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Sasl QOP value; set it to at least one of the next values to permit increased amounts of defense for HiveServer2 conversation with consumers.

Whether to enable TCP keepalive for that metastore server. Keepalive will stop accumulation of 50 %-open connections.

No matter whether to eliminate the union and thrust the operators concerning union as well as the filesink over union. This avoids an extra scan in the output by union.

Irrespective of whether to rewrite depend distinctive into two levels, i.e., the 1st phase works by using multiple reducers With all the count distinct essential and the second stage uses an individual reducer devoid of essential.

The Hive/Tez optimizer estimates the data dimensions flowing through Just about every of the operators. For the GROUPBY operator, to properly compute the info measurement map-facet parallelism has to be recognized. By default, this price is ready to 1 For the reason that optimizer is not mindful of the number of mappers during compile-time.

To estimate the size of knowledge flowing by operators in Hive/Tez (for reducer estimation etc.), normal row sizing is multiplied with the whole variety of rows popping out of each and every operator.

This parameter decides if Hive really should add an additional map-minimize task. In the event the grouping set cardinality (four in the instance earlier mentioned) is much more than this benefit, a fresh MR position is extra under the assumption that the orginal "team by" will reduce the data dimensions.

To safeguard the cluster, this controls how many partitions could be scanned for each partitioned desk. The default benefit "-1" signifies no Restrict. The Restrict on partitions isn't going to have an affect on metadata-only queries.

If the Hive metastore should make an effort to use direct SQL queries in place of the DataNucleus for certain study paths. This will increase metastore general performance when fetching many partitions or column statistics by orders of magnitude; nevertheless, It's not guaranteed to Focus on all RDBMS-es and all variations.

The key difference between this paramater and hive.optimize.skewjoin is that this parameter uses the skew info saved in the metastore to optimize the approach at compile time alone. If there is no skew information within the metadata, this parameter is not going to have any effect.

The host address the HiveServer2 World-wide-web UI will listen on. The net UI can be utilized to accessibility the HiveServer2 configuration, neighborhood logs, and metrics. It can be utilised to check some information regarding Lively sessions and queries getting executed.

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Irrespective of whether to enhance multi team by question to create one M/R work system. In case the multi team by question has typical team by keys, It'll be optimized to deliver a single M/R career. (This configuration property was taken out in launch 0.9.0.)

This variety usually means just how much memory the regional undertaking normally takes to carry The important thing/price into an in-memory hash table when this map be a part of is followed by a group by.