The utmost memory in bytes that the cached objects can use. Memory applied is calculated determined by approximated sizing of tables and partitions from the cache. Environment it to a destructive worth disables memory estimation.
No matter whether be a part of and group by keys on tables are derived and taken care of inside the QueryPlan. This is helpful to discover how tables are accessed and to determine if they should be bucketed.
This flag should be set to legitimate to help vectorized method of your lower-side of question execution. The default value is correct.
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The Hive/Tez optimizer estimates the data sizing flowing by way of Every single of the operators. To the GROUPBY operator, to correctly compute the info size map-side parallelism ought to be recognised. By default, this price is about to 1 Because the optimizer isn't aware of the volume of mappers during compile-time.
Creates essential schema over a startup if a person does not exist. Set this to false, immediately after making it when.
Whether Hive must routinely send out development details to TaskTracker when making use of UDTF's to circumvent the process finding killed because of inactivity. People needs to be cautious due to the fact this will likely protect against TaskTracker from killing jobs with infinite loops.
Reducing this benefit will decrease the time it will take for compaction to generally be began for a desk or partition that needs compaction. On the other hand, examining if compaction is necessary involves quite a few calls for the NameNode for every desk or partition which includes had a transaction performed on it since the final important compaction. So decreasing this worth website link will raise the load within the NameNode.
This boundaries the number of partitions which might be requested through the Metastore for just a given table. A query will not be executed if it attempts to fetch much more partitions per table compared to the limit configured.
Adjustment to mapjoin hashtable size derived from desk and column statistics; the you could try this out estimate of the quantity of keys is divided by this worth. If the worth is 0, statistics aren't applied and hive.hashtable.initialCapacity is employed as an alternative.
When true the HDFS place saved while in the index file are going to be overlooked at runtime. If the information acquired moved or even the identify on the cluster acquired altered, the index data should really however be usable.
Most range of reducers that will be utilized. When the one particular specified in the configuration property mapred.cut down.jobs is destructive, Hive will use this as the maximum quantity of reducers when immediately identifying the number of reducers.
This flag should be utilised to deliver a comma divided list of entirely experienced classnames to exclude particular FileInputFormats from vectorized execution utilizing the vectorized file inputformat.
No matter if to insert into multilevel nested directories like "insert Listing '/HIVEFT25686/chinna/' from table".