[Neo4j] Achim retweeted a nice edge weight visualization

2011-05-12 Thread Michael Hunger
Looks really good, especially the last, interactive one.

http://worrydream.com/VisualizingEdgeWeights/

Cheers

Michael

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Re: [Neo4j] finding all shortest paths between one node and all other nodes in a large scale databse

2011-05-12 Thread Mattias Persson
Yes, you can probably do this thing in one traversal. Shortest path will
give you the shortest path(s) between two given nodes, but are interested in
any path, right? And you can find paths to several different end nodes in
one traversal. Just specify an Evaluator which knows about that, or let
loose a breadth-first traversal and filter your paths afterwards.

2011/5/11 Michael Hunger michael.hun...@neotechnology.com

 Hey JueiTing,

 I'm not sure if Hadoop is needed here.
 What is the current performance characteristics for the shortest path you
 are using?

 You could take a decent machine and just fire up, e.g. blocks of 10k node
 pairs to a ThreadPoolExecutor with cores*2 threads.
 Each of those tasks only has to return the sum of the path lengths (and you
 know the block size) so you can sum the whole thing up onto a long and
 divide it by the
 number of pairs processed at the end?

 Perhaps instead of brute force looping one and a half times over all nodes
 it is perhaps better to do a breath first traversal over all nodes
 (regardless of relationships, just outgoing rels) and returning unique paths
 from the traverser
 and calculating the path lenghts from the start nodes to each _connected_
 node on the paths (start node - path[0..n].nodes[1..n])

 Cheers

 Michael

 Am 11.05.2011 um 21:12 schrieb Peter Neubauer:

  Hi JueiTing,
  I think this is a typical case for a massive Map/Reduce job. I am
 thinking
  of combining Hadoop works with replicas of the graph and then do the
  computation. I believe Paddy Fitzgerald has been working with these
  approaches and can give some feedback.
 
  Of course, given the size of the graph, that might prove a problem. OTOH,
 if
  there are no modifications during the computation, you could run the
  calculations on read-only databases from the same store. Would that work?
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
 database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
  On Wed, May 11, 2011 at 12:47 AM, 翁瑞廷 wshir...@gmail.com wrote:
 
  Hi,
 
  I'm trying to use Neo4j graph database to store a
  large social network(more than 5,000,000 nodes) for academic research.
 
  I need to compute the separation degree(path length) between any two
 nodes
  in the graph then get the average degree of whole database.
  The solution I'm using use now is archieved by executing API
  GraphAlgoFactory.shortestPath,
  but it means I need to execute (n*(n-1))/2 times to get all path length.
 I
  don't think it's a very good idea :(
 
  So, I'm wondering that is there any function which can assign one node
 and
  whole DB as Input, and return the
  paths or only path lengths between the node and all other nodes in the
  graph
  as Output? Just like Dijkstra algorithm did.
  I know there is a Dijkstra function in the API, but it only return the
 path
  between two nodes.
  It'll be really helpful for me if there is any function can return all
 the
  result in one computation(even the whole result array computing by
  Dijkstra)
 
  Or does anyone has better idea to deal with this issue?
  I tried to implement Dijkstra by myself, but it was impossible to
 declare
  such big 2D array in the program...(OutOfMemoryException)
 
  If there is any advice, I'll really appreciate it.
 
  Thanks.
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Re: [Neo4j] finding all shortest paths between one node and all other nodes in a large scale databse

2011-05-12 Thread 翁瑞廷
Thanks for all your response,

Here is the size of the grapth db:

NodesSize
-
100,000  97MB
200,000  182MB
300,000  267MB
...
5,000,000   expect 5GB

I've tried to use 5 virtual machines, each one has 2 cores and 1G memory,
Running 2 threads on each VM.

Nodes   Time
--
50,000  20mins
150,00040hrs

Obviously, when the amount of node increases, the spending time of executing
GraphAlgoFactory.shortestPath increases heavily and non-linearly.
It's hard to estimate how many machines I need if I want to deal with
5,000,000 nodes or even 10,000,000,
I think Map/Reduce will be one solution for me, and I'll try to use BFS
traversal which may reduce some duplicate procedures.


Nice to discuss with you,

Thanks.

2011/5/12 Michael Hunger michael.hun...@neotechnology.com

 Hey JueiTing,

 I'm not sure if Hadoop is needed here.
 What is the current performance characteristics for the shortest path you
 are using?

 You could take a decent machine and just fire up, e.g. blocks of 10k node
 pairs to a ThreadPoolExecutor with cores*2 threads.
 Each of those tasks only has to return the sum of the path lengths (and you
 know the block size) so you can sum the whole thing up onto a long and
 divide it by the
 number of pairs processed at the end?

 Perhaps instead of brute force looping one and a half times over all nodes
 it is perhaps better to do a breath first traversal over all nodes
 (regardless of relationships, just outgoing rels) and returning unique paths
 from the traverser
 and calculating the path lenghts from the start nodes to each _connected_
 node on the paths (start node - path[0..n].nodes[1..n])

 Cheers

 Michael

 Am 11.05.2011 um 21:12 schrieb Peter Neubauer:

  Hi JueiTing,
  I think this is a typical case for a massive Map/Reduce job. I am
 thinking
  of combining Hadoop works with replicas of the graph and then do the
  computation. I believe Paddy Fitzgerald has been working with these
  approaches and can give some feedback.
 
