Re: [Neo] Neo4J Scalability

2009-09-10 Thread Todd Stavish 
Hi Johan,

Thanks! Quick summary, it was definitely a config issue. Changing to
the recommend config settings makes the exceptions go away. Weird
though, those config values are for VM memory management. But the
exceptions looked like file I/O issues. How does Neo4J get around the
OS max file size limitation, does it just overflow into a new file?

 I successfully ran the code resulting in roughly 190M nodes/properties
 and 390M relationships injected in 35min (the condition in one of your
 for loops probably has a typo, should have been personnumberOfPeople

Oh thanks, I thought that I was accessing a nodeID that didn't exist,
so I tried to go above the total number of nodes. I forgot to change
it back. Sorry.


 I first tried on my laptop but ran out of disk space (with a similar
 exception you got) since the full load requires 41GB of free space.
 Could you please try the injection again (using similar configuration
 and verifying you have enough disk space)?

I had enough disk space, 200GB+. I am still getting heap issues, I
don't have enough memory on my laptop, but I will run it on the cloud
later and they should go away.

 Also (maybe not important since this is just a test but) relationships
 can be treated as bi-directional/non directed using the enum constant
 Direction.BOTH, so the two relationships a-KNOWS-b  and b-KNOWS-a
 can be represented with one a-KNOWS-b.

This is just for traversals, no? You can't define it as bi-directional
on creation, can you?  I noticed that Neo doesn't explicitly define
cardinality (many-to-many, one-to-many, etc). Everything is supported
though. And the API is concise, which is prefereable.

Thanks again.

Regards,
Todd

 Regards,
 -Johan

 On Wed, Sep 9, 2009 at 3:11 AM, Todd Stavishtoddstav...@gmail.com wrote:
 He Johan,

 What OS do you run this on? The FileChannel.write fail with an
 exception saying buffer is too large is new to me.

 OSX. Snow Leopard.

 java -version
 java version 1.6.0_15
 Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219)
 Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode)

 I can try it on centos too. I was  going to try to run in it in EC2,
 but lost momentum and ideas to try.

 Try decrease the amount of memory you give the store files (if you
 have modified default configuration) and make sure you at least have
 disk space to write out 1/10th of the dedicated memory for each store
 file.

 Plenty of disk space. Do you mean pre-allocate the database file? How
 do you do that?

 I will run some tests on this code first thing in the morning to see
 if I can reproduce it.

 Thanks. I will send you the input files. And other code.

 Regards,
 Todd


 -Johan

 On Tue, Sep 8, 2009 at 5:45 PM, Todd Stavishtoddstav...@gmail.com wrote:
 Hello All,

 I hope that I haven't been too demanding of this list. I am pushing a
 tight deadline. I can't seem to get Neo4J to scale above 1.5 million
 nodes. The code is simple, just create a node, give it one property.
 Then go back and randomly create relationships. I moved to the
 BatchInserter too. Is there a way to use more than one DB? Is it a
 file size limitation? Can I commit incrementally somehow? I looked at
 the BatchInterter source, and there doesn't seem to be anything that I
 can do.

 Exceptions and demo code below.

 Thanks,
 Todd




 Created 1516633 nodes in 33 seconds

 Exception in thread main
 org.neo4j.impl.nioneo.store.StoreFailureException: Unable to write
 record[1419120] @[188742960]
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:111)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.force(AbstractPersistenceWindow.java:123)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.flushAll(PersistenceWindowPool.java:229)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.close(PersistenceWindowPool.java:203)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:503)
        at 
 org.neo4j.impl.nioneo.store.PropertyStore.closeStorage(PropertyStore.java:106)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.nioneo.store.NeoStore.closeStorage(NeoStore.java:81)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.batchinsert.BatchInserterImpl.shutdown(BatchInserterImpl.java:311)
        at 
 com.palantir.pathfind.GraphIngestBatch.main(GraphIngestBatch.java:78)
 Caused by: java.io.IOException: Result too large
        at sun.nio.ch.FileDispatcher.pwrite0(Native Method)
        at sun.nio.ch.FileDispatcher.pwrite(FileDispatcher.java:45)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:651)
        at

Re: [Neo] Neo4J Scalability

2009-09-10 Thread Johan Svensson 
On Thu, Sep 10, 2009 at 2:40 PM, Todd Stavish toddstav...@gmail.com wrote:
 Thanks! Quick summary, it was definitely a config issue. Changing to
 the recommend config settings makes the exceptions go away. Weird
 though, those config values are for VM memory management. But the
 exceptions looked like file I/O issues. How does Neo4J get around the
 OS max file size limitation, does it just overflow into a new file?


