Thanks Max, I'm unsure what you mean by the "batch part" and "streaming execution"... Are you saying that I have to run my entire pipeline in either batch or streaming modes?
Perhaps a brief description of what I'm trying to do would help: 1. I've got some historical intervalized timeseries data 2. I've also got some live intervalized timeseries data 3. I want to process both those flows of data in a uniform fashion: calculating windowed statistics 4. My thought was that I'd have the historical data stored in some easy data store for Beam (e.g. HDFS) 5. I'd put live data on Kafka 6. Then load up 2 PCollections, one from HDFS and one from Kafka 7. Then perform a Flatten transform to get them in one PCollection 8. Then run my windowing over the flattened PCollection 9. ... I like this approach, because my transforms don't have to care about whether data is live or historical and I can have one processing pipeline for both. Am I barking up the wrong tree? Is my mental model way off, with respect to how to combine historical and live data? Thanks Bill > On Mar 30, 2016, at 5:59 AM, Maximilian Michels <[email protected]> wrote: > > Hi Bill, > > The batch part of the Flink Runners supports reading from a finite > collection, but I'm assuming you're working with the streaming execution of > the Flink runner. We haven't implemented support in the Runner yet but Flink > natively supports reading from finite sources. So it looks fairly easy to > implement. I've filed a JIRA issue and would like to look into this later > today. > > I've recently added a test case (UnboundedSourceITCase) which throws a custom > exception when the end of the output has been reached. Admittedly, that is > not a very nice approach but it works. All the more, we should support finite > sources in streaming mode. > > Best, > Max > >> On Wed, Mar 30, 2016 at 2:43 AM, William McCarthy >> <[email protected]> wrote: >> Hi, >> >> I want to get access to a bounded PCollection in Beam on the Flink runner. >> Ideally, I’d pull from HDFS. Is that supported? If not, what would be the >> best way for me to get something bounded, for testing purposes? >> >> Thanks, >> >> Bill >
