Re: [Neo4j] java.lang.UnsupportedOperationException
The BatchInserter#getGraphDbService() is only there to have the batch inserter look like a GraphDatabaseService, so that you wouldn't have to rewrite your code to be able to import it with the batch inserter. index() support haven't been implemented there... but you should really use LuceneBatchInserterIndexProvider, see http://docs.neo4j.org/chunked/stable/indexing-batchinsert.html 2011/8/2 ahmed.elsharkasy ahmed.elshark...@gmail.com I am receiving java.lang.UnsupportedOperationException with new BatchInserterImpl(neo4j_directory).getGraphDbService().index() can you please help me ? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/java-lang-UnsupportedOperationException-tp3218626p3218626.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4J SQLIMporter question
Donovan, I just spend a few hours to bring the SQL Importer project up to date, see https://github.com/peterneubauer/sql-import for a screenshort of an imported SQL file that models books, authors, and a related tag hierarchy and tag relations. Much of what you need should be there. Looking at https://github.com/peterneubauer/sql-import/blob/master/src/test/java/com/neo4j/sqlimport/InsertTest.java#L80 you can omit the subreference nodes creation since it potentially creates supernodes and is not used for anything practical in the import. Is that helping along the way? If you want, contact me with your example data and we can work out an import setup. 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Aug 10, 2011 at 10:43 AM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Donovan, The project is on GIThub, https://github.com/peterneubauer/sql-import and I am right now porting it to Neo4j 1.4. However, I have limited bandwidth, I suspect it will take me some evenings to get it working properly again. Is that ok? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Tue, Aug 9, 2011 at 9:54 PM, dhsieh dhsie...@yahoo.com wrote: Yes, something similar -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Re-Neo4j-Neo4J-SQLIMporter-question-tp2508296p3240150.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
[Neo4j] Change multiple relations in one operation
Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Replication corner cases?
Hello, I read through the HA/replication documentation at http://docs.neo4j.org/chunked/stable/ha.html but a few question about possible failure modes remains: Can a HA transaction fail after it's committed on master? Consider the following: client C1 commits transaction T through slave S1, which propagates it to master M, which commits it. What happens to T if S1 crashes now? How does client C1 see this? If T is rolled back on M upon fialure of S1, can client C2 read the result of T from M before S1 has committed T? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Change multiple relations in one operation
Carl, this is what you can do. Relationships are immutable, that is, once created you have to delete them and create new ones in order to change endpoints. Not much choice there. What is the size of your reassignments and the number of relationships in one transaction? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Aug 11, 2011 at 4:47 PM, cnordenfelt carl.nordenf...@gmail.com wrote: Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
[Neo4j] Further information about Neo4J
Hello,
My name is Bruno Paiva Lima da Silva, and I am a PhD student at LIRMM in
Montpellier, France investigating graph-based conjunctive query
answering. A very quick description of my thesis can be found at: [
http://bplsilva.com/en/ ] , or, for more details, please check my
presentations [ http://bplsilva.com/en/research/talks/ ].
The reason why I am writing to you is that I require further information
regarding your storage system. In my work I aim comparing several
different storage systems for conjective querying. To this end I have
implemented a common and abstract interface in Java that uses in the
logical representation (as defined in First-Order Logic) of a factual
piece of knowledge. The formula is then sent to different storage
systems (e.g. DEX, HyperGraph, MySQL, Neo4J, OrientDB, Sqlite, and
others), one of them being your system, and the storage and querying
time is then logged for further analysis and comparisons.
To this end, I am testing this architecture by the means of an
incrementally large RDF file, that can go from 10k triples up to 5M
triples (and more).
The main reason of this e-mail, beside annoucing you that I am using
your system in a research scope, is to understand whether I am using it
correctly for our purpose, ensuring the validity of the results I obtain
when I run my tests.
I am particularly interested in knowing whether I am using the best
solution with Neo4J within 6 of our functions. In red you will find the
way we perform it as of today.