  Of course, given the size of the graph, that might prove a problem. OTOH,
 if
  there are no modifications during the computation, you could run the
  calculations on read-only databases from the same store. Would that work?
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
 database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
  On Wed, May 11, 2011 at 12:47 AM, 翁瑞廷 wshir...@gmail.com wrote:
 
  Hi,
 
  I'm trying to use Neo4j graph database to store a
  large social network(more than 5,000,000 nodes) for academic research.
 
  I need to compute the separation degree(path length) between any two
 nodes
  in the graph then get the average degree of whole database.
  The solution I'm using use now is archieved by executing API
  GraphAlgoFactory.shortestPath,
  but it means I need to execute (n*(n-1))/2 times to get all path length.
 I
  don't think it's a very good idea :(
 
  So, I'm wondering that is there any function which can assign one node
 and
  whole DB as Input, and return the
  paths or only path lengths between the node and all other nodes in the
  graph
  as Output? Just like Dijkstra algorithm did.
  I know there is a Dijkstra function in the API, but it only return the
 path
  between two nodes.
  It'll be really helpful for me if there is any function can return all
 the
  result in one computation(even the whole result array computing by
  Dijkstra)
 
  Or does anyone has better idea to deal with this issue?
  I tried to implement Dijkstra by myself, but it was impossible to
 declare
  such big 2D array in the program...(OutOfMemoryException)
 
  If there is any advice, I'll really appreciate it.
 
  Thanks.
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Re: [Neo4j] Index Framework - Query Question

2011-05-12 Thread Mattias Persson
Could you perhaps create an index with a custom Analyzer which treats titles
as fulltext and others as non-analyzed?

2011/5/11 Rick Bullotta rick.bullo...@thingworx.com

 Is there currently any way to have a composite index consisting of fulltext
 and non-analyzed (simple fields), and to query them in a single query
 statement?  e.g. :  title:Reloaded AND year:1999

 In this case, I'd be using a Lucene Analyzer on the title, but indexing the
 primitive types without using the analyzer/norms/etc...I know how to do it
 with Lucene directly, but not clear if it can be done w/Neo4J.

 Thanks!

 Rick

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Re: [Neo4j] Retrieving a node linked to the reference node takes forever

2011-05-12 Thread Mattias Persson
2011/5/11 Pablo Pareja ppar...@era7.com

 Hi,

 I just tested the same code with ~ 50.000 nodes in the DB and it works just
 fine.
 Why should it be different for scenarios with many more nodes?

 Actually, even though there are millions of nodes they are not directly
 related at all with the
 one where the program gets stuck. In fact there only are ~ 50 nodes linked
 to the reference
 node and at that point there isn't any other relationship liked to that
 node.


Sounds weird. How much heap have you given your JVM? Have you supplied
custom memory-mapping settings to neo4j?


 I was wondering, could it be possible that the cause of this issue would be
 trying to get the node id (long value) ?
 How's that implemented?
 Could there be any performance issues in the case of retrieving the id of a
 node whenever there are already
 a lot of nodes in the DB?


Retreiving a node, if in the cache is in essence a HashMap lookup. If it
needs to be loaded its an O(1) operation since the id tells neo4j the exact
location in the nodestore file to get it from. So no matter how many nodes
there are in the database a getNodeById is always O(1)... apart from that
the file system/OS doesn't have that part of the file cached a.t.m. and by
then if will be slower of course.


 Cheers,

 Pablo Pareja

 On Tue, May 10, 2011 at 11:54 AM, Pablo Pareja ppar...@era7.com wrote:

  Hi,
 
  I don't want to bother you all but are there any news/insights about
 this?
  Don't hesitate to tell me any other test I can carry out so that we can
 get
  more information
  about what could be going on.
  Cheers,
 
  Pablo Pareja
 
 
  On Mon, May 9, 2011 at 12:34 PM, Pablo Pareja ppar...@era7.com wrote:
 
  Ok, I'm running iostat command and this is what I'm getting so far:
 
  *(First results)*
 
  avg-cpu:  %user   %nice %system %iowait  %steal   %idle
 0.050.000.030.420.30   99.20
 
  Device:tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
  xvdap11.8964.9814.25 161562  35424
  xvdg  8.7096.3821.01 239634  52232
 
  *(After ~ 10 minutes with the program stuck)*
 
  Linux 2.6.35.11-83.9.amzn1.x86_64 (ip-10-230-37-212)09/05/11
   _x86_64_(4 CPU)
 
  avg-cpu:  %user   %nice %system %iowait  %steal   %idle
 0.070.050.213.020.26   96.39
 
  Device:tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
  xvdap13.8380.9515.04 227594  42280
  xvdg107.06   880.5118.582475482  52232
 
 
 
  On Mon, May 9, 2011 at 10:17 AM, Mattias Persson 
  matt...@neotechnology.com wrote:
 
  So I'm assuming there's a high I/O load when this happens? It seems to
 be
  loading up one or more persistence windows (a part of the database)
 into
  memory. Could you verify that high I/O load with the iostat command
 (if
  you're on linux) or any process/system monitor?
 
