Kiran, To answer your question directly, in an AbstractComputation class (or whatever descendant you're using), you may call getWorkerContext().getMyWorkerIndex() (here <https://giraph.apache.org/apidocs/org/apache/giraph/worker/WorkerContext.html>). However, if each vertex has metadata associated to it, I think the best way to go would be to define a custom VertexReader <https://giraph.apache.org/apidocs/org/apache/giraph/io/class-use/VertexReader.html> and custom Vertex type to take that into account when reading the vertex.
Best, Matthew On Fri, Nov 28, 2014 at 1:02 PM, Garimella Kiran <kiran.garime...@aalto.fi> wrote: > Hi all, > > Is there a clean way to find out which worker a particular vertex is > assigned to? > > From what I tried out, I found that given n workers, each node is > assigned to the worker with id (vertex_id % n ). Is that a safe way to do > this? > > I’ve had a look at previous discussions, but most of them have no answer. > > ————————— > > Why I need it: > > In my application, each vertex needs to know some additional meta data, > which is loaded from file. This metadata file is huge (>50 G) and so, on > each worker, I only want to load the metadata corresponding to the vertices > present on that worker. > > ————————— > > > Previous discussions: > 1. > http://mail-archives.apache.org/mod_mbox/giraph-user/201310.mbox/%3C7EC16F82718A6D4A920A99FE46CE7F4E2861F779%40MERCMBX19R.na.SAS.com%3E > 2. > http://mail-archives.apache.org/mod_mbox/giraph-user/201403.mbox/%3CCAMf08QYE%2BRgUv9otXT6oPJorTNjQ-Ay8p4NUiuhds8%2BzgDzs1w%40mail.gmail.com%3E > > > > Regards, > Kiran >