- (1) Creating a new graph
public Neo4jGraph(String s) throws Exception {
super(s);
directory = alaska-data/neo4j/ + s;
graph = new EmbeddedGraphDatabase(directory);
}
- (2) Adding a new node to the graph
public long addTerm(Object label) {
MapString,Object properties = new
HashMapString,Object();
properties.put(label,label.toString());
long newNode = inserter.createNode(properties);
batchIndex.add(newNode,properties);
batchIndex.flush();
return newNode;
}
- (3) Adding a new edge to the graph
public void addAtom(Object predicateLabel, ArrayListObject
termObjects) throws Exception {
Long n1 = getNodeByLabel(termObjects.get(0));
Long n2 = getNodeByLabel(termObjects.get(1));
if (n1 == null) { n1 = addTerm(termObjects.get(0)); }
if (n2 == null) { n2 = addTerm(termObjects.get(1)); }
if (n1 != n2) {
inserter.createRelationship(n1,n2,DynamicRelationshipType.withName(predicateLabel.toString()),null);
}
}
- (4) Retrieving all the nodes of the graph
public ArrayListITerm getTerms() throws Exception {
ArrayListITerm terms = new ArrayListITerm();
for (Node n : graph.getAllNodes()) {
if (n.getId() != 0) {
Term newTerm = new
Term(n.getProperty(label));
terms.add(newTerm);
}
}
return terms;
}
- (5) Retrieving all the edges of the graph
public ArrayListIAtom getAtoms() throws Exception {
ArrayListIAtom atomsToReturn = new ArrayListIAtom();
for (Node n : graph.getAllNodes()) {
IterableRelationship rel =
n.getRelationships(Direction.OUTGOING);
for (Relationship r : rel) {
String predFullName =
r.getType().toString();
int predStart =
predFullName.indexOf([) + 1;
String predName =
predFullName.substring(predStart,predFullName.length()-1);
Predicate pred = new
Predicate(predName,2);
ArrayListITerm atomTerms = new
ArrayListITerm();
ITerm nt1 = new
Term(r.getStartNode().getProperty(label));
ITerm nt2 = new
Term(r.getEndNode().getProperty(label));
atomTerms.add(nt1);
atomTerms.add(nt2);
IAtom newAtom = new Atom(pred,atomTerms);
atomsToReturn.add(newAtom);
}
}
return atomsToReturn;
}
- (6) Retrieving a node by its label
public Long getNodeByLabel(Object label) {
IndexHitsLong hits =
batchIndex.get(label,label.toString());
if (hits.size() == 0) { return null; }
else { return hits.getSingle(); }
}
- (7) Identifying whether there is an edge between two nodes or not
public boolean areConnected(ITerm t1,ITerm t2,Predicate p,int pos)
throws
Re: [Neo4j] Change multiple relations in one operation
Thanks For now I'm just prototyping and the case might be that there are several millions of relationshids that has to be changed in one transaction. However, it is a very uncommon operation and it might also be that the graph design should be changed to limit the number of relationships? //Carl On Thu, Aug 11, 2011 at 6:04 PM, Peter Neubauer [via Neo4j Community Discussions] ml-node+3246384-1725270690-421...@n3.nabble.com wrote: Carl, this is what you can do. Relationships are immutable, that is, once created you have to delete them and create new ones in order to change endpoints. Not much choice there. What is the size of your reassignments and the number of relationships in one transaction? 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 a href=http://www.neo4j.org http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Aug 11, 2011 at 4:47 PM, cnordenfelt [hidden email]http://user/SendEmail.jtp?type=nodenode=3246384i=0 wrote: Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=1 https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=2 https://lists.neo4j.org/mailman/listinfo/user -- If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246384.html To unsubscribe from Change multiple relations in one operation, click herehttp://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_codenode=3246141code=Y2FybC5ub3JkZW5mZWx0QGdtYWlsLmNvbXwzMjQ2MTQxfDQwNDcxMjI=. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246722.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Enhanced API wiki page
Nils, interesting approaches! However, IMHO the API is still too heavy to grasp with ConnectorType, EdgeElement, EdgeType and Edge being involved in creating connections between facts. Is anyone seeing a more fluent/concise approach to this? Also, did you have some ideas about how to traverse or query these hyperedges? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Aug 10, 2011 at 1:19 AM, Niels Hoogeveen pd_aficion...@hotmail.com wrote: Today I updated the wiki page for Enhanced API. Since the last edit many changes have taken place, so it was to to reflect those changes on the wiki page. See: https://github.com/peterneubauer/graph-collections/wiki/Enhanced-API I also changed what was previously called an EdgeRole into a Connector. Every Edge has a number of Connectors to which Vertices connect. The EdgeType of an Edge defines the ConnectorTypes of the Connectors of an Edge. Each ConnectorType and with that a Connector, has a ConnectionMode, which can be one of these four: Unrestricted: An Edge can connect to an unlimited number of Vertices through a Connector with an unrestricted mode, and a Vertex can have an unlimited number of connected Edges with a ConnectorType with an unrestricted ConnectionMode. Injective: An Edge can connect to only one Vertex through a Connector with injective mode, but a Vertex can have an unlimited number of connected Edges with a ConnectorType with an injective ConnectionMode. Surjective: An Edge can connect to an unlimited number of Vertices through a Connector with a surjective mode, but a Vertex can only have one Edge connected to it with a ConnectorType with a surjective ConnectionMode. Bijective: An Edge can connect to only one Vertex through a Connector with bijective mode, and a Vertex can only have one Edge connected to it with a ConnectorType with a bijective ConnectionMode. All ConnectionModes have been implemented. The switch from EdgeRole to Connector with ConnectionModes has eliminated some of the more annoying type parameters found in the previous incarnation of Enhanced API. ___ 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
