mapreduce - Mapper Memory and Mapper Time slow -- Optimizing hive parameters? -


i new using hive/pig not have strong understanding of how optimize query given error logs.

general scenario:

  • job running (4 hours)
  • only 2 tasks in job
  • warnings mapper memory, mapper time, , mapper speed.
  • there no joins , no reducing steps
  • default min mapper size 512 mb
  • 3 mappers working on job

does make sense me reduce min mapper size force more mappers onto job? or better increase number of mappers explicitly?

thank you!


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