest number of retries when stats publisher/aggregator received an exception updating intermediate database. Default is not any tries on failures.
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Turn on Tez' vehicle reducer parallelism attribute. When enabled, Hive will nonetheless estimate details measurements and established parallelism estimates. Tez will sample supply vertices' output dimensions and change the estimates at runtime as essential.
Enable capturing compiler read entity of transform URI which can be introspected in the semantic and exec hooks.