Re: [Neo4j] Change multiple relations in one operation
A couple questions: - What are you changing? The properties of the relationship(s) or the relationships themselves? - Are you relationships many-to-many, one-to-many, or one-to-one? -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of cnordenfelt Sent: Thursday, August 11, 2011 1:55 PM To: user@lists.neo4j.org Subject: Re: [Neo4j] Change multiple relations in one operation Thanks For now I'm just prototyping and the case might be that there are several millions of relationshids that has to be changed in one transaction. However, it is a very uncommon operation and it might also be that the graph design should be changed to limit the number of relationships? //Carl On Thu, Aug 11, 2011 at 6:04 PM, Peter Neubauer [via Neo4j Community Discussions] ml-node+3246384-1725270690-421...@n3.nabble.com wrote: Carl, this is what you can do. Relationships are immutable, that is, once created you have to delete them and create new ones in order to change endpoints. Not much choice there. What is the size of your reassignments and the number of relationships in one transaction? 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 a href=http://www.neo4j.org http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Aug 11, 2011 at 4:47 PM, cnordenfelt [hidden email]http://user/SendEmail.jtp?type=nodenode=3246384i=0 wrote: Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=1 https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=2 https://lists.neo4j.org/mailman/listinfo/user -- If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246384.html To unsubscribe from Change multiple relations in one operation, click herehttp://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_codenode=3246141code=Y2FybC5ub3JkZW5mZWx0QGdtYWlsLmNvbXwzMjQ2MTQxfDQwNDcxMjI=. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246722.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
Re: [Neo4j] Further information about Neo4J
Salut Bruno, Could you clarify your intent for (2) and (3) please? Do you really mean to use the batch inserter there (that is, is this for an initial import), or are you trying to add data to a steady-state database? If the latter, then you need to read the core API: http://docs.neo4j.org/chunked/snapshot/tutorials-java-embedded-hello-world.html Jim PS - do keep this list appraised of your research, there are a number of academic folks here (including me) who would be interested. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Change multiple relations in one operation
It's the relationship itself (or to be exact it is the end node of all relationships to a specific node that I would like to change). The relationship is one to many. Actually it is a parent child relationship (one parent have multiple children) and I would like to reassign the parent for all children of a specific parent. //Carl On Thu, Aug 11, 2011 at 8:53 PM, Rick Bullotta rick.bullo...@thingworx.comwrote: A couple questions: - What are you changing? The properties of the relationship(s) or the relationships themselves? - Are you relationships many-to-many, one-to-many, or one-to-one? -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of cnordenfelt Sent: Thursday, August 11, 2011 1:55 PM To: user@lists.neo4j.org Subject: Re: [Neo4j] Change multiple relations in one operation Thanks For now I'm just prototyping and the case might be that there are several millions of relationshids that has to be changed in one transaction. However, it is a very uncommon operation and it might also be that the graph design should be changed to limit the number of relationships? //Carl On Thu, Aug 11, 2011 at 6:04 PM, Peter Neubauer [via Neo4j Community Discussions] ml-node+3246384-1725270690-421...@n3.nabble.com wrote: Carl, this is what you can do. Relationships are immutable, that is, once created you have to delete them and create new ones in order to change endpoints. Not much choice there. What is the size of your reassignments and the number of relationships in one transaction? 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 a href=http://www.neo4j.org http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Aug 11, 2011 at 4:47 PM, cnordenfelt [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=0 wrote: Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=1 https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=2 https://lists.neo4j.org/mailman/listinfo/user -- If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246384.html To unsubscribe from Change multiple relations in one operation, click here http://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_codenode=3246141code=Y2FybC5ub3JkZW5mZWx0QGdtYWlsLmNvbXwzMjQ2MTQxfDQwNDcxMjI= . -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246722.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Extend the reference API
I use NEO4J Server with REST technology. For my proect needs , I want to add some features to Neo4J API For example , in the RelationShip API I want to give the user the opportunity to link between to nodes using unique identifier with an option to create them (one or both) if they are not exist? 1.Where\what is a good starting point to do so (in code/document ].. etc.) 2. As I said I am using REST technology , so what is the best way to add a node in a multi-threded environment? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Extend-the-reference-API-tp3247126p3247126.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Extend the reference API
