Hey Tran Nam-Luc! Great post with some really cool thoughts. I just posted this answer to your LinkedIN post.
Greetings, Stephan ============================================= Nice post, very cool idea! Your understanding of Flink in that respect is really good. I had not heard of SSP before, but it seems to be a good compromise between bulk synchronous and asynchronous iterations. Here are some comments and thought about how Apache Flink realizes iterations and how that mechanism can be extended to support SSP: - The loop in Flink is standing, operators are not re-created and re-deployed in every iteration. - We signal the end of a superstep by pushing a special message from the "head" of the loop to the "tail". This can be thought of like a clock cycle. Currently, the new superstep starts on each parallel thread once all "tails" have received the message, thus forming the BSP barrier. For delta iterations, this "tail" is the next workset - the solution set completely independent of that. - We can probably interpret the "end-of-superstep" messages as clock messages. We could then allow threads to start their next superstep if all "tails" have seen clock messages at least of its own clock time minus the slack. If you are looking to implement this in Flink, or dig deeper into this, let me know, I would be happy to help. On Fri, Feb 20, 2015 at 5:27 PM, Nam-Luc Tran <namluc.t...@euranova.eu> wrote: > Hello Everyone, > > I am Nam-Luc Tran, research Engineer at EURA NOVA [1]. Our research > subjects cover distributed machine learning and we have been working > on dataflow graph processing for a while now. We have been reading > from you since Stratosphere :-) > > Our current research focuses on Stale Synchronous Parallelism and we > are currently considering Apache Flink as a good candidate for > implementing and delivering the best results among the existing > processing solutions. I have written a post about it here: > > https://www.linkedin.com/pulse/stale-synchronous-parallelism-new-frontier-apache-flink-nam-luc-tran > > > What do you guys think about the approach? Does it seem feasible, or > do you have anything similar in your roadmap? > > Best regards, > > Tran Nam-Luc > > > > Links: > ------ > [1] http://euranova.eu > >