  2011/5/6 Pablo Pareja ppar...@era7.com
 
   There you go:
  
   Full thread dump Java HotSpot(TM) 64-Bit Server VM (19.0-b09 mixed
  mode):
  
   Low Memory Detector daemon prio=10 tid=0x7fa5ac0b7000 nid=0x526
   runnable [0x]
 java.lang.Thread.State: RUNNABLE
  
   CompilerThread1 daemon prio=10 tid=0x7fa5ac0b5000 nid=0x525
  waiting
   on
   condition [0x]
 java.lang.Thread.State: RUNNABLE
  
   CompilerThread0 daemon prio=10 tid=0x7fa5ac0b2000 nid=0x524
  waiting
   on
   condition
  
java.lang.Thread.State: RUNNABLE
  
   Signal Dispatcher daemon prio=10 tid=0x7fa5ac0b nid=0x523
  waiting
   on condition [0x]
 java.lang.Thread.State: RUNNABLE
  
   Finalizer daemon prio=10 tid=0x7fa5ac091800 nid=0x522 in
   Object.wait()
   [0x7fa5a20a2000]
 java.lang.Thread.State: WAITING (on object monitor)
  at java.lang.Object.wait(Native Method)
  - waiting on 0x000103b4afb0 (a
   java.lang.ref.ReferenceQueue$Lock)
  at
 java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
  - locked 0x000103b4afb0 (a
  java.lang.ref.ReferenceQueue$Lock)
   [ec2-user@ip-10-230-55-104 bio4j_volume]$   at
   java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
  at
  java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
  
   Reference Handler daemon prio=10 tid=0x7fa5ac08f800 nid=0x521
 in
   Object.wait() [0x7fa5a21a3000]
 java.lang.Thread.State: WAITING (on object monitor)
  at java.lang.Object.wait(Native Method)
  - waiting on 0x000103b4af48 (a
  java.lang.ref.Reference$Lock)
  at java.lang.Object.wait(Object.java:485)
  at
  java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
  - locked 0x000103b4af48 (a java.lang.ref.Reference$Lock)
  
   main prio=10 tid=0x7fa5ac007000 nid=0x51b runnable
   [0x7fa5b06cd000]
 

[Neo4j] Error while creating EXE from JAR and Runnable JAR

2011-05-12 Thread Abhishek AS
Was creating an exe by exporting JAR and Runnable JARs thro eclipse..
Using Launch4j to do that. and having proper manifest files with the class
path too.. But i get the following error when i try to run the created exe
file.
Caused by:
java.Lang.
ClassNotFoundException: org.neo4j.graphdb.GraphDatabaseService
at java.net.URLClassLoader$1.run
at java.security.AccessController.doPrivileged
at java.net.URLClassLoader.findClass
at java.Land.ClassLoader.loadClass
at sun.misc.Launcher$AppClassLoader.loadClass
at java.Lang.ClassLoader.loadClass

Could not find the main class: package name.Class name
 is there a solution to this.??
i had actually created an exe earlier which was working perfectly fine..
Plz help!

Thanks.
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Re: [Neo4j] Error while creating EXE from JAR and Runnable JAR

2011-05-12 Thread Mattias Persson
Could you supply how your generated classpath looks like?

2011/5/12 Abhishek AS abhishek@gmail.com

 Was creating an exe by exporting JAR and Runnable JARs thro eclipse..
 Using Launch4j to do that. and having proper manifest files with the class
 path too.. But i get the following error when i try to run the created exe
 file.
 Caused by:
 java.Lang.
 ClassNotFoundException: org.neo4j.graphdb.GraphDatabaseService
 at java.net.URLClassLoader$1.run
 at java.security.AccessController.doPrivileged
 at java.net.URLClassLoader.findClass
 at java.Land.ClassLoader.loadClass
 at sun.misc.Launcher$AppClassLoader.loadClass
 at java.Lang.ClassLoader.loadClass

 Could not find the main class: package name.Class name
  is there a solution to this.??
 i had actually created an exe earlier which was working perfectly fine..
 Plz help!

 Thanks.
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Re: [Neo4j] User Digest, Vol 50, Issue 44

2011-05-12 Thread Abhishek AS
The classpath seems to be just a dot under the class path label.


 Message: 4
 Date: Thu, 12 May 2011 11:02:30 +0200
 From: Mattias Persson matt...@neotechnology.com
 Subject: Re: [Neo4j] Error while creating EXE from JAR and Runnable
JAR
 To: Neo4j user discussions user@lists.neo4j.org
 Message-ID: BANLkTik8Xry8bj4eJ_Y=nhd3umdc07f...@mail.gmail.com
 Content-Type: text/plain; charset=UTF-8

 Could you supply how your generated classpath looks like?

 2011/5/12 Abhishek AS abhishek@gmail.com

  Was creating an exe by exporting JAR and Runnable JARs thro eclipse..
  Using Launch4j to do that. and having proper manifest files with the
 class
  path too.. But i get the following error when i try to run the created
 exe
  file.
  Caused by:
  java.Lang.
  ClassNotFoundException: org.neo4j.graphdb.GraphDatabaseService
  at java.net.URLClassLoader$1.run
  at java.security.AccessController.doPrivileged
  at java.net.URLClassLoader.findClass
  at java.Land.ClassLoader.loadClass
  at sun.misc.Launcher$AppClassLoader.loadClass
  at java.Lang.ClassLoader.loadClass
 
  Could not find the main class: package name.Class name
   is there a solution to this.??
  i had actually created an exe earlier which was working perfectly fine..
  Plz help!
 
