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Regardless of whether to improve multi group by query to make only one M/R occupation program. If the multi group by query has common group by keys, it will be optimized to create only one M/R task.
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When making an attempt a lesser subset of data for simple LIMIT, how much dimension we want to ensure Each and every row to obtain at least.
Signifies whether replication dump ought to involve details about ACID tables. It ought to be applied together with hive.
Decide the number of map undertaking used in the follow up map join work for a skew join. It ought to be applied together with hive.skewjoin.mapjoin.min.break up to conduct a fine grained Handle.
The utmost memory for use by map-aspect group aggregation hash desk. In the event the memory utilization is bigger than this range, pressure to flush data.
Whether or not to execute Positions in parallel. Relates to MapReduce Work that could run in parallel, for instance Employment processing diverse source tables right before a be part of. As of Hive 0.fourteen, also applies to move responsibilities which will run in parallel, such as relocating data files to insert targets through multi-insert.
The most memory to be used by map-facet group aggregation hash desk. If your memory use is greater than this amount, power to flush knowledge.
The default partition identify in the event that the dynamic partition column benefit is null/vacant string or almost every other values that cannot be escaped.
The default amount of reduce duties for every task. Usually set to a major close to the quantity of accessible hosts. Overlooked when mapred.
If enabled dictionary Examine will come about immediately after to start with row index stride (default 10000 rows) else dictionary check will occur prior to producing 1st stripe. In both of those instances, the choice to employ dictionary or not will be retained thereafter.
Keytab file for SPNEGO principal, optional. A normal worth would seem view publisher site like /and many others/stability/keytabs/spnego.
Determines the amount of compaction data in point out 'didn't initiate' might be retained in compaction history for the specified desk/partition.