Yes, i didn't use RestGraphDB in my plugin. I used it in my test project
for connection from Intellij idea project to neo4j database. Database
consists of about 50K nodes and 100K relationships.
I'm running neo4j 3.3.1. For plugin creation use neo4j-kernel 3.3.1 .
For test i created a procedure below. It finds paths from one point to
another including at least one point from a set of 3 points. Traverser
spend too much time to find this paths. 17-20s.
And i really need bidirectional. And the graph later will be much more
bigger (millions elements).
May be i need to change smth in neo4j properties? I dont know.
My RAM 8G.
dbms.memory.heap.initial_size=1000m
dbms.memory.heap.max_size=2000m
dbms.memory.pagecache.size=5000m
@Procedure(value = "mytraverser.pathIncludingAtLeastOneNode")
@Description("createIncludingAtLeastOneNode")
public void createIncludingAtLeastOneNode(@Name("startPoint") String
startPoint, @Name("endPoint") String endPoint) {
try (Transaction tx = db.beginTx()) {
TraversalDescription td = db.traversalDescription().depthFirst()
.uniqueness(Uniqueness.NODE_PATH)
.uniqueness(Uniqueness.RELATIONSHIP_PATH)
.relationships(RelationshipTypes.rel, Direction.BOTH)
.evaluator(Evaluators.includingDepths(0, 10));
Traverser tr = td
.evaluator(Evaluators.includeWhereEndNodeIs(db.getNodeById(db.findNode(Labels.nodes,
"id", "9149892904013846978").getId())))
.evaluator(new PathEvaluator.Adapter() {
@Override
public Evaluation evaluate(Path path, BranchState
branchState) {
if (path.length()==0) return
Evaluation.INCLUDE_AND_CONTINUE;
else {
ArrayList<Node> listNode = new ArrayList<>();
for (Node n:path.nodes()){
listNode.add(n);
}
if
(listNode.contains(db.getNodeById(db.findNode(Labels.nodes, "id",
"9149892904013846972").getId())) ||
listNode.contains(db.getNodeById(db.findNode(Labels.nodes, "id",
"9149892904013846980").getId())) ||
listNode.contains(db.getNodeById(db.findNode(Labels.nodes, "id",
"9149892904013846974").getId()))) {
return Evaluation.INCLUDE_AND_CONTINUE;
} else {
return Evaluation.EXCLUDE_AND_CONTINUE;
}
}
}
})
.sort(new PathSorting("weight"))
.traverse(db.getNodeById(db.findNode(Labels.nodes, "id",
"9149892904413851091").getId()));
createPath(tr, "IncludingAtLeastOneNode");
tx.success();
}
}
среда, 31 января 2018 г., 14:59:09 UTC+3 пользователь Michael Hunger
написал:
>
> Can you share your full code somewhere?
>
> RestGraphDB should not be used.
>
> Which version are you runnign on?
>
> Your plugin doesn't do anyting you have to actually use the traverser to
> extract the nodes or paths.
>
>
>
> Do your really need 10 levels of bidirectional (BOTH!) relationships? That
> is potentially billions of paths.
> You can add a counter in the relationship-expander to see how many rels
> are hit.
>
> Can't you just use shortestpath?
>
>
>
> > Am 31.01.2018 um 10:45 schrieb Svetlana Usacheva <poph...@gmail.com
> <javascript:>>:
> >
> > Hello! I have a problem with my plugin. Firstly, i tried work with my
> database of 150K elements from my app using RestGraphDatabase for
> connection. Implementation takes about 3 s. Then i built jar and put it in
> folder "plugins". So now i can use my procedures from plugin, but they work
> much slower (about 17 s). Can i speed up my plugin and how i can do it?
> >
> > Procedures looks like that:
> >
> > import org.neo4j.procedure.Context;
> > import org.neo4j.procedure.Description;
> > import org.neo4j.procedure.Name;
> > import org.neo4j.procedure.Procedure;
> >
> > public class MyTraverser{
> >
> > @Context
> > public GraphDatabaseService db;
> >
> > @Procedure(value = "path")
> > @Description("createPath")
> > public void createPath(@Name("startPoint") String startPoint,
> @Name("endPoint") String endPoint) {
> >
> > try (Transaction tx = db.beginTx()) {
> > TraversalDescription td =
> db.traversalDescription().depthFirst()
> > .uniqueness(Uniqueness.NODE_PATH)
> > .relationships(RelationshipTypes.rel,
> Direction.BOTH)
> > .evaluator(Evaluators.includingDepths(0, 10));
> >
> > Traverser tr = td
> >
> .evaluator(Evaluators.includeWhereEndNodeIs(endPoint)
> > .traverse(startPoint);
> >
> > tx.success();
> > }
> > }
> > }
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "Neo4j" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to neo4j+un...@googlegroups.com <javascript:>.
> > For more options, visit https://groups.google.com/d/optout.
>
>
--
You received this message because you are subscribed to the Google Groups
"Neo4j" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to neo4j+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
