Thanks Peter, I studied how the HA works in http://docs.neo4j.org/chunked/snapshot/ha-how.html. It mentioned that "If the new master is elected and performs changes before the old master recovers, there will two different versions of the data. The old master will not be able to attach itself to the cluster and will require maintenance (replace the wrong version of the data with the one running in the cluster".
Say, I have two neo4j instances(A & B) running, When instance A crashed, B continues to work and has many writes on it. Then Server A is recovered but it can not attach itself to the cluster as the wrong data version. So I need to manually replace the instance A's data using B's. But the graph size is around 4G, I have to copy all the 4G data to server A? Or any other simple and fast ways? Regards, Samuel 2011/12/6 Peter Neubauer <peter.neuba...@neotechnology.com> > Samuel, > I would recommend HA for your usecase, since then the Neo4j cluster > will handling new neo4j instances appearing and copying data etc. Look > at http://docs.neo4j.org/chunked/snapshot/ha.html for setup docs. > > There seems to be some interest in RMI remoting to neo4j. However, we > think this is not the ultimate way to go in the long run since it is > Java-centric and still not fast and stable enough for want we want to > achieve. However, if the community finds it useful, I am all up for > someone stepping up and invest the last mile to make it good, maybe > put it on GIThub for easier collaboration, of course. > > Tobias original code is at > https://svn.neo4j.org/components/remote-graphdb/trunk/, and the API > should not have moved terribly out of sync, so I guess it is not a LOT > of work to at least get it working. > > Anyone? > > Cheers, > > /peter neubauer > > GTalk: neubauer.peter > Skype peter.neubauer > Phone +46 704 106975 > LinkedIn http://www.linkedin.com/in/neubauer > Twitter http://twitter.com/peterneubauer > > brew install neo4j && neo4j start > heroku addons:add neo4j > > > > On Tue, Dec 6, 2011 at 4:43 AM, Samuel Feng <okos...@gmail.com> wrote: > > Dear List, > > > > I'm using neo4j 1.5GA and using embeddedGraphDatabase to access the > graph. > > Now the graph size is around 4G. > > > > Now I would like to try HA mode and have several questions. > > > > 1) Can I access the graph in some kind of remote mode? So that I can use > > many tomcat servers to access the graph remotely and do not need to > change > > any code. I understand neo4j can run as a server, however, we can only > use > > REST api to accessing the neo4j server, this will cause many many code > > changes for me. Please correct me if I have any misunderstanding. > > > > Seems there is a neo4j-remote-graphdb component which uses RMI to access > a > > graph remotely. BUT in the wiki > > http://components.neo4j.org/neo4j-remote-graphdb/stable/, you mentioned > "The > > implementation is not speedy enough to be used as the main access channel > > to a Graph Database for actual applications." > > > > 2) If I use neo4j embedded in HA mode, say, I have two neo4j instances(A > & > > B) running, When instance A crashed, B continues to work and has many > > writes on it. Then Server A is recovered but it can not attach itself to > > the cluster as the wrong data version. So I need to manually replace the > > instance A's data using B's. > > > > But the graph size is around 4G, I have to copy all the 4G data to server > > A? Or any other simple and fast ways? > > > > Thanks and Regards, > > > > Samuel > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > -- > > You received this message because you are subscribed to the Google > Groups "Neo4j User Discussions" group. > > To post to this group, send email to u...@neo4j.org. > > To unsubscribe from this group, send email to user+unsubscr...@neo4j.org > . > > For more options, visit this group at > http://groups.google.com/a/neo4j.org/group/user/?hl=en. > > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