Hi, you could use either * Server-Plugins: http://docs.neo4j.org/chunked/snapshot/server-plugins.html * Unmanaged Extensions:http://docs.neo4j.org/chunked/snapshot/server-unmanaged-extensions.html * or the (J)Ruby-Script-Extensions: http://wiki.neo4j.org/content/Ruby-script_extension For what you intend ServerPlugins should be the easiest way to go. You just add the node. Neo4j is thread safe. Cheers Michael Am 11.08.2011 um 21:14 schrieb shlomyb: I use NEO4J Server with REST technology. For my proect needs , I want to add some features to Neo4J API For example , in the RelationShip API I want to give the user the opportunity to link between to nodes using unique identifier with an option to create them (one or both) if they are not exist? 1.Where\what is a good starting point to do so (in code/document ].. etc.) 2. As I said I am using REST technology , so what is the best way to add a node in a multi-threded environment? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Extend-the-reference-API-tp3247126p3247126.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
Re: [Neo4j] Change multiple relations in one operation
If that is a very frequent operation, you could introduce an intermediate node that depicts the root of the tree which is fixed (and probably anonymous) and have that node have a single relationship to the parent which can be easily replaced. Cheers Michael Am 11.08.2011 um 21:06 schrieb Carl Nordenfelt: It's the relationship itself (or to be exact it is the end node of all relationships to a specific node that I would like to change). The relationship is one to many. Actually it is a parent child relationship (one parent have multiple children) and I would like to reassign the parent for all children of a specific parent. //Carl On Thu, Aug 11, 2011 at 8:53 PM, Rick Bullotta rick.bullo...@thingworx.comwrote: A couple questions: - What are you changing? The properties of the relationship(s) or the relationships themselves? - Are you relationships many-to-many, one-to-many, or one-to-one? -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of cnordenfelt Sent: Thursday, August 11, 2011 1:55 PM To: user@lists.neo4j.org Subject: Re: [Neo4j] Change multiple relations in one operation Thanks For now I'm just prototyping and the case might be that there are several millions of relationshids that has to be changed in one transaction. However, it is a very uncommon operation and it might also be that the graph design should be changed to limit the number of relationships? //Carl On Thu, Aug 11, 2011 at 6:04 PM, Peter Neubauer [via Neo4j Community Discussions] ml-node+3246384-1725270690-421...@n3.nabble.com wrote: Carl, this is what you can do. Relationships are immutable, that is, once created you have to delete them and create new ones in order to change endpoints. Not much choice there. What is the size of your reassignments and the number of relationships in one transaction? 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 a href=http://www.neo4j.org http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Aug 11, 2011 at 4:47 PM, cnordenfelt [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=0 wrote: Hi I have started to digg into neo4j and have not found a nice way to change many relationships from one node to another. For example, I have n1 with a relationship to m1, m2 and m3. Now I would like to change the relationship to point from n2 to m1, m2 and m3 instead. I could of course fetch all relationships from n1 and change each relationship individually to n2 but this will make me iterate over all relationships, which could be quite many. Is there any way to replace a node with another or to reassign multiple relationships with one operation? I'm currently using the Java API. Thanks Carl -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246141.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=1 https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list [hidden email] http://user/SendEmail.jtp?type=nodenode=3246384i=2 https://lists.neo4j.org/mailman/listinfo/user -- If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246384.html To unsubscribe from Change multiple relations in one operation, click here http://neo4j-community-discussions.438527.n3.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_codenode=3246141code=Y2FybC5ub3JkZW5mZWx0QGdtYWlsLmNvbXwzMjQ2MTQxfDQwNDcxMjI= . -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Change-multiple-relations-in-one-operation-tp3246141p3246722.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list
[Neo4j] Very Slow Transaction only on Windows
Hi.
I have a summer student working on Cytoscape (graph
visualization/analysis software)-Neo4j integration project using
Blueprints framework.
https://github.com/keiono/blueprints-graph-cytoscape/wiki
Currently, I've got a question from him which I do not know the answer.
Here is the very simple test code. It adds 1000 Vertices to Neo4j
Graph using CommitManager:
@Test
public void testPerformance() {
long start = System.currentTimeMillis();
final CommitManager manager =
TransactionalGraphHelper.createCommitManager(
(TransactionalGraph) graphImplementation, 1000);
for (int i = 0; i 1000; i++) {
net.addNode();
manager.incrCounter();
}
manager.close();
final long time = (System.currentTimeMillis() - start);
System.out.println(Nodes added in + time + msec.);
assertEquals(1000, net.getNodeCount());
// If we does not use transaction utility method, this can be
minutes or hours...
assertTrue(2000time);
}
https://github.com/keiono/blueprints-graph-cytoscape/blob/master/src/test/java/org/cytoscape/blueprints/implementations/Neo4jTest.java
where net is a wrapper object for Cytoscape graph model, and addNode()
method simply calles graph.addVertex() method in Blueprints' Graph
API. This test passes in less than a second on my MacBook, but on
Windows PC, it takes 1+ minutes to finish. Seems transaction is not
working correctly on Windows, but I do not understand why it happens
only on Windows.