Yes, strange with that IOException instead of an OutOfMemory.

Neo4j does not overflow into a new file at the moment (this may be
implemented in Neo4j 2.0) but this has not been a problem since if you
have a large graph/data set they are typically deployed on a server
that can handle large files.

 I had enough disk space, 200GB+. I am still getting heap issues, I
 don't have enough memory on my laptop, but I will run it on the cloud
 later and they should go away.

May still be possible to get it to run on less memory but the time to
load the data will increase. For a 2G heap try:

neostore.nodestore.db.mapped_memory=800M
neostore.relationshipstore.db.mapped_memory=800M
neostore.propertystore.db.mapped_memory=100M
neostore.propertystore.db.index.mapped_memory=1M
neostore.propertystore.db.index.keys.mapped_memory=1M
neostore.propertystore.db.strings.mapped_memory=150M
neostore.propertystore.db.arrays.mapped_memory=1M

Regards,
-Johan
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Re: [Neo] Neo4J Scalability

2009-09-09 Thread Johan Svensson 
Todd,

I successfully ran the code resulting in roughly 190M nodes/properties
and 390M relationships injected in 35min (the condition in one of your
for loops probably has a typo, should have been personnumberOfPeople
and then more relationships would have been created).  This was on a
Linux machine with 8G RAM running with a 5G heap and the following
configuration:

neostore.nodestore.db.mapped_memory=1700M
neostore.relationshipstore.db.mapped_memory=2000M
neostore.propertystore.db.mapped_memory=100M
neostore.propertystore.db.index.mapped_memory=1M
neostore.propertystore.db.index.keys.mapped_memory=1M
neostore.propertystore.db.strings.mapped_memory=250M
neostore.propertystore.db.arrays.mapped_memory=130M

I first tried on my laptop but ran out of disk space (with a similar
exception you got) since the full load requires 41GB of free space.
Could you please try the injection again (using similar configuration
and verifying you have enough disk space)?

Also (maybe not important since this is just a test but) relationships
can be treated as bi-directional/non directed using the enum constant
Direction.BOTH, so the two relationships a-KNOWS-b  and b-KNOWS-a
can be represented with one a-KNOWS-b.

Regards,
-Johan

On Wed, Sep 9, 2009 at 3:11 AM, Todd Stavishtoddstav...@gmail.com wrote:
 He Johan,

 What OS do you run this on? The FileChannel.write fail with an
 exception saying buffer is too large is new to me.

 OSX. Snow Leopard.

 java -version
 java version 1.6.0_15
 Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219)
 Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode)

 I can try it on centos too. I was  going to try to run in it in EC2,
 but lost momentum and ideas to try.

 Try decrease the amount of memory you give the store files (if you
 have modified default configuration) and make sure you at least have
 disk space to write out 1/10th of the dedicated memory for each store
 file.

 Plenty of disk space. Do you mean pre-allocate the database file? How
 do you do that?

 I will run some tests on this code first thing in the morning to see
 if I can reproduce it.

 Thanks. I will send you the input files. And other code.

 Regards,
 Todd


 -Johan

 On Tue, Sep 8, 2009 at 5:45 PM, Todd Stavishtoddstav...@gmail.com wrote:
 Hello All,

 I hope that I haven't been too demanding of this list. I am pushing a
 tight deadline. I can't seem to get Neo4J to scale above 1.5 million
 nodes. The code is simple, just create a node, give it one property.
 Then go back and randomly create relationships. I moved to the
 BatchInserter too. Is there a way to use more than one DB? Is it a
 file size limitation? Can I commit incrementally somehow? I looked at
 the BatchInterter source, and there doesn't seem to be anything that I
 can do.

 Exceptions and demo code below.

