if i choose this value keep_logical_logs to false is the same as this Transaction tx = ((GraphDatabaseAPI)neo4jGraph).tx().unforced().begin(); ? Τη Δευτέρα, 3 Φεβρουαρίου 2014 6:41:18 μ.μ. UTC+2, ο χρήστης Michael Hunger έγραψε:
> Why do you do individual inserts when you have blocks of data? > > You can often aggregate events on the application level to be inserted as > a bigger batch. > see: http://maxdemarzi.com/2013/09/05/scaling-writes/ > > Otherwise you can also release the force-write-to-log constraint and use > > Transaction tx = ((GraphDatabaseAPI)neo4jGraph).tx().unforced().begin(); > > Instead of neo4jGraph.beginTx(); > > > Am 03.02.2014 um 15:40 schrieb Sotiris Beis <[email protected]<javascript:> > >: > > In addition to my previous question is there any suggestion to improve the > performance of the following code. I use this to simulate the needed time > to create a graph if the graph is created by single insertions > (incrementally not batch). So I commit every transaction and I measure the > time that a block needs to be inserted. A block consists of a 1,000 nodes > and their edges. Here is the code: > > import java.io.BufferedReader; > import java.io.FileInputStream; > import java.io.IOException; > import java.io.InputStreamReader; > import java.util.ArrayList; > import java.util.List; > > import org.neo4j.graphdb.GraphDatabaseService; > import org.neo4j.graphdb.Node; > import org.neo4j.graphdb.RelationshipType; > import org.neo4j.graphdb.Transaction; > import org.neo4j.graphdb.factory.GraphDatabaseFactory; > import org.neo4j.graphdb.factory.GraphDatabaseSetting; > import org.neo4j.graphdb.index.Index; > > public class Neo4jSingleInsertion implements Insertion { > > public static String INSERTION_TIMES_OUTPUT_PATH = > "data/neo4j.insertion.times"; > > private static int count; > > private GraphDatabaseService neo4jGraph = null; > private Index<Node> nodeIndex = null; > > private static enum RelTypes implements RelationshipType { > SIMILAR > } > > public static void main(String args[]) { > Neo4jSingleInsertion test = new Neo4jSingleInsertion(); > test.startup("data/neo4j"); > test.createGraph("data/enronEdges.txt"); > test.shutdown(); > } > > public void startup(String neo4jDBDir) { > System.out.println("The Neo4j database is now starting . . . ."); > neo4jGraph = new GraphDatabaseFactory().newEmbeddedDatabase( > neo4jDBDir); > nodeIndex = neo4jGraph.index().forNodes("nodes"); > } > > public void shutdown() { > System.out.println("The Neo4j database is now shuting down . . . > ."); > if(neo4jGraph != null) { > neo4jGraph.shutdown(); > nodeIndex = null; > } > } > > public void createGraph(String datasetDir) { > count++; > System.out.println("Incrementally creating the Neo4j database . . > . ."); > List<Double> insertionTimes = new ArrayList<Double>(); > try { > BufferedReader reader = new BufferedReader(new > InputStreamReader(new FileInputStream(datasetDir))); > String line; > int nodesCounter = 0; > int lineCounter = 1; > Transaction tx = null; > long start = System.currentTimeMillis(); > long duration; > while((line = reader.readLine()) != null) { > if(lineCounter > 4) { > String[] parts = line.split("\t"); > > Node srcNode = nodeIndex.get("nodeId", parts[0]). > getSingle(); > if(srcNode == null) { > tx = neo4jGraph.beginTx(); > srcNode = neo4jGraph.createNode(); > srcNode.setProperty("nodeId", parts[0]); > nodeIndex.add(srcNode, "nodeId", parts[0]); > tx.success(); > tx.finish(); > nodesCounter++; > } > > if(nodesCounter == 1000) { > duration = System.currentTimeMillis() - start; > insertionTimes.add((double) duration); > nodesCounter = 0; > start = System.currentTimeMillis(); > } > > Node dstNode = nodeIndex.get("nodeId", parts[1]). > getSingle(); > if(dstNode == null) { > tx = neo4jGraph.beginTx(); > dstNode = neo4jGraph.createNode(); > dstNode.setProperty("nodeId", parts[1]); > nodeIndex.add(dstNode, "nodeId", parts[1]); > tx.success(); > tx.finish(); > nodesCounter++; > } > > tx = neo4jGraph.beginTx(); > srcNode.createRelationshipTo(dstNode, RelTypes.SIMILAR > ); > tx.success(); > tx.finish(); > > if(nodesCounter == 1000) { > duration = System.currentTimeMillis() - start; > insertionTimes.add((double) duration); > nodesCounter = 0; > start = System.currentTimeMillis(); > } > } > lineCounter++; > } > duration = System.currentTimeMillis() - start; > insertionTimes.add((double) duration); > reader.close(); > } > catch (IOException e) { > e.printStackTrace(); > } > Utils utils = new Utils(); > utils.writeTimes(insertionTimes, Neo4jSingleInsertion. > INSERTION_TIMES_OUTPUT_PATH+"."+count); > } > > } > > Thanks, > Sotiris > > -- > 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 [email protected] <javascript:>. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