  Thanks.
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 End of User Digest, Vol 50, Issue 44
 

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Re: [Neo4j] finding all shortest paths between one node and all other nodes in a large scale databse

2011-05-12 Thread jacopo . farina
 in the

 gt; gt;gt; graph

 gt; gt;gt; as Output? Just like Dijkstra algorithm did.

 gt; gt;gt; I know there is a Dijkstra function in the API, but it only
return the

 gt; path

 gt; gt;gt; between two nodes.

 gt; gt;gt; It'll be really helpful for me if there is any function can
return all

 gt; the

 gt; gt;gt; result in one computation(even the whole result array
computing by

 gt; gt;gt; Dijkstra)

 gt; gt;gt;

 gt; gt;gt; Or does anyone has better idea to deal with this issue?

 gt; gt;gt; I tried to implement Dijkstra by myself, but it was
impossible to

 gt; declare

 gt; gt;gt; such big 2D array in the program...(OutOfMemoryException)

 gt; gt;gt;

 gt; gt;gt; If there is any advice, I'll really appreciate it.

 gt; gt;gt;

 gt; gt;gt; Thanks.

 gt; gt;gt; ___

 gt; gt;gt; Neo4j mailing list

 gt; gt;gt; User@lists.neo4j.org

 gt; gt;gt; https://lists.neo4j.org/mailman/listinfo/user

 gt; gt;gt;

 gt; gt; ___

 gt; gt; Neo4j mailing list

 gt; gt; User@lists.neo4j.org

 gt; gt; https://lists.neo4j.org/mailman/listinfo/user

 gt;

 gt; ___

 gt; Neo4j mailing list

 gt; User@lists.neo4j.org

 gt; https://lists.neo4j.org/mailman/listinfo/user

 gt;

 ___

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 User@lists.neo4j.org

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Re: [Neo4j] Error while creating EXE from JAR and Runnable JAR

2011-05-12 Thread Michael Hunger
Could you please share your complete project including the detailed steps you 
are executing to generate the exe. (e.g. via dropbox)

With only fragments of the information we can only guess at most. And with the 
shared project perhaps also other mailing-list users can help as well.

Thanks so much

Michael

Am 12.05.2011 um 11:02 schrieb Mattias Persson:

 Could you supply how your generated classpath looks like?
 
 2011/5/12 Abhishek AS abhishek@gmail.com
 
 Was creating an exe by exporting JAR and Runnable JARs thro eclipse..
 Using Launch4j to do that. and having proper manifest files with the class
 path too.. But i get the following error when i try to run the created exe
 file.
 Caused by:
 java.Lang.
 ClassNotFoundException: org.neo4j.graphdb.GraphDatabaseService
 at java.net.URLClassLoader$1.run
 at java.security.AccessController.doPrivileged
 at java.net.URLClassLoader.findClass
 at java.Land.ClassLoader.loadClass
 at sun.misc.Launcher$AppClassLoader.loadClass
 at java.Lang.ClassLoader.loadClass
 
 Could not find the main class: package name.Class name
 is there a solution to this.??
 i had actually created an exe earlier which was working perfectly fine..
 Plz help!
 
 Thanks.
 ___
 Neo4j mailing list
 User@lists.neo4j.org
 https://lists.neo4j.org/mailman/listinfo/user
 
 
 
 
 -- 
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 Hacker, Neo Technology
 www.neotechnology.com
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Re: [Neo4j] User Digest, Vol 50, Issue 43

2011-05-12 Thread Abhishek AS
Hey Peter,
Sure. We shall Skype when you're free.. Shall ping you! Thanks! :)
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Re: [Neo4j] Gwt + eclipse + Neo4j screencast + testings

2011-05-12 Thread Thomas Baum
hej rene,

 Right now I would be happy about some best practices to design a software
 backend using neo4j. You know in MySQL it is kind of straight forward how to
 build software around the data base. In neo4j a new way of thinking starts.
 I haven't really looked for it yet. But i guess there won't be anything out
 there anyway.

for a web-context it its is better start the embedded graph-db only once. in 
your screencast you will do this every request.

please try using a context-listener to start / shutdown the embedded db in a 
clean way.
so the access-times in the gwt-servlet will really rock!

http://www.mail-archive.com/user@lists.neo4j.org/msg08350.html


cheers
/thomas



 
 I was a little confused that there was a wiki and the other docs but that
 didn't really bother me. most the time I use google to search for resources
 anyway.
 
 Best regards René
 
 2011/5/9 Peter Neubauer peter.neuba...@neotechnology.com
 
 Rene,
 if you don't mind asking - what are the most valuable docs for you? We are
 trying to migrate from the wiki.neo4j.org to the generated and tested code
 snippets and edited documentation at docs.neo4j.org - it would be great to
 see what users find valuable to keep improving on to get started with
 Neo4j!
 
