Interesting; thanks Semih! I will try Graft out over the weekend.
> On Jun 4, 2014, at 11:00 AM, Semih Salihoglu <se...@stanford.edu> wrote: > > Hi Giraph Users, > > I wanted to introduce to you Graft, a project that some of us at Stanford > have built over the last quarter. If you are a Giraph user, who ran into an > annoying bug in which the code was throwing an exception or resulting in > incorrect looking messages or vertex values (e.g. NaNs or > NullPointerExceptions) and you had put in println statements into your > compute() functions, and then inspect logs of Hadoop workers for debugging > purposes, you should read on. You might find Graft very useful. > > In a nutshell, Graft is based on the idea of capturing the contexts under > which a bug becomes noticeable (an exception is thrown or an incorrect > message is sent, or a vertex is assigned an incorrect value) > programmatically. The captured contexts can then be visualized through a GUI. > The contexts that a user thinks could be helpful for catching the bug can > then be reproduced in a compilable program and the user can then use his/her > favorite IDE's debugger to do step-by-step debugging into the context. For > example, when a vertex v throws an exception, the user can reproduce the > context under which v throws the exception and then use (say) Eclipse to do > step-by-step debugging to see exactly what lines were executed that resulted > in the exception being thrown. > > On the testing side, Graft makes it easier to generate unit and end-to-end > tests by letting users curate small graphs through its GUI's testing mode, > and then generates code snippets which can be copied and pasted into a JUnit > test. > > The project is still under development but interested users can start using > it. We have a wiki with documentation and instructions on how to install and > use Graft: https://github.com/semihsalihoglu/graft/wiki. Since the project is > under development, we'd highly appreciate users to start using it and giving > us direction on how to make it more useful. Our emails are on the > documentation page. We also encourage interested developers to contribute to > it if there are requested features that we don't get to very quickly. > > Just a small note: Graft works for the Giraph at trunk: > https://github.com/apache/giraph/tree/trunk. We do not support earlier > version. In particular your programs need to be written by extending > Computation and optionally the Master class, instead of the older Vertex > class. > > Best, > > semih
