Hello
I am also interesed in testing Neo4J as a RDF Triple Store.
Thanks Marco for pointing to this.
If we use the Ouplementation of Tinkerpop for Sail and Neo4J, are there any
features Neo4J offers or performance optimizations or other things we can
not use in such a setup?
I think i have read
When running a test neo4j application on Solaris that I have previously run
successfully on Windows I'm encountering the following exception:
Caused by: java.io.IOException: Resource temporarily unavailable
at sun.nio.ch.FileChannelImpl.map0(Native Method)
at
Hi!
Hi, Anders.
Just wanted to let you know that the 1.4 version of Neoclipse seems to always
show all properties as graph decorations, regardless of what is
configured/specified.
It's because I made the Expanded node mode on by default. I thought
that it would be a better default for
is it true that in neo4j there is no remote thread-safe API. This
means that when making a multi-threaded solution you run into problems
when updating relationships between nodes. Under stress you are likely
to want to update a relationship while another thread has a lock and
as such you run into
I just wanted to remind folks that a PHP REST client based on Neo4j V1.3
has been available for some time at
http://github.com/tchaffee/Neo4J-REST-PHP-API-client
https://github.com/tchaffee/Neo4J-REST-PHP-API-client
I am working on finishing up traversals, and other than that it is a
complete
Further to an earlier posting I also notice this warning from neo4j which
sounds relevant..? Note that the application does continue and eventually
complete successfully having taken orders of magnitude longer than when run on
windows. This is running on solaris - any suggestions about what
can you please mail me the code, dataset and results as we too need to
evaluate neo4j and your code will come handy
thanx
On 6/29/11, Agelos Pikoulas agelos.pikou...@gmail.com wrote:
My problem pattern is exactly the same as Niels's :
A dense-node has millions of relations of a certain
Hi!
Thanks for the reminder!
Regarding the wiki: did you just sign up? There's a 24h delay in place
at the moment, before you can edit pages. You also have to confirm your
email address to get edit permission.
/anders
On 06/30/2011 11:03 AM, Todd Chaffee wrote:
I just wanted to remind folks
Hi Aliabbas,
is it true that in neo4j there is no remote thread-safe API.
No. That is a false assertion. The REST API is thread safe since it wraps the
same thread-safe code as the Java APIs.
There can still be *contention* but there is always thread safety (and ACIDity).
Jim
The issue there is that your client requests each have their own transaction so
there.
If you want to execution multiple requests transactionally in one block you
should use the new batch-rest API.
http://docs.neo4j.org/chunked/milestone/rest-api-batch-ops.html
Cheers
Michael
Am 30.06.2011
A colleague has speculated that it maybe related to permissions. Im on a
shared solaris box with no setuid access - can anyone elaborate on whether some
specific access rights are required to use memory mapped IO?
Sent from my iPhone
On 30 Jun 2011, at 11:20, Paul Bandler pband...@cseuk.co.uk
Paul,
what version of Solaris are you running that on? We don't have Solaris as part
of our build-qa workflow (yet). So I would try to see if there is an ec2
instance that I could just use for that.
Cheers
Michael
Am 30.06.2011 um 13:26 schrieb Paul Bandler:
A colleague has speculated that
This topics has come up before, and the domain level solutions are usually
very similar, like Norbert's category/proxy nodes (to group by
type/direction) and Niels' TimeLineIndex (BTree). I wonder whether we can
build a generic user-level solution that can also be wrapped to appear as an
internal
The issue being that relationships on disk are not ordered, so that, even when
just accessing the few relationships of the one
type you still have to scan all rels.
For supporting different approaches you either have to change the store-format
to handle the storage and loading of relationships
Michael,
Is it possible/feasible to change the store-format so relationships are stored
partitioned per relationshiptype per direction? What would be the impact of
such change?
Niels
From: michael.hun...@neotechnology.com
Date: Thu, 30 Jun 2011 14:10:38 +0200
To: user@lists.neo4j.org
Hi Kriti,
I can comment on a few things, especially neo4j-spatial:
- Neo4j is certainly good for social networks, and people have used it
for that, but I personally do not have experience with that so I will not
comment further (others can chip in where necessary).
- Neo4j-Spatial is
Hi Anders,
I did just sign up to the wiki. I'll wait 24 hours and give it another try.
Thanks,
Todd
On 30/06/11 12:57, user-requ...@lists.neo4j.org wrote:
Message: 3 Date: Thu, 30 Jun 2011 12:51:42 +0200 From: Anders Nawroth
and...@neotechnology.com Subject: Re: [Neo4j] PHP REST Client for
Any suggestions on this please ?
It is really acting as a blocker for me. I have tried multiple alternatives,
but I come up with one issue or the other.
On Wed, Jun 22, 2011 at 8:51 PM, V vlin...@gmail.com wrote:
I am confused, elements is defined as
@RelatedTo(type = ELEMENT, elementClass =
I have an element of my node marked with
@Indexed
String name
I want to ensure that when I persist nodes, only one node with that name
gets persisted. (I want to throw an error here and ask the user to give a
different name)
What is the best way to ensure this. Any suggestions ?