Could you give me any suggestions to solve this Windows-dependent problem?
Thanks,
Kei
Cytoscape Core Developer
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Re: [Neo4j] Very Slow Transaction only on Windows
Kei,
How much heap does he use for the test?
On windows memory mapped files are allocated within the java heap space not
outside as on *nix systems.
There is a messages.log in the graphdb directory.
Could you share its content with us?
Thanks so much
Michael
Am 11.08.2011 um 21:58 schrieb Keiichiro Ono:
Hi.
I have a summer student working on Cytoscape (graph
visualization/analysis software)-Neo4j integration project using
Blueprints framework.
https://github.com/keiono/blueprints-graph-cytoscape/wiki
Currently, I've got a question from him which I do not know the answer.
Here is the very simple test code. It adds 1000 Vertices to Neo4j
Graph using CommitManager:
@Test
public void testPerformance() {
long start = System.currentTimeMillis();
final CommitManager manager =
TransactionalGraphHelper.createCommitManager(
(TransactionalGraph) graphImplementation, 1000);
for (int i = 0; i 1000; i++) {
net.addNode();
manager.incrCounter();
}
manager.close();
final long time = (System.currentTimeMillis() - start);
System.out.println(Nodes added in + time + msec.);
assertEquals(1000, net.getNodeCount());
// If we does not use transaction utility method, this can be
minutes or hours...
assertTrue(2000time);
}
https://github.com/keiono/blueprints-graph-cytoscape/blob/master/src/test/java/org/cytoscape/blueprints/implementations/Neo4jTest.java
where net is a wrapper object for Cytoscape graph model, and addNode()
method simply calles graph.addVertex() method in Blueprints' Graph
API. This test passes in less than a second on my MacBook, but on
Windows PC, it takes 1+ minutes to finish. Seems transaction is not
working correctly on Windows, but I do not understand why it happens
only on Windows.
Could you give me any suggestions to solve this Windows-dependent problem?
Thanks,
Kei
Cytoscape Core Developer
--
Keiichiro Onohttp://www.keiono.net/
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Re: [Neo4j] Replication corner cases?
According to http://docs.neo4j.org/chunked/stable/ha-architecture.html, this is my understanding and I would like for confirmation from Neo4j: A slave will handle writes by synchronizing with the master to preserve consistency. It sounds like 2-phase commit between write initiated slave master nodes. Updates will however propagate from the master to other slaves eventually so a write from one slave is not immediately visible on all other slaves. It sounds like eventual consistency from master to other slaves. if so, I am interested in finding out details about Neo4j HA member nodes voting quorum arbitrater setup (assuming using zookeeper) -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Replication-corner-cases-tp3246146p3247312.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Very Slow Transaction only on Windows
Thanks for the quick reply.
I'll forward the e-mail to him.
By the way, here is my setting, which passes the test:
Thu Aug 11 12:45:50 PDT 2011: Physical mem: 4096MB, Heap size: 123MB
Thu Aug 11 12:45:50 PDT 2011: Kernel version: Neo4j - Graph Database
Kernel 1.4.1
Thu Aug 11 12:45:50 PDT 2011: Neo4j - Graph Database Kernel 1.4.1
Thu Aug 11 12:45:50 PDT 2011: Operating System: Mac OS X; version:
10.7; arch: x86_64; cpus: 4
Thu Aug 11 12:45:50 PDT 2011: VM Name: Java HotSpot(TM) 64-Bit Server VM
Thu Aug 11 12:45:50 PDT 2011: VM Vendor: Apple Inc.
Thu Aug 11 12:45:50 PDT 2011: VM Version: 20.1-b02-383
Kei
2011/8/11 Michael Hunger michael.hun...@neotechnology.com:
Kei,
How much heap does he use for the test?
On windows memory mapped files are allocated within the java heap space not
outside as on *nix systems.
There is a messages.log in the graphdb directory.
Could you share its content with us?
Thanks so much
Michael
Am 11.08.2011 um 21:58 schrieb Keiichiro Ono:
Hi.
I have a summer student working on Cytoscape (graph
visualization/analysis software)-Neo4j integration project using
Blueprints framework.
https://github.com/keiono/blueprints-graph-cytoscape/wiki
Currently, I've got a question from him which I do not know the answer.