 Cheers,
 
 /peter neubauer
 
 GTalk:  neubauer.peter
 Skype   peter.neubauer
 Phone   +46 704 106975
 LinkedIn   http://www.linkedin.com/in/neubauer
 Twitter  http://twitter.com/peterneubauer
 
 http://www.neo4j.org   - Your high performance graph database.
 http://startupbootcamp.org/- Öresund - Innovation happens HERE.
 http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
 2011/5/9 René Pickhardt r.pickha...@googlemail.com
 
 Hey Peter,
 
 Since I want to redesign the backend of my social networking site for my
 PhD thesis and I am almost convinced that Neo4j is the way to go I will
 most
 certainly work with your graph data base over the next couple months and
 get
 to know it better. Since you guys made it open source (great!) I will try
 to
 give something back by continuing to blog about it.
 
 Once I get to know neo4j better and really start migrating my current
 data
 base to it and running the social networking site with neo4j as a backend
 I
 am sure to be able to give you guys more valuable feedback. Besides many
 questions which I can only solve by reading the docs I am satisfied right
 now.
 
 In my very own interest I wish you guys good luck with neo4j and of
 course
 many paying customers (-:
 
 best regards
 
 René
 
 
 2011/5/9 Peter Neubauer peter.neuba...@neotechnology.com
 
 You rock it Rene!
 
 Nice summary - please let us know how we can make your experience even
 more
 smooth and what you you think should be there for you to have an even
 better
 experience?
 
 Cheers,
 
 /peter neubauer
 
 GTalk:  neubauer.peter
 Skype   peter.neubauer
 Phone   +46 704 106975
 LinkedIn   http://www.linkedin.com/in/neubauer
 Twitter  http://twitter.com/peterneubauer
 
 http://www.neo4j.org   - Your high performance graph
 database.
 http://startupbootcamp.org/- Öresund - Innovation happens HERE.
 http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
 2011/5/9 René Pickhardt r.pickha...@googlemail.com
 
 Hey everyone,
 
 Peter asked me to post this to the list.  So here you go:
 
 Screencast explaining how to set up neo4j in eclipse and GWT:
 
 http://www.rene-pickhardt.de/how-to-combine-neo4j-with-gwt-and-eclipse/
 
 A short blog article with a sum up of my first testing on using neo4j
 on
 the
 friendship graph (and some other edges between users)  from the social
 networking site I run (~300'000 Edges):
 http://www.rene-pickhardt.de/neo4j-graph-database-vs-mysql/
 
 Thanks to neotechnology for providing such a great tool!
 
 Regards René
 
 --
 **www.twitter.com/renepickhardt
 
 Skype: rene.pickhardt
 
 www.rene-pickhardt.de
 http://www.beijing-china-blog.com
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 vorbestellen http://goo.gl/3H0Fm (Danke!) *
 
 --
 
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 -- 
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 Video gucken http://www.youtube.com/watch?v=aLesGMA0-rM und bei AMAZON
 vorbestellen http://goo.gl/3H0Fm (Danke!) *
 
 --
 
 mobile: +49 (0)176 6433 2481
 
 Skype: +49 (0)6131 

Re: [Neo4j] Gwt + eclipse + Neo4j screencast + testings

2011-05-12 Thread René Pickhardt
Hey Thomas,

thank you for your advice! I was reading the discussion with John and
already aware of the fact that this is the way to go. I already implemented
it and of course it is running much faster (-:
I hope you don't mind if I include this peace of work in an upcomming
blogpost in which I will also share a very basic gwt + neo4j application.

greetz René

2011/5/12 Thomas Baum thomas.b...@neopersistence.com

 hej rene,

  Right now I would be happy about some best practices to design a software
  backend using neo4j. You know in MySQL it is kind of straight forward how
 to
  build software around the data base. In neo4j a new way of thinking
 starts.
  I haven't really looked for it yet. But i guess there won't be anything
 out
  there anyway.

 for a web-context it its is better start the embedded graph-db only once.
 in your screencast you will do this every request.

 please try using a context-listener to start / shutdown the embedded db in
 a clean way.
 so the access-times in the gwt-servlet will really rock!

 http://www.mail-archive.com/user@lists.neo4j.org/msg08350.html


 cheers
 /thomas



 
  I was a little confused that there was a wiki and the other docs but that
  didn't really bother me. most the time I use google to search for
 resources
  anyway.
 
  Best regards René
 
  2011/5/9 Peter Neubauer peter.neuba...@neotechnology.com
 
  Rene,
  if you don't mind asking - what are the most valuable docs for you? We
 are
  trying to migrate from the wiki.neo4j.org to the generated and tested
 code
  snippets and edited documentation at docs.neo4j.org - it would be great
 to
  see what users find valuable to keep improving on to get started with
  Neo4j!
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
 database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
  2011/5/9 René Pickhardt r.pickha...@googlemail.com
 
  Hey Peter,
 
  Since I want to redesign the backend of my social networking site for
 my
  PhD thesis and I am almost convinced that Neo4j is the way to go I will
  most
  certainly work with your graph data base over the next couple months
 and
  get
  to know it better. Since you guys made it open source (great!) I will
 try
  to
  give something back by continuing to blog about it.
 
