You can get the number of tasks/peers via the BSPPeer object that you can obtain inside your vertex via getPeer().getNumPeers(). Suraj already told you the overall procedure, but I would consult you to use the state machine of a vertex. So computation stops if no message has been send and no vertex is active any more. In case of a graph you can always send a message to a "master" vertex, e.G. with the ID of 0. Therefore you can send a message to a vertex key with the method sendMessage(V destinationVertexID, M msg).
Good luck! 2012/11/30 Du Zhengjun <[email protected]> > Yes you are right. I am planning to use the vertex API, and the 'node' > imply a vertex in a graph. > > Sorry for my ambiguous express. > > Thank you for your quick reply :) > > > On Sat, Dec 1, 2012 at 12:47 AM, Thomas Jungblut > <[email protected]>wrote: > > > Wait a second, can you tell us what kind of API are you using? I assume > you > > use the vertex API in the graph package right? > > > > 2012/11/30 Suraj Menon <[email protected]> > > > > > Hi lee, > > > > > > I am assuming 'node' here implies BSP peer. > > > > > > You would have this feature once I get HAMA-652 ( > > > https://issues.apache.org/jira/browse/HAMA-652) working. For now you > can > > > do > > > something similar to what is done is graph processing. > > > Keep sending a vote to halt(message) to every other peers, when you > want > > to > > > halt, until in the next superstep you find that the number of votes == > > > number of peers. This is a limitation in the current implementation. We > > > need all the peers running together and peer.sync won't proceed until > all > > > the peers enter and leave the synchronization barrier. Please check the > > > progress on HAMA-652, it should get fixed in near future. > > > > > > Thanks, > > > Suraj > > > > > > On Fri, Nov 30, 2012 at 11:05 AM, lee fei <[email protected]> wrote: > > > > > > > Thank you for you help~ > > > > > > > > I need to know if there is any node active in last superstep to > > > > decide which the sub program should to process in the compute( ) > > > function. > > > > So if I can get the sum of alive nodes(not halted) in last superstep > or > > > the > > > > sum of messages sent in last superstep, I can easily make the > decision. > > > > > > > > Is there a way to do that? > > > > > > > > On Fri, Nov 30, 2012 at 8:30 PM, Edward <[email protected]> wrote: > > > > > > > > > It should be always equal to launched tasks num. Instead, we can > > count > > > > > failure tasks num. Why do you need? > > > > > > > > > > Sent from my iPhone > > > > > > > > > > On Nov 30, 2012, at 6:29 PM, lee fei <[email protected]> wrote: > > > > > > > > > > > Hi, > > > > > > > > > > > > Did hama have record the sum of alive nodes or sum of tasks in > > last > > > > > > superstep? Is there a way to get this kinds of values? > > > > > > > > > > > > Thank you for you attention:D > > > > > > > > > > > > > > >
