[Neo4j] Checking for unfinished transactions
How can I check if there are unfinished transactions? I want to do the same thing that is done when EmbeddedGraphDatabase is instantiated after a non-clean shutdown. Jul 31, 2011 5:06:12 PM org.neo4j.kernel.impl.transaction.xaframework.XaLogicalLog doInternalRecovery INFO: Non clean shutdown detected on log [/home/felipe/graph.db/nioneo_logical.log.2]. Recovery started ... Jul 31, 2011 5:06:12 PM org.neo4j.kernel.impl.transaction.TxManager init INFO: Unresolved transactions found, recovery started ... Jul 31, 2011 5:06:12 PM org.neo4j.kernel.impl.transaction.TxManager init INFO: Recovery completed, all transactions have been resolved to a consistent state. Is it too slow? I want to check if there are unfinished transactions to roll back them all. I'm writing a server and clients may not call finish() for some reason (unexpected errors) disobeying http://wiki.neo4j.org/content/Neo_Mistakes#Transactions_usage. I want to cleanup transactions on every new client connection so that every connection starts clean. Thanks, Felipe ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Hybrid Relational + Graph solution
Your approach is sensible if you have a lot of tooling / code around your relational model. I don't have. Do you use JPA or some other ORM or just plain JDBC ? None. I'm using PHP for the front end and Java for services using Thrift for communication between the PHP and Java. You might have a look at Spring Data Graph cross-store approach: http://bit-ly/sdg-html#cross-store (and perhaps Spring Data Graph in general http://springsource.org/spring-data/neo4j ) If you want to use the properties while traversing the graph it would probably more sensible to move the data to the graph? How big is your dataset? You wrote I'm _creating_ so if you start out, I'd try to go with the graph database. I think the APIs are clean and easy enough for your developers to get them, and you now also got cypher as query language which should be understandable for a developer. I will use Neo4J for the data that fits better in a graph and use PostgreSQL for table-friendly data because I'm really excited about Neo4J. Does your data(base) also contain like large blobs and such? Those should perhaps not be stored in the graph (it's not optimized for that kind of data). I'm actually starting this project now. I'll have posts and comments (not really large text fields). I don't think this kind of data should be modeled as a graph. I'm trying to make the code cache friendly using these abstractions used by Facebook: http://www.infoq.com/presentations/Evolution-of-Code-Design-at-Facebook I think this approach fits even better with NeoJ4 than any other ORM based solution. Thanks! Felipe ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Hybrid Relational + Graph solution
I'm creating a social network. I would like to use Neo4J to represent the relationships between people (FOLLOWS, WENT_TO, LIKES) and other objects I have in my network. I already started storing the users (and other objects) in PostgreSQL tables. Is it reasonable to use PostgreSQL to store the objects while using Neo4J to store the relationships between these objects? I would use ids as vertex properties and would fetch the data for each object from PostgreSQL. One problem I see with this approach is that if I want to traverse the graph and use the data of the objects I would have to duplicate the data and add more properties to the vertexes. But I also think that minimizing the use of Neo4J would make it easier for the other developers of the team that are used to relational databases. Do you see more problems on this approach? Does it make thinks much more complicated? Thanks! Felipe ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