  Once I get to know neo4j better and really start migrating my current
  data
  base to it and running the social networking site with neo4j as a
 backend
  I
  am sure to be able to give you guys more valuable feedback. Besides
 many
  questions which I can only solve by reading the docs I am satisfied
 right
  now.
 
  In my very own interest I wish you guys good luck with neo4j and of
  course
  many paying customers (-:
 
  best regards
 
  René
 
 
  2011/5/9 Peter Neubauer peter.neuba...@neotechnology.com
 
  You rock it Rene!
 
  Nice summary - please let us know how we can make your experience even
  more
  smooth and what you you think should be there for you to have an even
  better
  experience?
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
  database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
 party.
 
 
  2011/5/9 René Pickhardt r.pickha...@googlemail.com
 
  Hey everyone,
 
  Peter asked me to post this to the list.  So here you go:
 
  Screencast explaining how to set up neo4j in eclipse and GWT:
 
  http://www.rene-pickhardt.de/how-to-combine-neo4j-with-gwt-and-eclipse/
 
  A short blog article with a sum up of my first testing on using neo4j
  on
  the
  friendship graph (and some other edges between users)  from the
 social
  networking site I run (~300'000 Edges):
  http://www.rene-pickhardt.de/neo4j-graph-database-vs-mysql/
 
  Thanks to neotechnology for providing such a great tool!
 
  Regards René
 
  --
  **www.twitter.com/renepickhardt
 
  Skype: rene.pickhardt
 
  www.rene-pickhardt.de
  http://www.beijing-china-blog.com
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  Video gucken http://www.youtube.com/watch?v=aLesGMA0-rM und bei
 AMAZON
  vorbestellen http://goo.gl/3H0Fm (Danke!) *
 
  --
 
  

[Neo4j] Neo4j on AWS

2011-05-12 Thread Maarten Haubrich
Hello,

I was wondering if anyone had any suggestions on how best to deploy a Neo4j 
application to Amazon Web Services.

Initially spinning up a single EC2 instance with an EmbeddedGraphDatabase will 
do, but that solution does not scale.

Ideally, I would be able to use ElasticBeanstalk to manage and auto-scale my 
application servers and have them connect to a single Neo4j server instance.

Thoughts?

Best,
Maarten
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Re: [Neo4j] Spring Data Graph Load Time Weaving

2011-05-12 Thread Michael Hunger
Maarten, 

sorry was away with the family. Yes I get the emails but will respond this one 
to the ML - content of general interest.

I'd say writing  a client against the low level rest API is about twice the 
work and much worse performance wise, because:

- you make a lot more requests (.e.g 1+n selects)
- transaction scope == 1 request
- you transfer much more data than you need

To optimize using the REST API you have to write all your database access in 
terms of traversals (then you automatically transfer a multiple of the data you 
need). Any modification affects just a single element (property, node, 
relationship), indexing counts extra.
Also index lookup (for instance to assert that data is not inserted twice (also 
for duplicate relationships) costs a lot more. 

These were at least my experiences with the domains I worked with against the 
server.

The difference to SQL / HSQLDB is that we have no query language _yet_ which 
allows for fine grained filtering, traversals and projections. I.e. ways to get 
exactly that back from the DB what you want, not less not more. Same goes for 
updates, in SQL you have the DML (insert, update, delete) which also works with 
large datasets and batching data. We don't have that yet either.

That's why creating a domain level protocol that covers the use-cases you want 
to talk about with the server, e.g.
* fetch me all friends that have a xxx offering, or
* update all the status information of this list of people, or 
* give me the recommendations for buying new products for the friends of this 
guy.

speaking in domain language, with a granularity that fits your demands (and is 
not too fine grained and not to coarse grained) and which transports only that 
over the wire that you need in your app while being highly performant because 
it talks directly to the embedded graphdb. You can even use the same domain 
model (or in this case rather presentation-model) in the server extension and 
your app-server (grails) that is then just serialized accordingly and 
transported to the view and controller-layer (i.e. your app-server). This 
maximizes throughput, creates the correct transaction boundaries and minimizes 
latency.
If you want to you can create this domain level protocol even as a RESTful 
interface that also other clients/consumers could talk to the Neo4j-Server 
extensions (e.g. javascript consuming the JSON or ruby or whatever).

Regarding HA, yes you can embed Neo4j in your application servers and have all 
those instances form a cluster that is automatically synced. Being HA it works 
with transactions and concurrency, no worries. But you're right updates to the 
other slaves are eventual consistent. That's why you would employ sticky routes 
so that the user that just wrote information to a slave is routed again to that 
slave for reading.

(See also the Neo4j - manual: 
http://docs.neo4j.org/chunked/milestone/ha-architecture.html)

HTH

Michael

Am 12.05.2011 um 17:34 schrieb Maarten Haubrich:

 Sorry for the spam, but I'm not sure if you are getting emails from my 
 maar...@caregaroo.com email address...
 
 
 Thanks for the quick reply, Michael!
 
 sorry, but I don't quite understand.
 
 What do you mean by a clean domain layer protocol that talks in your domain 
 + use cases are server extensions?
 
 Would I write a separate application that runs an embedded neo and abstracts 
 the database away and then have my clients (the actual web servers) use that 
 proprietary protocol to get the data? That seems like a lot of extra work. 
 
