> -----Original Message----- > From: Jonathan Coveney [mailto:[email protected]] > Sent: Wednesday, June 27, 2012 3:12 AM > To: [email protected] > Subject: Re: Passing a BAG to Pig UDF constructor? > > You can also just pass the bag to the UDF, and have a lazy initializer > in exec that loads the bag into memory.
Can you elaborate what you mean by pass the bag to the UDF ? Pass it as part of the input to the udf in exec and initialize it only once (first time) ? (If yes, this is expensive) Or something else ? Regards, Mridul > > 2012/6/26 Mridul Muralidharan <[email protected]> > > > You could dump the data in a dfs file and pass the location of the > > file as param to your udf in define - so that it initializes itself > > using that data ... > > > > > > - Mridul > > > > > > > -----Original Message----- > > > From: Dexin Wang [mailto:[email protected]] > > > Sent: Tuesday, June 26, 2012 10:58 PM > > > To: [email protected] > > > Subject: Passing a BAG to Pig UDF constructor? > > > > > > Is it possible to pass a bag to a Pig UDF constructor? > > > > > > Basically in the constructor I want to initialize some hash map so > > > that on every exec operation, I can use the hashmap to do a lookup > > > and find the value I need, and apply some algorithm to it. > > > > > > I realize I could just do a replicated join to achieve similar > > > things but the algorithm is more than a few lines and there are > some > > > edge cases so I would rather wrap that logic inside a UDF function. > > > I also realize I could just pass a file path to the constructor and > > > read the files to initialize the hashmap but my files are on > > > Amazon's S3 and I don't want to deal with > > > S3 API to read the file. > > > > > > Is this possible or is there some alternative ways to achieve the > > > same thing? > > > > > > Thanks. > > > Dexin > >
