Hello,
I'm doing a code to walk around all the nodes and get the node with the
maximum out degree. The main problem is that there are around 57 million
of nodes and 322 million of edges in the neo database, and using a 64 GB
RAM is insufficient to execute the program. It is the code:
Can anyone see what I'm doing wrong? I don't understand.
Thanks.
Mike
public static void getNodeMaxOutDegreeNeo(final NeoService neo,
final IndexService indexService) {
Node idNode;
long degree;
long maxDegree = 0;
IndexHits<Node> nodes;
long idDegree;
long idMaxDegree;
Transaction tx = neo.beginTx();
try {
nodes = indexService.getNodes("TYPE", "titles");
Iterator<Node> it = nodes.iterator();
Node idNodeMaxDegree=it.next();
Iterator<Relationship> relIterator =
idNodeMaxDegree.getRelationships(
NeoDataBase.MyRelationshipTypes.REF,
Direction.OUTGOING).iterator();
while (relIterator.hasNext()) {
relIterator.next();
maxDegree++;
}
long counter = 0;
while (it.hasNext()) {
if ( ++counter % 50000 == 0 ) {
tx.success();
tx.finish();
tx = neo.beginTx();
}
idNode = it.next();
relIterator =
idNode.getRelationships(NeoDataBase.MyRelationshipTypes.REF,
Direction.OUTGOING).iterator();
degree = 0;
while (relIterator.hasNext()) {
relIterator.next();
degree++;
}
if (degree >= maxDegree) {
if(degree==maxDegree) {
idDegree=
Long.getLong((String)idNode.getProperty("ID_TITLE"));
idMaxDegree=
Long.getLong((String)idNodeMaxDegree.getProperty("ID_TITLE"));
if(idDegree>idMaxDegree) {
idNodeMaxDegree = idNode;
}
}
else {
maxDegree = degree;
idNodeMaxDegree = idNode;
}
}
}
System.out.println("OId =
"+(String)idNodeMaxDegree.getProperty("ID_TITLE"));
System.out.println("Title =
"+(String)idNodeMaxDegree.getProperty("NAME"));
System.out.println("#refs = "+maxDegree);
tx.success();
}
finally
{
tx.finish();
}
}
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