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Posted to user@hive.apache.org by Vaibhav Jain <va...@gmail.com> on 2014/02/11 00:23:43 UTC
Which side (map/reduce) does a UDF/UDTF/UDAF execute
Hi,
I need to know what are conditions based on which Hive decides to execute
a UDF, UDTF and UDAF on the map or reduce side. So far I have understood
that UDFs are mostly executed on map side and
UDAFs on reduce side. But are there any conditions in which a UDF can be
executed on reduce side and UDAF on map side. I haven't found any info for
UDTFs. It would be great if you could provide an explanation for each of
theses or point me to the hive source code files where I should look for
the answers.
--
Thanks
Vaibhav Jain