When hive.optimize.limittranspose is correct, this variable specifies the minimal reduction inside the amount of tuples of your outer enter in the be a part of or input in the union that the optimizer ought to get as a way to use the rule.
To estimate the scale of information flowing by way of operators in Hive/Tez (for reducer estimation and so forth.), common row size is multiplied with the total quantity of rows coming out of each and every operator. Regular row dimension is computed from average column dimensions of all columns inside the row.
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No matter if Hive really should periodically update process progress counters all through execution. Enabling This enables undertaking development to get monitored additional closely in The work tracker, but may well impose a effectiveness penalty.
When true, this turns on dynamic partition pruning to the Spark engine, to ensure joins on partition keys will be processed by writing to A short lived HDFS file, and browse later on for eliminating pointless partitions.
When configuring the max link pool dimensions, it is usually recommended to take into account the amount of metastore circumstances and the number of HiveServer2 circumstances
To wash up the Hive scratch directory whilst beginning the Hive server (or HiveServer2). This is not an selection for a multi-person setting because it will accidentally remove the scratch Listing in use.
Irrespective of whether Hive enables the optimization about changing YOURURL.com typical be part of into mapjoin determined by the input file measurement. If this parameter is on, and also the sum of measurement for n-one on the tables/partitions for an n-way sign up for is smaller than the size specified by hive.
In addition to the configuration Houses outlined With this segment, some Houses in other sections may also be connected to Tez:
Moreover the configuration Homes shown In this particular area, click here for more some Qualities in other sections are also related to Spark:
Establishes the selection mechanism used by metastore shopper to connect to distant metastore. SEQUENTIAL indicates that the very first legitimate metastore within the URIs specified as Portion of hive.metastore.uris are going to be picked. RANDOM implies the metastore will be picked randomly.
Name from the surroundings variable that holds the distinctive script operator ID inside the user's change perform (the custom made mapper/reducer which the user has specified in the question).
Produces important schema on a startup if just one doesn't exist. Established this to false, immediately after making it the moment.
Comma divided listing of standard expression patterns for SQL point out, error code, and error information of retryable SQLExceptions, that is suitable for the Hive metastore databases.