 Thanks,
 Todd




 Created 1516633 nodes in 33 seconds

 Exception in thread main
 org.neo4j.impl.nioneo.store.StoreFailureException: Unable to write
 record[1419120] @[188742960]
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:111)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.force(AbstractPersistenceWindow.java:123)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.flushAll(PersistenceWindowPool.java:229)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.close(PersistenceWindowPool.java:203)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:503)
        at 
 org.neo4j.impl.nioneo.store.PropertyStore.closeStorage(PropertyStore.java:106)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.nioneo.store.NeoStore.closeStorage(NeoStore.java:81)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.batchinsert.BatchInserterImpl.shutdown(BatchInserterImpl.java:311)
        at 
 com.palantir.pathfind.GraphIngestBatch.main(GraphIngestBatch.java:78)
 Caused by: java.io.IOException: Result too large
        at sun.nio.ch.FileDispatcher.pwrite0(Native Method)
        at sun.nio.ch.FileDispatcher.pwrite(FileDispatcher.java:45)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:651)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:105)


 public class GraphIngestBatch
 {

        public static void main(String[] args)
        {
                try
                {

                        // Create graph database service
                        BatchInserter neo = new BatchInserterImpl(graphDB/,
 BatchInserterImpl.loadProperties(neo.props));

                        // Read raw text for name data
                        FileReader namesFile = new

[Neo] Neo4J Scalability

2009-09-08 Thread Todd Stavish 
Hello All,

I hope that I haven't been too demanding of this list. I am pushing a
tight deadline. I can't seem to get Neo4J to scale above 1.5 million
nodes. The code is simple, just create a node, give it one property.
Then go back and randomly create relationships. I moved to the
BatchInserter too. Is there a way to use more than one DB? Is it a
file size limitation? Can I commit incrementally somehow? I looked at
the BatchInterter source, and there doesn't seem to be anything that I
can do.

Exceptions and demo code below.

Thanks,
Todd




Created 1516633 nodes in 33 seconds

Exception in thread main
org.neo4j.impl.nioneo.store.StoreFailureException: Unable to write
record[1419120] @[188742960]
at 
org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:111)
at 
org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.force(AbstractPersistenceWindow.java:123)
at 
org.neo4j.impl.nioneo.store.PersistenceWindowPool.flushAll(PersistenceWindowPool.java:229)
at 
org.neo4j.impl.nioneo.store.PersistenceWindowPool.close(PersistenceWindowPool.java:203)
at 
org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:503)
at 
org.neo4j.impl.nioneo.store.PropertyStore.closeStorage(PropertyStore.java:106)
at 
org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
at org.neo4j.impl.nioneo.store.NeoStore.closeStorage(NeoStore.java:81)
at 
org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
at 
org.neo4j.impl.batchinsert.BatchInserterImpl.shutdown(BatchInserterImpl.java:311)
at com.palantir.pathfind.GraphIngestBatch.main(GraphIngestBatch.java:78)
Caused by: java.io.IOException: Result too large
at sun.nio.ch.FileDispatcher.pwrite0(Native Method)
at sun.nio.ch.FileDispatcher.pwrite(FileDispatcher.java:45)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
at sun.nio.ch.IOUtil.write(IOUtil.java:75)
at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:651)
at 
org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:105)


public class GraphIngestBatch
{

public static void main(String[] args)
{
try
{

// Create graph database service
BatchInserter neo = new BatchInserterImpl(graphDB/,
BatchInserterImpl.loadProperties(neo.props));

// Read raw text for name data
FileReader namesFile = new
FileReader(/Users/todd/Code/pathfind/target/classes/rawData/lastNames.txt);
BufferedReader namesBuffer = new 
BufferedReader(namesFile);
String name;

// Start timer and counter
Stopwatch timer = new Stopwatch();
timer.start();
long numberOfPeople = 1;

// Initialize root node
long person, neighbor;
MapString,Object properties = new 
HashMapString,Object();
properties.put(name, Philberto Anderossono);
neighbor = neo.createNode(properties);
neo.createRelationship(neighbor, 0,
DynamicRelationshipType.withName(ROOT), null);

// Create people and neighbor relationships
while ((name = namesBuffer.readLine()) != null)
{
properties.put(name, name);
person = neo.createNode(properties);

neo.createRelationship(person, neighbor,
DynamicRelationshipType.withName(KNOWS), null);
neo.createRelationship(neighbor, person,
DynamicRelationshipType.withName(KNOWS), null);

neighbor = person;
numberOfPeople++;
}
namesBuffer.close();
namesFile.close();

