The maximum memory to be used for hash in RS operator for best K assortment. The default worth "-one" means no Restrict.
Listing of supported blobstore strategies that Hive makes use of to use Unique browse/publish efficiency improvements.
LDAP link URL(s), value could possibly be a SPACE divided list of URLs to several LDAP servers for resiliency. URLs are tried out from the buy specified until finally the relationship is prosperous.
Regardless of whether Hive ought to periodically update activity progress counters during execution. Enabling This permits activity development to generally be monitored more carefully in The task tracker, but may well impose a general performance penalty.
Aside from the configuration Houses outlined With this portion, some HiveServer2 Qualities are detailed in other sections:
The key distinction between this paramater and hive.optimize.skewjoin is this parameter takes advantage of the skew information saved inside the metastore to optimize the prepare at compile time itself. If there is no skew facts while in the metadata, this parameter will never have any effect.
Allows HiveServer2 to deliver progress bar update info. This can be currently available only if the execution motor is tez.
By default Tez will request however many CPUs MapReduce is configured to use for every container. This can be utilized to overwrite the default.
The utmost information size with the dimension table that generates partition pruning information. If reaches this Restrict, the optimization will likely be turned off.
Moreover the configuration Homes detailed Within this section, some Attributes in other sections also are relevant to Spark:
Some choose queries could be converted to an individual FETCH activity, minimizing latency. Currently the question really should be single sourced not getting click here now any subquery and may not have any aggregations or distincts (which incur RS – ReduceSinkOperator, necessitating a MapReduce activity), lateral sights and joins.
Title of the atmosphere variable that retains the special script operator ID during her comment is here the person's completely transform purpose (the custom mapper/reducer that the person has laid out in the question).
A number utilized to proportion sampling. By modifying this quantity, person will alter the subsets of information sampled.
No matter whether to enable Log4j2's asynchronous logging. Asynchronous logging can provide sizeable efficiency advancement as logging will be dealt with in a very different thread that makes use of the LMAX disruptor queue for buffering log messages.