upcoming changes to UDFs

[Zheng Shao <zs...@gmail.com>]

Hi,

https://issues.apache.org/jira/browse/HIVE-266

As part of HIVE-266, we are looking for changing UDF signature to use
Writable instead of Java Primitive Classes. Some preliminary tests showed
that this gives us 20%+ performance improvements on the wall time of a
mapper.

We will try to make it backward compatible so that existing UDFs written by
our users can still work. But if users are looking for better performance,
then changing UDFs to use Writable classes will give you a boost.

Please watch the progress on HIVE-266 if you are interested.

Also, please reply this thread to give us some information about what UDFs
you have written and their signature. That can help us make sure that the
upcoming changes do not disturb your existing code.


-- 
Yours,
Zheng