If it's not urgent I'll help benchmark. On Thu, May 17, 2012 at 4:39 PM, Aditya Sarawgi <[email protected]> wrote: > Thanks Thomas. > I am actually using tags for something else. So for now using instanceof is > just fine with me. > > I had a couple of more questions, regarding benchmarking stuff on hama. I > have a working implementation of > Parallel row based icf that given a n x n matrix returns a decomposed n x p > matrix. > > https://github.com/truncs/hello-world/blob/master/src/main/java/edu/sunysb/cs/Icf.java > > Now I would like to test this on a big input and possibly in full > distributed mode, so I was wondering how do > people usually do these sort of benchmarking. > > Specifically, > 1) Do they setup a cluster on AWS ? > 2) What is like the standard way to load matrices in different nodes with a > custom partitioning scheme > 3) Is there anything else that I should know > > On Thu, May 17, 2012 at 3:20 AM, Thomas Jungblut < > [email protected]> wrote: > >> Hi Aditya, >> >> that's where the concept of Message Tagging comes into play. You have tags >> in each message which are hardcoded as Strings. >> But as Edward told you can use GenericWritable or ObjectWritable instead, >> so they will tag your messages with the classnames and give you the correct >> class. >> >> Is there any way by which I can pop from the receive queue ? >> >> >> peer.getCurrentMessage() is popping from the received queue. >> >> 2012/5/17 Aditya Sarawgi <[email protected]> >> >> > Hi, >> > >> > But thats not the only problem, consider this case >> > that there are variable number of messages being sent, so I would have to >> > maintain >> > counts for each peer pointing to the last unread message. >> > >> > Is there any way by which I can pop from the receive queue ? >> > >> > >> > On Wed, May 16, 2012 at 10:23 PM, Suraj Menon <[email protected] >> > >wrote: >> > >> > > Hi, >> > > >> > > Please take a look at this snippet of code copied and modified from >> > > Mapper class to implement your scenario. - >> > > >> > > >> > >> https://github.com/ssmenon/hama/edit/master/hama-mapreduce/src/org/apache/hama/computemodel/mapreduce/Trials.java >> > > Between lines 233 to 245 I am able to send different type of messages. >> > > With type checks and generics you shouldn't be encountering Classcast >> > > exception at receiving end too. I am yet to test the next superstep, >> > > shall update you with sample code for the next superstep mimicking >> > > your scenario for receiving. >> > > >> > > For elegance, we have an experimental Superstep#compute >> > > API(org.apache.hama.bsp.Superstep). I have encountered an issue in job >> > > submission framework with this method in distributed mode; fix for >> > > this would be pushed to trunk in next few hours. You can still run it >> > > using LocalBSPRunner for now. >> > > >> > > -Suraj >> > > >> > > On Wed, May 16, 2012 at 9:18 PM, Aditya Sarawgi >> > > <[email protected]> wrote: >> > > > Hi Edward, >> > > > >> > > > Yes that is what I did >> > > > I wrote an ArrayMessage class (doesn't use generics for now but can >> be >> > > > converted easily) >> > > > >> > > >> > >> https://github.com/truncs/hello-world/blob/master/src/main/java/edu/sunysb/cs/ArrayMessage.java >> > > > >> > > > But the problem is that I am sending a IntegerMessage before and >> after >> > > > reading the IntegerMessage I am sending >> > > > an ArrayMessage but the previous IntegerMessage is still there. >> > > > >> > > > On Wed, May 16, 2012 at 8:34 PM, Edward J. Yoon < >> [email protected] >> > > >wrote: >> > > > >> > > >> Hi, >> > > >> >> > > >> To send or receive multiple Message types, I think you can use >> > > >> GenericWritable. You can also implement your own GenericMessage and >> > > >> contribute it to our project! >> > > >> >> > > >> Hope this helps you. >> > > >> >> > > >> On Thu, May 17, 2012 at 7:48 AM, Aditya Sarawgi >> > > >> <[email protected]> wrote: >> > > >> > Hi Guys, >> > > >> > >> > > >> > I am wondering how do the receive queues in hama work. Consider >> this >> > > case >> > > >> > that I want to sent a different type of BSPMessage in 2 >> consecutive >> > > >> > superstep. >> > > >> > In this first superstep I am sending IntMessage and in the next >> one >> > I >> > > am >> > > >> > sending a ArrayMessage ( custom message class). >> > > >> > >> > > >> > Now in the second super step when I do a >> > > >> > while ((arrayMessage = (ArrayMessage) peer.getCurrentMessage()) >> != >> > > >> null) { >> > > >> > >> > > >> > it is throwing a java.lang.ClassCastException, which is obvious >> > since >> > > its >> > > >> > trying to cast IntMessage to ArrayMessage. >> > > >> > I thought the message is dropped from the queue after it is read, >> is >> > > this >> > > >> > not the case ? >> > > >> > And if it is not, how can this be handled elegantly ? >> > > >> > >> > > >> > -- >> > > >> > Cheers, >> > > >> > Aditya Sarawgi >> > > >> >> > > >> >> > > >> >> > > >> -- >> > > >> Best Regards, Edward J. Yoon >> > > >> @eddieyoon >> > > >> >> > > > >> > > > >> > > > >> > > > -- >> > > > Cheers, >> > > > Aditya Sarawgi >> > > >> > >> > >> > >> > -- >> > Cheers, >> > Aditya Sarawgi >> > >> >> >> >> -- >> Thomas Jungblut >> Berlin <[email protected]> >> > > > > -- > Cheers, > Aditya Sarawgi
-- Best Regards, Edward J. Yoon @eddieyoon