System.out.println(Number of people is:  + 
numberOfPeople);

// Randomly generate relationships (minimum four per 
person + both
neighbors, mean ten relationships / person)
Long friend;
int numberOfFriends = 1;
for (person=1; personnumberOfPeople; person++)
{
for (int i=0; inumberOfFriends; i++)

Re: [Neo] Neo4J Scalability

2009-09-08 Thread Johan Svensson 
Hi Todd,

What OS do you run this on? The FileChannel.write fail with an
exception saying buffer is too large is new to me.

Try decrease the amount of memory you give the store files (if you
have modified default configuration) and make sure you at least have
disk space to write out 1/10th of the dedicated memory for each store
file.

I will run some tests on this code first thing in the morning to see
if I can reproduce it.

-Johan

On Tue, Sep 8, 2009 at 5:45 PM, Todd Stavishtoddstav...@gmail.com wrote:
 Hello All,

 I hope that I haven't been too demanding of this list. I am pushing a
 tight deadline. I can't seem to get Neo4J to scale above 1.5 million
 nodes. The code is simple, just create a node, give it one property.
 Then go back and randomly create relationships. I moved to the
 BatchInserter too. Is there a way to use more than one DB? Is it a
 file size limitation? Can I commit incrementally somehow? I looked at
 the BatchInterter source, and there doesn't seem to be anything that I
 can do.

 Exceptions and demo code below.

 Thanks,
 Todd




 Created 1516633 nodes in 33 seconds

 Exception in thread main
 org.neo4j.impl.nioneo.store.StoreFailureException: Unable to write
 record[1419120] @[188742960]
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:111)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.force(AbstractPersistenceWindow.java:123)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.flushAll(PersistenceWindowPool.java:229)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.close(PersistenceWindowPool.java:203)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:503)
        at 
 org.neo4j.impl.nioneo.store.PropertyStore.closeStorage(PropertyStore.java:106)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at org.neo4j.impl.nioneo.store.NeoStore.closeStorage(NeoStore.java:81)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.batchinsert.BatchInserterImpl.shutdown(BatchInserterImpl.java:311)
        at 
 com.palantir.pathfind.GraphIngestBatch.main(GraphIngestBatch.java:78)
 Caused by: java.io.IOException: Result too large
        at sun.nio.ch.FileDispatcher.pwrite0(Native Method)
        at sun.nio.ch.FileDispatcher.pwrite(FileDispatcher.java:45)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:651)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:105)


 public class GraphIngestBatch
 {

        public static void main(String[] args)
        {
                try
                {

                        // Create graph database service
                        BatchInserter neo = new BatchInserterImpl(graphDB/,
 BatchInserterImpl.loadProperties(neo.props));

                        // Read raw text for name data
                        FileReader namesFile = new
 FileReader(/Users/todd/Code/pathfind/target/classes/rawData/lastNames.txt);
                        BufferedReader namesBuffer = new 
 BufferedReader(namesFile);
                        String name;

                // Start timer and counter
                Stopwatch timer = new Stopwatch();
                timer.start();
                        long numberOfPeople = 1;

                        // Initialize root node
                        long person, neighbor;
                        MapString,Object properties = new 
 HashMapString,Object();
                        properties.put(name, Philberto Anderossono);
                        neighbor = neo.createNode(properties);
                        neo.createRelationship(neighbor, 0,
 DynamicRelationshipType.withName(ROOT), null);

                        // Create people and neighbor relationships
                        while ((name = namesBuffer.readLine()) != null)
                        {
                                properties.put(name, name);
                                person = neo.createNode(properties);

                                neo.createRelationship(person, neighbor,
 DynamicRelationshipType.withName(KNOWS), null);
                                neo.createRelationship(neighbor, person,
 DynamicRelationshipType.withName(KNOWS), null);

                                neighbor = person;
                                numberOfPeople++;
                        }
                        namesBuffer.close();
                        namesFile.close();

                        System.out.println(Number of people is:  + 
 numberOfPeople);

                        // Randomly generate relationships (minimum four per 
 person + both
 neighbors, mean ten relationships / person)
                    

Re: [Neo] Neo4J Scalability

2009-09-08 Thread Todd Stavish 
He Johan,

 What OS do you run this on? The FileChannel.write fail with an
 exception saying buffer is too large is new to me.

