Hi,
when I import a big data set in Neo4j database,the graph has
262111 vertices and 1234877 edges,eclipse has exception:Esception in
thread "GC-Monitor" java.lang.OutOfMemoryError:GC overhead limit exceeded
,my code is as folows:
System.out.println("从文件中把图数据到内存（用数组存放）...");
{
String line=null;
String[] arrs = null;
File file=new File(vertexPath);
BufferedReader bf = new BufferedReader(new FileReader(file));
int i=0;
while((line=bf.readLine())!=null){
vid[i++]=Integer.parseInt(line);
}
bf.close();
file=new File(path);
bf = new BufferedReader(new FileReader(file));
int count=0;
while((line=bf.readLine())!=null){
arrs=splitt(line);
int startId=Integer.parseInt(arrs[0]);
int endId=Integer.parseInt(arrs[1]);
edge[count][0]=startId;
edge[count][1]=endId;
++count ;
}
System.out.println("the num of edge is:"+count);
bf.close();
}
System.out.println("把图数据装载在neo4j数据库中...");
{
long startTime = 0, endTime = 0;
double buildTime = 0d;
startTime = System.nanoTime();
startDb();
Transaction tx = graphDb.beginTx();
try {
for(int i = 0; i < nv; i++) {
node[i] = graphDb.createNode();
node[i].setProperty("id", vid[i]);
}
int count=0;
for(int i=0;i<ne;++i){
int startId=edge[i][0];
int endId=edge[i][1];
int startIndex=locateVertexIndex(startId);
int endIndex=locateVertexIndex(endId);
Relationship rel =
node[startIndex].createRelationshipTo(node[endIndex], RelTypes.EDGE);
rel.setProperty("weight",1);
++count;
if(count%10000==0){
tx.success();
System.out.println("commit line:"+count);
}
}
if(count%10000!=0){
tx.success();
System.out.println("commit line:"+count);
}
} catch (Exception e) {
tx.failure();
}
finally {
tx.finish();
}
endTime = System.nanoTime();
buildTime = (double) (endTime - startTime) / (1e9);
System.out.println("the time of inserting nodes in Neo4j is锛氾細" +
buildTime);
}
I want to know the reason?
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