Here is the very simple test code. It adds 1000 Vertices to Neo4j
Graph using CommitManager:
@Test
public void testPerformance() {
long start = System.currentTimeMillis();
final CommitManager manager =
TransactionalGraphHelper.createCommitManager(
(TransactionalGraph) graphImplementation,
1000);
for (int i = 0; i 1000; i++) {
net.addNode();
manager.incrCounter();
}
manager.close();
final long time = (System.currentTimeMillis() - start);
System.out.println(Nodes added in + time + msec.);
assertEquals(1000, net.getNodeCount());
// If we does not use transaction utility method, this can be
minutes or hours...
assertTrue(2000time);
}
https://github.com/keiono/blueprints-graph-cytoscape/blob/master/src/test/java/org/cytoscape/blueprints/implementations/Neo4jTest.java
where net is a wrapper object for Cytoscape graph model, and addNode()
method simply calles graph.addVertex() method in Blueprints' Graph
API. This test passes in less than a second on my MacBook, but on
Windows PC, it takes 1+ minutes to finish. Seems transaction is not
working correctly on Windows, but I do not understand why it happens
only on Windows.
Could you give me any suggestions to solve this Windows-dependent problem?
Thanks,
Kei
Cytoscape Core Developer
--
Keiichiro Ono http://www.keiono.net/
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Re: [Neo4j] Enhanced API wiki page
Hi Peter, The API is indeed a bit heavy to grasp, if you want to use N-ary edges. I don't know how to make that simpler without sacrificing functionality. For binary edges and properties, the API is very similar to the standard Neo4j API, give or take a some details. I have given it considerable thought how to traverse these hyperedges, and the answer is stunningly simple: the same as we would a binary edge. Right now we traverse from a Node to another Node by means of a RelatonshipType (given a Direction). We could also say in Enhanced API parlance that we traverse from a Vertex to a BinaryEdge following the StartConnector, then use the EndConnector to reach another Vertex. So traversing the graph requires that we provide a pair of Connectors. This works the same for N-ary edges, we still provide a pair of connector, helping to build the path we want to return. Example: Suppose we have stored the fact Tom, Dick and Harry give Flo and Eddie a Book and a Bicycle, as explained on the Wiki page. Suppose all people in the database can also be FRIENDs to other people. Now suppose we want to know the people who are friends of the people that Tom has given a gift to. We provide the traverser with (Giver, Recipient, GIFT) and with (StartConnector, EndConnector, FRIEND). Now we can of course further simplify this by making each step in the traversal to only follow one connector: (Giver, GIFT) (Recipient, GIFT) (StartConnector, FRIEND) (EndConnector, FRIEND) This way we can traverse not only from Vertex to Vertex (via an Edge), but to traverse from a Vertex to an Edge, to a property on that Edge. Since we want to return a path through the graph, we need to provide a list of Connectors describing how to get there. Interestingly enough the arity of an Edge has no impact on how the graph is traversed. It takes one connector to get to an Edge, and it takes one connector to get away from an Edge. Niels From: peter.neuba...@neotechnology.com Date: Thu, 11 Aug 2011 20:46:59 +0200 To: user@lists.neo4j.org Subject: Re: [Neo4j] Enhanced API wiki page Nils, interesting approaches! However, IMHO the API is still too heavy to grasp with ConnectorType, EdgeElement, EdgeType and Edge being involved in creating connections between facts. Is anyone seeing a more fluent/concise approach to this? Also, did you have some ideas about how to traverse or query these hyperedges? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Aug 10, 2011 at 1:19 AM, Niels Hoogeveen pd_aficion...@hotmail.com wrote: Today I updated the wiki page for Enhanced API. Since the last edit many changes have taken place, so it was to to reflect those changes on the wiki page. See: https://github.com/peterneubauer/graph-collections/wiki/Enhanced-API I also changed what was previously called an EdgeRole into a Connector. Every Edge has a number of Connectors to which Vertices connect. The EdgeType of an Edge defines the ConnectorTypes of the Connectors of an Edge. Each ConnectorType and with that a Connector, has a ConnectionMode, which can be one of these four: Unrestricted: An Edge can connect to an unlimited number of Vertices through a Connector with an unrestricted mode, and a Vertex can have an unlimited number of connected Edges with a ConnectorType with an unrestricted ConnectionMode. Injective: An Edge can connect to only one Vertex through a Connector with injective mode, but a Vertex can have an unlimited number of connected Edges with a ConnectorType with an injective ConnectionMode. Surjective: An Edge can connect to an unlimited number of Vertices through a Connector with a surjective mode, but a Vertex can only have one Edge connected to it with a ConnectorType with a surjective ConnectionMode. Bijective: An Edge can connect to only one Vertex through a Connector with bijective mode, and a Vertex can only have one Edge connected to it with a ConnectorType with a bijective ConnectionMode. All ConnectionModes have been implemented. The switch from EdgeRole to Connector with ConnectionModes has eliminated some of the more annoying type parameters found in the previous incarnation of Enhanced API. ___ 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
Re: [Neo4j] cant use index after commit
i followed your advice and it is now fairly good but i have a new performance issue with traversing i have this line of code Traverser travser = result.traverse(Traverser.Order.DEPTH_FIRST, StopEvaluator.END_OF_GRAPH, ReturnableEvaluator.ALL, DynamicRelationshipType.withName(name), Direction.OUTGOING); the number of nodes i traverse are on average 60 nodes , and it took me about 500 millisecond to traverse is this normal? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247801.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] cant use index after commit
