On Fri, Feb 7, 2014 at 9:44 AM, Alexander Frolov <alexndr.fro...@gmail.com>wrote:
> Thank you, I will try to do this. As I understood I should set number of >> threads manually through Giraph API. >> >> BTW, what is conceptual difference between running multiple workers on >> the TaskTracker and running single worker and multiple threads? In terms of >> vertex fetching, memory sharing etc. >> > Basically, better usage of resources: one single JVM, no duplication of core data structures, less netty threads and communication points, more locality (less messages over the network), less actors accessing zookeeper etc. > >> Also I would like to ask how message transfer between vertices is > implemented in terms of Hadoop primitives? Source code reference will be > enough. > Communication does not happen via Hadoop primitives, but ad-hoc via netty. -- Claudio Martella
