Yeah, sorry about missing the promise to release code. I'll talk to someone about releasing what we have.
On Tue, Jan 24, 2012 at 11:05 AM, Felix GV <fe...@mate1inc.com> wrote: > Hello :) > > For question 1: > > The hadoop consumer in the contrib directory has almost everything it needs > to do distributed incremental imports out of the box, but it requires a bit > of hand holding. > > I've created two scripts to automate the process. One of them generates > initial offset files, and the other does incremental hadoop consumption. > > I personally use a cron job to periodically call the incremental consumer > script with specific parameters (for topic and HDFS path output). > > You can find all of the required files in this gist: > https://gist.github.com/1671887 > > The LinkedIn guys promised to release their full Hadoop/Kafka ETL code > eventually but I think they didn't have time to get around to it yet. When > they do release it, it's probably going to be better than my scripts, but > for now, I think those scripts are the only publically available way to do > this stuff without writing it yourself. > > I don't know about question 2 and 3. > > I hope this helps :) ! > > -- > Felix > > > > On Tue, Jan 24, 2012 at 3:24 AM, Paul Ingles <p...@forward.co.uk> wrote: > > > Hi, > > > > I'm investigating using Kafka and would really appreciate getting some > > more experienced opinion on the way things work together. > > > > Our application instances are creating Protocol Buffer serialized > messages > > and pushing them to topics in Kafka: > > > > * Web log requests > > * Product details viewed > > * Search performed > > * Email registered > > etc... > > > > I would like to be able to perform incremental loads from these topics > > into HDFS and then into the rest of the batch processing. I guess I had 3 > > broad questions > > > > 1) How do people trigger the batch loads? Do you just point your > > SimpleKafkaETLJob input to the previous runs outputted offset file? Do > you > > move files between runs of the SimpleKafkaETLJob- move the part-* file > into > > one place and move the offsets into an input directory ready for the next > > run? > > > > 2) Yesterday I noticed that the hadoop-consumer's SimpleKafkaETLMapper > > outputs Long/Text writables and is marked as deprecated (this is in the > 0.7 > > source). Is there an alternative class that should be used instead, or is > > the hadoop-consumer being deprecated overall? > > > > 3) Given the SimpleKafkaETLMapper reads bytes in but outputs Text lines, > > are most people using Kafka for passing text messages around or using > JSON > > data etc.? > > > > Thanks, > > Paul >
