I'm happy to announce that Neo Technology sponsors the Global Day of Code
Retreat as a Continent Sponsor.
Quote from Corey Haines (http://coderetreat.org)
Global Day of Coderetreat is a world-wide event celebrating passion and
software craftsmanship.
Over 2000 passionate software developers
Cool,
just looking up Copenhagen ...
http://coderetreat.ning.com/events/global-day-of-coderetreat-in-copenhagen
Cheers,
/peter neubauer
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Looks great to me Nigel! I think this is a very good first step on
parameters. Let me know when you are done with the Java code, would
like to bring this into the @Graph annotations after our next
milestone release, 1.6.M01.
/peter
On Tue, Nov 22, 2011 at 10:14 PM, Nigel Small
Hi there, I've posted a few days ago about the POC I'm doing here at my
company. I have some initial numbers and I'd like to ask for some help here
in order to promote neo4j here in LMI Ericsson.
I've loaded a mySQL db with a really simple entity, that pretty much only
represents a node and
Hi Peter,
I am more stuck today than yesterday oO I can't get the index to appear in
the indexmanager any more. First I dropped the database and started from
zero:
C:\neo4j-community-1.5\binNeo4j.bat start
SERVICE_NAME: Neo4j-Server
TYPE : 10 WIN32_OWN_PROCESS
Vinicius,
in order to cut down on the REST JSON overhead (which you don't have
in the RDBMS case), maybe you could look at just counting the results,
something like
START n = node(3)
MATCH n--()--(x)
return count(x)
And see what happens?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Hi Peter, thanks, that indeed boosts to lower 10 ms, but we really need to
access the nodes to perform the operations.
I know that to be fair on a test, we should be running an embedded version
of neo4j inside the appserver, after all the cache resides in the same JVM.
But I'm not worried with
Hi Peter,
thanks a lot for your answer! Our alternative will be to keep a copy of the
properties in memcached. Another option would have been to create a second
graph, which is used only to store the properties in nodes/relationships,
but from my view this has the disadvantage of different
Vinicius,
in real-world usages, you probably want to build a REST API that
operates on domain and usecase level. Shuffling 6K nodes forth and
back and resolve properties sounds not good to me, given the REST
discovery overhead of the JSON representation. At the very least, you
could do
START n =
Peter, I agree with you, would not be the ideal scenario, I would never
access a REST api that way, at minimum pagination should be there. But we
have this really specific case, where we need to have (not whole domain)
but at least part of it (power, bearing, gain, frequency) to perform some
Vinicius,
first: did you have any issues importing the data into Neo4j?
second: your example used cypher which is not optimized for performance (yet!).
This is in our plans for the next two releases of neo4j.
So if you want to see the real performance of neo4j, please use the traversal
The companion piece of this test is how fast you can get data *into* your
database. Have you run a comparison of those two scenarios with MySQL vs
Neo4J? We found Neo4J to be substantially faster with inserting/updating data
as long as we executed our transactions in blocks of 50-1000.
Hi Michael, thanks. The data load was fine, I've used your script with the
BathInserter. Memory footprint was really slow, I think the peak was 200mb
of heap usage. I did something really retarded and left a logger.info,
which slowed things a bit, but the process was really smooth.
Many thanks on
Please use EmbeddedGraphDatabase,
EmbeddedReadOnlyGraphDatabase caches a snapshot of the data in its caches and
doesn't get update-changes.
Michael
Am 23.11.2011 um 14:39 schrieb Vinicius Carvalho:
Hi Michael, thanks. The data load was fine, I've used your script with the
BathInserter.
But wouldn't it mean that I need to have exclusive lock on the db? I would
like to keep the server running pointing at the same data directory.
Regards
On Wed, Nov 23, 2011 at 1:50 PM, Michael Hunger
michael.hun...@neotechnology.com wrote:
Please use EmbeddedGraphDatabase,
Just make sure that it is just a snapshot of the data and doesn't update its
caches.
Otherwise you will run into synchronization issues.
