Exact same as hive.metastore.check out.direct.sql, for read through statements within a transaction that modifies metastore knowledge. Because of non-conventional behavior in Postgres, if a direct SQL pick out query has incorrect syntax or something comparable within a transaction, the entire transaction will fail and drop-back again to DataNucleus won't be doable. You ought to disable the utilization of immediate SQL within transactions if that transpires inside your situation.
No matter whether to operate the initiator and cleaner threads on this metastore instance. Established this to accurate on one particular occasion in the Thrift metastore provider as A part of turning on Hive transactions. For an entire list of parameters expected for turning on transactions, see hive.txn.supervisor.
Amount of time the Spark Distant Driver should look ahead to a Spark position to get submitted prior to shutting down. If a Spark task isn't introduced after this period of time, the Spark Distant Driver will shutdown, Therefore releasing any methods it has been holding onto.
When striving a lesser subset of knowledge for simple Restrict, the amount of dimension we want to guarantee Every row to acquire at the very least.
Hash aggregation will probably be turned off In the event the ratio among hash table size and enter rows is larger than this range. Set to 1 to be sure hash aggregation isn't turned off.
No matter whether to enable Log4j2's asynchronous logging. Asynchronous logging can give considerable general performance advancement as logging will probably be handled within a independent thread that employs the LMAX disruptor queue for buffering log messages.
Time in milliseconds involving operates with the cleaner thread. Raising this price will lengthen time it takes to wash up old, now not utilised variations of information and lower the load to the metastore server.
Employed by LLAP daemon undertaking scheduler metrics for time visit the site taken to eliminate undertaking (as a consequence of pre-emption) and practical time squandered with the process that is certainly about to be preempted.
The utmost information dimension link for the dimension desk that generates partition pruning data. If reaches this limit, the optimization are going to be turned off.
The check interval for session/operation timeout, which may be disabled by placing to zero or negative value.
The HYBRID manner reads the footers for all data files if there are fewer files than envisioned mapper depend, switching around to building one split per file if the standard file dimensions are lesser compared to default HDFS blocksize.
A comma divided list of builtin UDFs that aren't allowed to be executed. A UDF that is A part of the list will return an mistake if invoked from a query.
Identify the volume of map activity Utilized in the abide by up map join task for just a skew join. It should be employed along with hive.skewjoin.mapjoin.min.break up to perform a wonderful grained Management.
No matter whether to enable Log4j2's asynchronous logging. Asynchronous logging can give major overall performance enhancement as logging might be taken care of inside a independent thread that works by using the LMAX disruptor queue for buffering log messages.