Hadoop can run in standalone, pseudo-distributed, and fully distributed mode. Most of the time, we need to configure it to run in fully distributed mode. When the data to process is small, it is an overhead to start distributed data processing since the launch time of the fully distributed mode takes more time than the job processing time. Since v0.7.0, Hive has supported automatic conversion of a job to run in local mode with the following settings:
> SET hive.exec.mode.local.auto=true; -- default false > SET hive.exec.mode.local.auto.inputbytes.max=50000000; > SET hive.exec.mode.local.auto.input.files.max=5; -- default 4
A job must satisfy the following conditions to run in local mode:
- The total input size of the job is less ...
