What tuning options and configuration parameters are supported by Hive?
Some common tuning options and configuration parameters supported by Hive include:
- Optimization options for Hive execution engine:
- mapreduce.job.reduces: specifies the number of reduce tasks.
- hive.exec.parallel: Determines the number of tasks that can be executed in parallel.
- hive.exec.dynamic.partition.mode: dynamic partition mode, used to optimize dynamic partitions.
- hive.exec.compress.output: Enables compression for the output files.
- Optimization parameters inquiry:
- Enable the index filter in Hive to optimize queries.
- Enable the Cost Based Optimizer (CBO) for Hive by setting hive.cbo.enable to true.
- hive.optimize.sort.dynamic.partition: Dynamic partition sorting optimization.
- Options for IO tuning:
- Split strategy for ORC files.
- Default stripe size for ORC files: hive.exec.orc.default.stripe.size.
- Default block size for ORC files.
- Resource management and scheduling parameters:
- hive.exec.mode.local.auto: Automatically switch to local mode based on query size.
- hive.mapred.mode: Specifies the execution mode for MapReduce tasks.
In general, based on specific circumstances, Hive can be optimized as needed to improve query performance and execution efficiency.