 From an operations standpoint I would rather just deploy a server and have it 
 behave in the same manner as the embedded version (like HSQLDB) - but I 
 understand that things are not quite as simple as that :)
 
 Also, it would be helpful if you could expand a bit on the issues with the 
 REST API, since I have just read snippets here and there in the mailing list.
 
 Regarding the enterprise version: So with this version I can have my database 
 embedded in each of the application servers and neo will handle keeping all 
 instances in sync for me. How does that work in terms of transactions and 
 concurrency? Is all the data replicated immediately, or is it more like the 
 eventual consistency in Amazon SimpleDb.
 
 Thanks a lot for your time.
 
 Best,
 Maarten
 
 
 
 
 
 
 On 2011-05-12, at 7:25 AM, Michael Hunger michael.hun...@neotechnology.com 
 wrote:
 
 Maarten,
 
 Cluster does not necessarily mean server. Any Neo4j enterprise instance can 
 run in clustered (HA) mode (embedded or not), 
 
 server or embedded depends on how you want to access the db - in process 
 (part of your app-server) or out of process - neo4j-REST protocol.
 
 There are no other things, but just the REST API as an issue. Which you 
 wouldn't use anyway as a clean domain layer protocol that talks in your 
 domain + use-cases as a server extension is the way to go.
 
 Cheers
 
 Michael
 
 Am 12.05.2011 um 16:15 schrieb Maarten Haubrich:
 

Re: [Neo4j] Neo4j EC2 AMI image available

2011-05-12 Thread Peter Neubauer
Daniel,
I would put some Apache server in front of it and secure it on URL patterns,
see http://docs.neo4j.org/chunked/snapshot/operations-security.html for a
simplicstic example.

Would that work?

Cheers,

/peter neubauer

GTalk:  neubauer.peter
Skype   peter.neubauer
Phone   +46 704 106975
LinkedIn   http://www.linkedin.com/in/neubauer
Twitter  http://twitter.com/peterneubauer

http://www.neo4j.org   - Your high performance graph database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.


On Wed, May 11, 2011 at 10:57 PM, Daniel Gasienica dan...@gasienica.chwrote:

 This is great news! What is the simplest way to secure a Neo4j instance on
 AWS?

 Daniel


 On Tue, May 10, 2011 at 06:29, Peter Neubauer 
 peter.neuba...@neotechnology.com wrote:

  Hi all,
  Jussi Heinonen from OpenCredo has created a Neo4j Server EC2 image to try
  out things with. Well done, thanks for the effort Jussi!
 
  Read more abotu it and feel free to give feedback -
 
 
 http://jussiheinonen.blogspot.com/2011/05/neo4j-graph-database-server-image-in.html
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
 database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
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Re: [Neo4j] Index Framework - Query Question

2011-05-12 Thread Rick Bullotta
Hi, Mattias.

I'll definitely give it a try.

Ultimately, I'd like to achieve the following scenario (and maybe you can give 
us some guidance on how to implement it):

As a use case: we want to index the node associated with a collaboration 
entry (that has a timestamp, tag(s), location, textual content, and 
potentially some numeric values as properties) on a combination of what is 
currently many different types of indexes in Neo - fulltext, timeline, spatial, 
and plain (key/value field(s)).We'd like to search/query on any 
combination of those elements.  

We've been considering a few options:

- use relationships (that wouldn't meet our performance/concurrency 
requirements)
- use the current index framework with separate indexes, query multiple times, 
and do the set comparison/intersection in our code
- bypass Neo's indexing model altogether and go directly to Lucene, though we'd 
lose the transaction capabilities
- hack the Neo code for the various Lucene index implementations and create our 
own composite index index type that supports fulltext fields, geospatial 
fields, simple data types (string, number, boolean), timeline, and multi-valued 
fields

I like option #4, but we'd definitely need some help and input to build it in a 
way that wasn't too fragile from version to version of Neo.  I think it is a 
capability that would be broadly useful for a lot of Neo users, though, and 
would fit nicely with some of the work Anders is doing in a Neo query 
language/syntax.

I do think the ability to have more control at the field level could lead to 
some cool capabilities and significant optimizations both in storage and 
retrieval.  I also think you've managed to work around the transactioning 
issues, so it would be foolish to re-invent the wheel there.  The basic idea 
would be a composite index that perhaps had a new add method which accepted a 
Field definition instead of just a simple string field name.  The Lucene index 
implementation could leverage this to exploit a lot of the power of Lucene to 
meet the overall goal of a very flexible indexing/query subsystem for Neo4J.  
Additionally, the Field definition for full-text fields could have an analyzer 
associated with it, rather than an Analyzer at the index level only.

If you would be up for it, maybe we come over to Sweden for a couple days and 
hack #4 together, or we could do it virtually? 

Thoughts?

Rick

-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On 
Behalf Of Mattias Persson
Sent: Thursday, May 12, 2011 3:55 AM
To: Neo4j user discussions
Subject: Re: [Neo4j] Index Framework - Query Question

Could you perhaps create an index with a custom Analyzer which treats titles
as fulltext and others as non-analyzed?