How large is your graph? And how many connections do those nodes have? Thanks Michael Am 12.08.2011 um 01:50 schrieb ahmed.elsharkasy: i followed your advice and it is now fairly good but i have a new performance issue with traversing i have this line of code Traverser travser = result.traverse(Traverser.Order.DEPTH_FIRST, StopEvaluator.END_OF_GRAPH, ReturnableEvaluator.ALL, DynamicRelationshipType.withName(name), Direction.OUTGOING); the number of nodes i traverse are on average 60 nodes , and it took me about 500 millisecond to traverse is this normal? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247801.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
Re: [Neo4j] cant use index after commit
My graph contains 281 nodes with a total of 350 relationships . average outgoing edges per node less than 10 and the same for in going edges what do you think? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247898.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] cant use index after commit
Is this the first traversal, or the average time for several runs? Thanks Michael Am 12.08.2011 um 02:55 schrieb ahmed.elsharkasy: My graph contains 281 nodes with a total of 350 relationships . average outgoing edges per node less than 10 and the same for in going edges what do you think? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247898.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ 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
Re: [Neo4j] cant use index after commit
I just created a graph like yours and run the traversal test, it takes a few
milliseconds for the initial runs but with hot caches it executes almost
instantly.
Michael
node count = 952 took 72 ms
node count = 963 took 29 ms
node count = 957 took 39 ms
node count = 973 took 29 ms
node count = 967 took 16 ms
node count = 964 took 19 ms
node count = 952 took 7 ms
node count = 961 took 6 ms
node count = 957 took 6 ms
node count = 973 took 7 ms
node count = 967 took 8 ms
node count = 964 took 9 ms
node count = 1 took 0 ms
node count = 961 took 8 ms
node count = 1 took 2 ms
node count = 973 took 12 ms
node count = 967 took 11 ms
node count = 964 took 10 ms
node count = 952 took 11 ms
node count = 961 took 11 ms
node count = 957 took 12 ms
node count = 973 took 7 ms
node count = 967 took 11 ms
node count = 964 took 6 ms
node count = 952 took 7 ms
node count = 961 took 6 ms
node count = 957 took 6 ms
node count = 973 took 7 ms
node count = 967 took 4 ms
node count = 964 took 4 ms
node count = 952 took 4 ms
node count = 962 took 4 ms
node count = 957 took 4 ms
node count = 973 took 3 ms
node count = 967 took 3 ms
node count = 964 took 3 ms
node count = 952 took 3 ms
node count = 961 took 3 ms
node count = 957 took 3 ms
node count = 973 took 2 ms
node count = 967 took 5 ms
node count = 964 took 4 ms
node count = 952 took 4 ms
node count = 1 took 0 ms
node count = 957 took 3 ms
node count = 973 took 2 ms
node count = 967 took 2 ms
node count = 964 took 2 ms
node count = 954 took 2 ms
node count = 961 took 2 ms
node count = 957 took 1 ms
node count = 973 took 2 ms
node count = 967 took 1 ms
node count = 964 took 2 ms
node count = 952 took 2 ms
node count = 961 took 1 ms
node count = 958 took 2 ms
node count = 1 took 0 ms
node count = 967 took 1 ms
node count = 964 took 2 ms
package org.neo4j.performance.ahmed;
import org.apache.commons.io.FileUtils;
import org.neo4j.graphdb.*;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import java.io.File;
import java.io.IOException;
import java.util.Random;
public class TraverserTest {
public static final int INT = 1000;
enum Rels implements RelationshipType {
_1, _2, _3, _4, _5, _6;
private static Rels randomRel(Random random) {
final Rels[] values = values();
return values[random.nextInt(values.length)];
}
}
public static void main(String[] args) throws IOException {
final File dir = new File(target/traverse);
FileUtils.deleteDirectory(dir);
final EmbeddedGraphDatabase gdb = new
EmbeddedGraphDatabase(dir.getAbsolutePath());
final Random random = new Random(0);
createGraph(gdb, random);
for (int run = 0; run 10; run++) {
for (Rels rels : Rels.values()) {
runTraversal(gdb, random, rels);
}
}
}
private static void runTraversal(EmbeddedGraphDatabase gdb, Random random,
final Rels relType) {
final Node startNode = gdb.getNodeById(random.nextInt(INT));
long start = System.currentTimeMillis();
Traverser traverser = startNode.traverse(Traverser.Order.DEPTH_FIRST,
StopEvaluator.END_OF_GRAPH, ReturnableEvaluator.ALL, relType,
Direction.OUTGOING);
int count = 0;
for (Node node : traverser) {
count++;
}
long delta = System.currentTimeMillis() - start;
System.out.println(node count = + count + took + delta + ms);
}
private static void createGraph(EmbeddedGraphDatabase gdb, final Random
random) {
final Transaction tx = gdb.beginTx();
createNodes(gdb);
connectNodes(gdb, random);
tx.success();
tx.finish();
}
private static void connectNodes(EmbeddedGraphDatabase gdb, Random random) {
for (int i = 0; i INT; i++) {
final Node start = gdb.getNodeById(i);
for (int j = 0; j 20; j++) {
connectToOtherNodes(gdb, random, start);
}
}
}
private static void createNodes(EmbeddedGraphDatabase gdb) {
for (int i = 0; i INT; i++) {
gdb.createNode();
}
}
private static void connectToOtherNodes(EmbeddedGraphDatabase gdb, Random
random, Node start) {
Node end = gdb.getNodeById(random.nextInt(INT));
final Rels type = Rels.randomRel(random);
if (type.ordinal() % 2 == 0) {
start.createRelationshipTo(end, type);
} else {
end.createRelationshipTo(start, type);
}
}
}
Am 12.08.2011 um 02:55 schrieb ahmed.elsharkasy:
My graph contains 281 nodes with a total of 350 relationships . average
outgoing edges per node less than 10 and the same for in going edges
what do you think?