- Karan
TEST:bandlerp@us2187$ uname -X
System = SunOS
Node = us2187
Release = 5.10
KernelID = Generic_13-03
Machine = sun4u
BusType = unknown
Serial = unknown
Users = unknown
OEM# = 0
Origin# = 1
NumCPU = 16
Sent from my iPhone
On 30 Jun 2011, at 12:53, Michael Hunger
I asked this same question a little while ago, the answer is that its up to
you to guarantee uniqueness. There are a few different ways to to this, for
now I took the easy way out and do all writes with a single thread. I'm
basically just using a ThreadPoolExecutor with a single thread and
Hi Dario,
Could you post the error message and stacktrace?
Did the error happen after initial import but still running in batch
inserter mode or normal server/embedded transactional mode?
Regards,
Johan
On Wed, Jun 29, 2011 at 4:30 PM, Dario Rexin dario.re...@xing.com wrote:
Hi all,
Today I added a List class to the graph-collections repo:
https://github.com/peterneubauer/graph-collections/tree/master/src/main/java/org/neo4j/collections/list
The List class implements the java.util.ListNode interface.
Niels
Guys,
if you can write some illustrative test code for the different
collections, I could undertake to put some documentation skeleton into
place that can be merged into the main manual and look like
http://docs.neo4j.org/chunked/snapshot/. To start with, we could have
it separately though.
WDYT?
you have to escape the url index value
otherwise the jersey rest framework consumes it silently. I had this problem
when working on the birdies demo app. Took me a while to work that out.
see http://github.com/jexp/birdies
and http://birdies.heroku.com
Michael
Sent from my iBrick4
Am
I'll look into that in the next few days.
Michael
Sent from my iBrick4
Am 30.06.2011 um 16:25 schrieb Matt Chambers yougotroo...@gmail.com:
I asked this same question a little while ago, the answer is that its up to
you to guarantee uniqueness. There are a few different ways to to this,
For neo4j.graph-collections.list.List I suggest the following.
The graph collections List class is an implementation of the java.util.List
class, parameterized with Node, supporting all methods, except subList(int
start, int end).
Whenever nodes need to be stored as a list, the List class can
I have done a lot of these structures already, so before (re)doing a lot of
these structures take a look at:
https://svn.neo4j.org/components/utils/trunk/src/main/java/org/neo4j/util/(the
old subversion repository, but the utils are quite up2date). Please
take a look there and feel free to pull
Further to the problems reported below from running a test application on a
server class Solaris box (M4000) I re-ran the test but with the setting
'use_memory_mapped_buffers' set to false. This had the +ve effect of avoiding
the warnings and nio exceptions mentioned before so clearly there's
Hi Mattias,
I just looked through the code in neo4j-util and will try to port relevant
classes to graph-collections. I have one question, though. Several methods make
a call to GraphDatabaseUtil.acquireWriteLock, which performs one operation:
the removal of the property
Dear Graphistas,
Im glad this topic is getting traction, cause I think this issue is *MAJOR*.
I firmly believe that if neo4j wants to become the Web 2/3 ready and Social
1/2 ready graphdb, it has to be able to accommodate fast Traversals among
hundreds of thousands or millions of artifact nodes
Just putting Angelos answer in this thread where it belongs :)
Dear Graphistas,
Im glad this topic is getting traction, cause I think this issue is *MAJOR*.
I firmly believe that if neo4j wants to become the Web 2/3 ready and Social
1/2 ready graphdb, it has to be able to accommodate fast
Neo4j is not implementing storing and traversing memory only structures. So it
would be really advisable to do that in your domain layer only.
I'll look into the elements returning null. I thought I already solved that
some time ago. Which version of SDG are you using?
Cheers
Michael
Am
Hi,
You may want to have references to different graph representations. For example:
GraphDatabaseService neo4j = new EmbeddedGraphDatabase(/tmp/neo4j);
Graph graph = new Neo4jGraph(neo4j);
Sail sail = new GraphSail(graph);
With 'neo4j' you have a reference to the GraphDatabaseService and can
In theory the approach I described earlier could work, though there are some
pitfalls to the current implementation that need ironing out before this can
become a recommended approach.
The choice of Timeline instead of Btree may actually be the wrong choice after
all. I chose Timeline because
In the amanzi-index I link all indexed nodes into the index tree, so
traversals are straight up the tree. Of course this also means that there
are at least as many relationships as indexed nodes.
I was reviewing Michaels code for the relationship expander, and think that
is a great idea,
Oops - it seems it might not be neo4j that's chewing up the CPUby making my
log4j calls disabled with 'if(_log.isDebugEnabled)' pre-conditions to avoid the
expense of constructing the strings that might or might get logged, I was able
to improve the times for the 'hot-cache' tests described
I am using the latest version 1.1.0.M1
Please have a look and let me know
Karan
On Fri, Jul 1, 2011 at 2:29 AM, Michael Hunger
michael.hun...@neotechnology.com wrote:
Neo4j is not implementing storing and traversing memory only structures. So
it would be really advisable to do that in your
The relationship expander approach could certainly work for me. I already have
a meta layer containing information about relationship types, so it would be a
minor upgrade to store the type of relationship expander per relationship type
and to access relationships through the expander instead
Paul,
that's great news. I already wanted to ask you to profile it.
Could you please re-post the new numbers ?
Unfortunately we have no Solaris Box right now and on amazon ec2 there are just
some OpenSolaris AMI images from 2009 available (don't know how compatible they
are with Solaris 5.10
So far we have only considered the situation where one side of the relationship
leads to a densely populated node, while the other side of the relationship
leads to a non-densely populated node. This is likely to be the most prevalent
situation (eg. category or class nodes), but it is
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