Hi,
I load my data using the following code :
public void createGraph() {
Map<String, String> config = new HashMap<String, String>();
config.put("cache_type", "none");
config.put("use_memory_mapped_buffers", "true");
config.put("neostore.nodestore.db.mapped_memory", "200M");
config.put("neostore.relationshipstore.db.mapped_memory", "1000M");
config.put("neostore.propertystore.db.mapped_memory", "250M");
config.put("neostore.propertystore.db.strings.mapped_memory", "250M");
inserter = BatchInserters.inserter("./data/neo4j", config);
long start = System.currentTimeMillis();
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(new
FileInputStream("./data/enronEdges.txt")));
String line;
int lineCounter = 1;
long srcNode, dstNode;
while((line = reader.readLine()) != null) {
if(lineCounter > 4) {
String[] parts = line.split("\t");
srcNode = getOrCreate(parts[0]);
dstNode = getOrCreate(parts[1]);
inserter.createRelationship(srcNode, dstNode, RelTypes.SIMILAR, null);
}
lineCounter++;
}
reader.close();
}
catch (IOException e) {
e.printStackTrace();
}
long time = System.currentTimeMillis() - start;
inserter.createDeferredSchemaIndex(NODE_LABEL).on("nodeId").create();
System.out.println("Loading time: " + time / 1000.0);
inserter.shutdown();
}
private long getOrCreate(String value) {
Long id = cache.get(Long.valueOf(value));
if(id == null) {
Map<String, Object> properties = MapUtil.map("nodeId", value);
id = inserter.createNode(properties, NODE_LABEL);
cache.put(Long.valueOf(value), id);
}
return id;
}
Then I am trying to retrieve the nodes with this code:
try(Transaction tx = gdb.beginTx()) {
Node n = gdb.findNodesByLabelAndProperty(NODE_LABEL, "nodeId", 1).iterator
().next();
System.out.println(n);
}
But I am getting the following error:
Exception in thread "main" java.util.NoSuchElementException: No more
elements in org.neo4j.collection.primitive.
PrimitiveLongCollections$5@6b3ab760
at org.neo4j.collection.primitive.
PrimitiveLongCollections$PrimitiveLongBaseIterator.next(
PrimitiveLongCollections.java:60)
at org.neo4j.collection.primitive.PrimitiveLongCollections$13.next(
PrimitiveLongCollections.java:712)
at org.neo4j.helpers.collection.ResourceClosingIterator.next(
ResourceClosingIterator.java:76)
at test.Neo4jBatchInsert.visitAllNodes(Neo4jBatchInsert.java:56)
at test.Neo4jBatchInsert.main(Neo4jBatchInsert.java:49)
Isn't this the proper way to get an indexed node? I use neo4j 2.1.3
embedded.
Thanks in advance,
Sotiris
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