OSX. Snow Leopard.

java -version
java version 1.6.0_15
Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode)

I can try it on centos too. I was  going to try to run in it in EC2,
but lost momentum and ideas to try.

 Try decrease the amount of memory you give the store files (if you
 have modified default configuration) and make sure you at least have
 disk space to write out 1/10th of the dedicated memory for each store
 file.

Plenty of disk space. Do you mean pre-allocate the database file? How
do you do that?

 I will run some tests on this code first thing in the morning to see
 if I can reproduce it.

Thanks. I will send you the input files. And other code.

Regards,
Todd


 -Johan

 On Tue, Sep 8, 2009 at 5:45 PM, Todd Stavishtoddstav...@gmail.com wrote:
 Hello All,

 I hope that I haven't been too demanding of this list. I am pushing a
 tight deadline. I can't seem to get Neo4J to scale above 1.5 million
 nodes. The code is simple, just create a node, give it one property.
 Then go back and randomly create relationships. I moved to the
 BatchInserter too. Is there a way to use more than one DB? Is it a
 file size limitation? Can I commit incrementally somehow? I looked at
 the BatchInterter source, and there doesn't seem to be anything that I
 can do.

 Exceptions and demo code below.

 Thanks,
 Todd




 Created 1516633 nodes in 33 seconds

 Exception in thread main
 org.neo4j.impl.nioneo.store.StoreFailureException: Unable to write
 record[1419120] @[188742960]
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:111)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.force(AbstractPersistenceWindow.java:123)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.flushAll(PersistenceWindowPool.java:229)
        at 
 org.neo4j.impl.nioneo.store.PersistenceWindowPool.close(PersistenceWindowPool.java:203)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:503)
        at 
 org.neo4j.impl.nioneo.store.PropertyStore.closeStorage(PropertyStore.java:106)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at org.neo4j.impl.nioneo.store.NeoStore.closeStorage(NeoStore.java:81)
        at 
 org.neo4j.impl.nioneo.store.CommonAbstractStore.close(CommonAbstractStore.java:500)
        at 
 org.neo4j.impl.batchinsert.BatchInserterImpl.shutdown(BatchInserterImpl.java:311)
        at 
 com.palantir.pathfind.GraphIngestBatch.main(GraphIngestBatch.java:78)
 Caused by: java.io.IOException: Result too large
        at sun.nio.ch.FileDispatcher.pwrite0(Native Method)
        at sun.nio.ch.FileDispatcher.pwrite(FileDispatcher.java:45)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:651)
        at 
 org.neo4j.impl.nioneo.store.AbstractPersistenceWindow.writeOut(AbstractPersistenceWindow.java:105)


 public class GraphIngestBatch
 {

        public static void main(String[] args)
        {
                try
                {

                        // Create graph database service
                        BatchInserter neo = new BatchInserterImpl(graphDB/,
 BatchInserterImpl.loadProperties(neo.props));

                        // Read raw text for name data
                        FileReader namesFile = new
 FileReader(/Users/todd/Code/pathfind/target/classes/rawData/lastNames.txt);
                        BufferedReader namesBuffer = new 
 BufferedReader(namesFile);
                        String name;

                // Start timer and counter
                Stopwatch timer = new Stopwatch();
                timer.start();
                        long numberOfPeople = 1;

                        // Initialize root node
                        long person, neighbor;
                        MapString,Object properties = new 
 HashMapString,Object();
                        properties.put(name, Philberto Anderossono);
                        neighbor = neo.createNode(properties);
                        neo.createRelationship(neighbor, 0,
 DynamicRelationshipType.withName(ROOT), null);

                        // Create people and neighbor relationships
                        while ((name = namesBuffer.readLine()) != null)
                        {
                                properties.put(name, name);
                                person = neo.createNode(properties);

                                neo.createRelationship(person, neighbor,
 DynamicRelationshipType.withName(KNOWS), null);
                                neo.createRelationship(neighbor, person,
 DynamicRelationshipType.withName(KNOWS), null);