Hi Pieter, we have not added the option to choose message direction in the GSA iterations yet, but this should be added soon (related JIRA: https://issues.apache.org/jira/browse/FLINK-2141). I guess the way you suggest, running GSA on the graph after reversing the edges, is how to do this now, yes.
Let us know if you have further questions! -Vasia. On 15 June 2015 at 08:07, Pieter-Jan Van Aeken < pieterjan.vanae...@euranova.eu> wrote: > Hi, > > I would first like to do a Gather-Sum-Apply iteration where gather > collects data from incoming edges and their connected node, and in a > second step I would like to do a GSA iteration in the opposite > direction. I have already done this using vertex-centric iterations > and it works, but since GSA is distributed across edges in stead of > vertices, I would like to reimplement the same algorithm using GSA. > This raised two questions: > > 1. Is the GSA iteration by default only gathering from incoming > edge/node pairs? If so, then a valid approach would probably be > > graph.run(gsa-incoming) > graph.reverse() > graph.run(gsa-outgoing) > > 2. If not, is there some option I can configure to achieve the > same result? > > Regards, > > Pieter-Jan Van Aeken > >