--
View this message in context:
http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247898.html
Sent from the Neo4j Community Discussions mailing list archive at Nabble.com.
Re: [Neo4j] cant use index after commit
i knew now what swallows the time , it is graphdb.shutdown i am calling after the travsersal , it took 500 millisecond to shutdown the db ??!!! -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3247993.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] cant use index after commit
This is system related or an issue in neo4j ? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cant-use-index-after-commit-tp3233038p3248019.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] some questions : unique property and Rest
1.Does Neo4J support *unique property* (Node/Relationship)? 2.How can I wrap a Node in a MyClass and using it with Rest services? 3.Can I use in MyClass some JPA annotaions? shlomib -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/some-questions-unique-property-and-Rest-tp3248352p3248352.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] java.lang.OutOfMemoryError: PermGen space
Howdy, We've started experiencing reasonably consistent java.lang.OutOfMemoryError exceptions. We're using neo4j-community-1.4.M04-windows.zip, running on Windows 7 x64 for development + Windows Azure for production. Graph access is exclusively via REST. We perform basic CRUD operations and Gremlin queries. The server spins up like so: 12/08/11 2:39:43 PM org.neo4j.server.NeoServerWithEmbeddedWebServer INFO: Starting Neo Server on port [5102] with [80] threads available 12/08/11 2:39:43 PM org.neo4j.server.database.Database INFO: Using database at C:\AzureTemp\neo4j-db 12/08/11 2:39:47 PM org.neo4j.server.modules.DiscoveryModule INFO: Mounted discovery module at [/] 12/08/11 2:39:48 PM org.neo4j.server.plugins.PluginManager INFO: Loaded server plugin CypherPlugin 12/08/11 2:39:48 PM org.neo4j.server.plugins.PluginManager INFO: Loaded server plugin GremlinPlugin 12/08/11 2:39:48 PM org.neo4j.server.modules.RESTApiModule INFO: Mounted REST API at [/db/data/] 12/08/11 2:39:48 PM org.neo4j.server.modules.ManagementApiModule INFO: Mounted management API at [/db/manage/] 12/08/11 2:39:48 PM org.neo4j.server.modules.WebAdminModule INFO: Mounted webadmin at [/webadmin] 12/08/11 2:39:48 PM org.neo4j.server.web.Jetty6WebServer INFO: Mounting static content at [/webadmin] from [webadmin-html] 12/08/11 2:39:50 PM org.neo4j.server.NeoServerWithEmbeddedWebServer INFO: Server started on [http://192.168.10.151:5102/] Then, after a relatively small number of queries (sub 500? still confirming more details), we get this: Exception in thread RMI RenewClean-[192.168.10.151:31174] java.lang.OutOfMemoryError: PermGen space Exception in thread Statistics Gatherer java.lang.OutOfMemoryError: PermGen space Java.exe is still running, and consuming around 180MB of RAM (with another 3GB of physical memory still available on the system). REST API returns 500s and the WebAdmin is unavailable. My questions: 1) Is this just that we've got a configuration setting wrong? In my very limited knowledge of Java, I know we can reconfigure the size, but this seems to indicate a potentially larger issue. 2) What should I do to gather more information to help diagnose this? -- Tatham Oddie au mob: +61 414 275 989, us cell: +1 415 598 8201, skype: tathamoddie If you're printing this email, you're doing it wrong. This is a computer, not a typewriter. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
