Hi again, i get an answer for this in Stack Overflow <http://stackoverflow.com/questions/29243211/pagerankbenchmark-reduce-at-0-giraph-example/30476769#30476769>, i will leave it here: *"Giraph following map-only paradigm. In other words, each worker is associated with a map task. all of computations is performed within just map task and communication between map-tasks in order to send / receive messages is done by using of zookeeper. So, it is unlike of traditional map-reduce programming paradigm which map outputs transmitted to reducers. Therefore, there is no reduce task and no map output as well."*
Let's hope that this answer is useful for other's too. Bye! 2015-03-24 17:46 GMT-03:00 José Luis Larroque <[email protected]>: > I'm sorry, here are the mapper's logs, please tell me if something else is > needed. > > Here they go in the attachments > > Thanks! > > 2015-03-24 17:30 GMT-03:00 José Luis Larroque <[email protected]>: > >> Hi guys, i'm testing my Single Node Cluster Giraph installation using >> PageRankBenchmark example, in the following way: >> >> *$HADOOP_HOME/bin/hadoop jar >> >> /usr/local/hadoop/share/hadoop/mapreduce/giraph-examples-1.1.0-for-hadoop-2.4.0-jar-with-dependencies.jar >> org.apache.giraph.benchmark.PageRankBenchmark -v -V 1000 -e 1 -s 5 -w 1* >> >> >> But after's the mappers complete their job, reducer's don't start. My >> question is, this is correct? >> >> >> Because i understand that if a mapper get executed, a reducer has to >> start to take the map's output as an input and finish the work. But i >> google it, and always PageRankBenchmark (and ShortestPathExample too) ends >> with Reduce at 0%. Here it's an example : >> http://stackoverflow.com/questions/25084629/classnotfoundexception-running-giraphrunner-on-a-modified-simpleshortestpathsver >> >> >> So, i don't no if it's ok that in PageRankBenchmark and >> ShortestPathExample says that Reduce is at 0% >> >> >> I'm using hadoop 2.4, with Phadoop_yarn profile. >> >> >> Hope someone could help me. >> >> Bye! >> >> >> Jose >> >> >
