I found this Cloudera example helpful: http://grepcode.com/file/repository.cloudera.com/content/repositories/releases/org.apache.hadoop.hive/hive-contrib/0.7.0-cdh3u0/org/apache/hadoop/hive/contrib/udaf/example/UDAFExampleMaxMinNUtil.java#UDAFExampleMaxMinNUtil.Evaluator
igor decide.com On Mon, Jul 29, 2013 at 4:32 PM, Ritesh Agrawal <ragra...@netflix.com>wrote: > Hi Robin, > > Thanks for the suggestion. I did find such an example in Hadoop The > definitive guide book. However I am not total confused. > > The book extends UDAF instead of AbstractGenericUDAFResolver. Which one is > recommended ? > > Also the example in the book uses DoubleWritable as a return type for the > "terminate" function. However, I will be returning an arraylist of double. > Do I always need to written objects that are derived from > WritableComponents. > > Ritesh > On Jul 29, 2013, at 4:15 PM, Robin Morris wrote: > > > I believe a map will be passed correctly from the terminatePartial to the > > merge functions. But it seems a bit of overkill. > > > > Why not define a class within your UDAF which has 4 public data members, > > and return instances of that class from terminatePartial()? > > > > Robin > > > > > > On 7/29/13 3:19 PM, "Ritesh Agrawal" <ragra...@netflix.com> wrote: > > > >> Hi all, > >> > >> I am writing my first UDAF. In my terminatePartial() function, I need to > >> store different data having different data types. Below is a list of > >> items that I need to store > >> 1. C1 : list of doubles > >> 2. C2: list of doubles > >> 3. C3: double > >> 4. Show: list of strings > >> > >> > >> I am wondering can I use simple HashMap and store these different > objects > >> into it. Will it automatically serialize or will I need to write my own > >> serializiable method. Also is there any example of a UDAF that shows how > >> to use map type structure for storing partial results. > >> > >> Thanks > >> > >> Ritesh > > > >
