Number of mapper

[#1]

Hi,

Our  user is running a job and which is a hive query and  number of  mapper is always  6 and not changing even the data size change.  It is  a  insert query.   How do  I change number of mappers ?  Which parameter determine number of mappers?

[#2]

Hi,

Our  user is running a job and which is a hive query and  number of  mapper is always  6 and not changing even the data size change. 192168101.win 100001.dev routerlogin.win

It is  a  insert query.   How do  I change number of mappers ?  Which parameter determine number of mappers?

Thank you.

[#3]

hello Becky

You can either reduce "split max size" in order to gain more mappers 

SET mapreduce.input.fileinputformat.split.maxsize;

Or you can try :

Set mapreduce.job.maps=XX

for the second option, you may need to disable  map files

hive.merge.mapfiles=false

Let me know if any solution works for you 
Good luck