Re: zookeeper not starting

2013-08-06 Thread Kyle Orlando
I am having similar problems. Not really sure what's causing it. I've tried to specify giraph.zkList, as well as adding various directories to the classpath, but that of course didn't work. I would keep getting a connection exception for the localhost on the worker computers, which doesn't really

Re: Giraph vs good-old PVM/MPI ?

2013-08-06 Thread Avery Ching
The Giraph/Pregel model is based on bulk synchronous parallel computing, where the programmer is abstracted from the details of how the parallelization occurs (infrastructure does this for you). Additionally the APIs are built for graph-processing. Since the computing model is well defined

Re: Giraph vs good-old PVM/MPI ?

2013-08-06 Thread Claudio Martella
In principle you could implement (and it has been) Pregel through MPI. The idea behind Pregel was precisely to factor out typical patterns of graph processing that used to be based on message-passing and barriers. A framework like Pregel/Giraph hides this complexity through a well-defined API and