Hi, all How does hive decide to launch how many map tasks? I know there are some configs to help hive to decide how many reduce task to launch? But how about map tasks?
I thought that number of map tasks equals to the number of the store files. I have a table now with 2 partitions, and one has 4 files in it, the other has 2, when I execute "select count(*) from table", only one map is launched. How can I increase the number of map tasks to improve the performance? Thanks. -- Regards, Cheng Su