2011/5/11 Rick Bullotta rick.bullo...@thingworx.com

 Is there currently any way to have a composite index consisting of fulltext
 and non-analyzed (simple fields), and to query them in a single query
 statement?  e.g. :  title:Reloaded AND year:1999

 In this case, I'd be using a Lucene Analyzer on the title, but indexing the
 primitive types without using the analyzer/norms/etc...I know how to do it
 with Lucene directly, but not clear if it can be done w/Neo4J.

 Thanks!

 Rick

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-- 
Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
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Re: [Neo4j] Neo4j EC2 AMI image available

2011-05-12 Thread Daniel Gasienica
Thanks, Peter. I've found that piece of documentation before but Jussi just
outlined an even more straightforward way of securing Neo4j on AWS:

http://jussiheinonen.blogspot.com/2011/05/neo4j-graph-database-server-image-in.html?showComment=1305213734091#c177328379806909558

–Daniel

On Thu, May 12, 2011 at 11:31, Peter Neubauer 
peter.neuba...@neotechnology.com wrote:

 Daniel,
 I would put some Apache server in front of it and secure it on URL
 patterns,
 see http://docs.neo4j.org/chunked/snapshot/operations-security.html for a
 simplicstic example.

 Would that work?

 Cheers,

 /peter neubauer

 GTalk:  neubauer.peter
 Skype   peter.neubauer
 Phone   +46 704 106975
 LinkedIn   http://www.linkedin.com/in/neubauer
 Twitter  http://twitter.com/peterneubauer

 http://www.neo4j.org   - Your high performance graph database.
 http://startupbootcamp.org/- Öresund - Innovation happens HERE.
 http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.


 On Wed, May 11, 2011 at 10:57 PM, Daniel Gasienica dan...@gasienica.ch
 wrote:

  This is great news! What is the simplest way to secure a Neo4j instance
 on
  AWS?
 
  Daniel
 
 
  On Tue, May 10, 2011 at 06:29, Peter Neubauer 
  peter.neuba...@neotechnology.com wrote:
 
   Hi all,
   Jussi Heinonen from OpenCredo has created a Neo4j Server EC2 image to
 try
   out things with. Well done, thanks for the effort Jussi!
  
   Read more abotu it and feel free to give feedback -
  
  
 
 http://jussiheinonen.blogspot.com/2011/05/neo4j-graph-database-server-image-in.html
  
   Cheers,
  
   /peter neubauer
  
   GTalk:  neubauer.peter
   Skype   peter.neubauer
   Phone   +46 704 106975
   LinkedIn   http://www.linkedin.com/in/neubauer
   Twitter  http://twitter.com/peterneubauer
  
   http://www.neo4j.org   - Your high performance graph
  database.
   http://startupbootcamp.org/- Öresund - Innovation happens HERE.
   http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
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Re: [Neo4j] Neo4j EC2 AMI image available

2011-05-12 Thread Aseem Kishore
That's indeed a nice and simple approach. It would be nice if admins could
access the web interface from a browser though. Would that be possible using
the Amazon security approach?

Aseem

On Thu, May 12, 2011 at 7:00 PM, Daniel Gasienica dan...@gasienica.chwrote:

 Thanks, Peter. I've found that piece of documentation before but Jussi just
 outlined an even more straightforward way of securing Neo4j on AWS:


 http://jussiheinonen.blogspot.com/2011/05/neo4j-graph-database-server-image-in.html?showComment=1305213734091#c177328379806909558

 –Daniel

 On Thu, May 12, 2011 at 11:31, Peter Neubauer 
 peter.neuba...@neotechnology.com wrote:

  Daniel,
  I would put some Apache server in front of it and secure it on URL
  patterns,
  see http://docs.neo4j.org/chunked/snapshot/operations-security.html for
 a
  simplicstic example.
 
  Would that work?
 
  Cheers,
 
  /peter neubauer
 
  GTalk:  neubauer.peter
  Skype   peter.neubauer
  Phone   +46 704 106975
  LinkedIn   http://www.linkedin.com/in/neubauer
  Twitter  http://twitter.com/peterneubauer
 
  http://www.neo4j.org   - Your high performance graph
 database.
  http://startupbootcamp.org/- Öresund - Innovation happens HERE.
  http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
 
 
  On Wed, May 11, 2011 at 10:57 PM, Daniel Gasienica dan...@gasienica.ch
  wrote:
 
   This is great news! What is the simplest way to secure a Neo4j instance
  on
   AWS?
  
   Daniel
  
  
   On Tue, May 10, 2011 at 06:29, Peter Neubauer 
   peter.neuba...@neotechnology.com wrote:
  
Hi all,
Jussi Heinonen from OpenCredo has created a Neo4j Server EC2 image to
  try
out things with. Well done, thanks for the effort Jussi!
   
Read more abotu it and feel free to give feedback -
   
   
  
 
 http://jussiheinonen.blogspot.com/2011/05/neo4j-graph-database-server-image-in.html
   
Cheers,
   
/peter neubauer
   
GTalk:  neubauer.peter
Skype   peter.neubauer
Phone   +46 704 106975
LinkedIn   http://www.linkedin.com/in/neubauer
Twitter  http://twitter.com/peterneubauer
   
http://www.neo4j.org   - Your high performance graph
   database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
  party.
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