See also this thread and Tobias' explanations around it:
Tks, for this test it's just a readonly graph now, so I don't think I'll
run into synchronization issues. As we proceed with tests, I do hope that
we will have one day is a HA version of neo4j. And as Jim's said in that
thread, use it for other to read the graph.
Regards
On Wed, Nov 23, 2011 at
Daniel,
try this:
curl -X POST
http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer
-H Content-Type:application/json -d '{layer:geom, lat:lat,
lon:lon}'
curl -X POST http://localhost:7474/db/data/node -H
Content-Type:application/json -H Accept:application/json -d
'{lon:
Hi Michael, this is going to be a newbie question, so please forgive me:
I've re ran the tests with your examples, and using a embedded database.
First thing: Whooping FAST! Mind blowing :D - 5ms
But ... I got different results, same time though which is great, proves
the exact thing that
You might run into uniqueness constraints.
There are different uniqueness constraints that can be specified for a
traversal, meaning how often is a node visited during one.
(see here:
http://components.neo4j.org/neo4j/1.6-SNAPSHOT/apidocs/org/neo4j/kernel/Uniqueness.html)
You probably want to
Tks once again Michael.
Adding the Direction.Outgoing nailed it, I have the same dataset as the
ones using cypher
On the first one using the traversaldescription, I've modified to:
TraversalDescription traversalQuery =
hi,
i noticed that you were using db.getNodeById to retrieve the starting
node. the performance of this method call is quite different from real
world apps especially those have external unique id. basically you
need to index the external id yourself and get it via index call.
besides, i'd suggest
Hi Peter,
first cURL doesn't like me:
C:\curl -X POST
http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer
{
message : Mandatory argument \layer\ not supplied.,
exception : java.lang.IllegalArgumentException: Mandatory argument
\layer\ not supplied.,
stacktrace : [
I found these readymade databases very helpful.
Who made them from the start? I am interesting in getting a description of
their content, i.e. the domain model, and how it was created.
And does the cineast one come from
https://github.com/neo4j-examples/cineasts btw?
Thanks.
--
View this
Is it possible to add attributes to relationships? I would like to for example
have a relationship like Person VISITED Building but then add a timestamp or
additional attributes to the VISITED relationship between those two nodes.
If this is not supported, what is a good alternative in the
Absolutely. And fairly unique to Neo4J. Plus you can even index and traverse
relationships on those attributes (properties)!
-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On
Behalf Of Stefan Arentz
Sent: Wednesday, November 23, 2011 12:34
When running Neoclipse on Lion (10.7.2) with the latest Java 10.6, the Eclipse
menu bar is missing. Is this a known problem? Is there a workaround?
S.
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On 2011-11-23, at 12:35 PM, Rick Bullotta wrote:
Absolutely. And fairly unique to Neo4J. Plus you can even index and traverse
relationships on those attributes (properties)!
Yeah, I should have gone straight to the JavaDoc. Good to see that Relationship
is a PropertyContainer.
I was
Absolutely. And fairly unique to Neo4J. Plus you can even index and
traverse relationships on those attributes (properties)!
Yeah, I should have gone straight to the JavaDoc. Good to see that
Relationship is a PropertyContainer.
I was confused because the introduction documentation
Sorry,
Cut and paste does not work, please remove the line breaks on my mail :-)
/peter
Sent from my phone, please excuse typos and autocorrection.
On Nov 23, 2011 5:16 PM, danielb danielbercht...@gmail.com wrote:
Hi Peter,
first cURL doesn't like me:
C:\curl -X POST
I think you're right, Anders. With the page splits, it makes sense to reiterate.
(abk)
On Nov 23, 2011, at 10:15 AM, Anders Nawroth wrote:
Sure, that information is only on the nodes page now I think ... should
be on the relationships and properties pages as well of course.
Thanks for the
Hi Peter,
I have posted the statements in 1 line, but no success with cURL. I think I
have messed up the database at work, it was allready filled with nodes from
OSM testing. I now started a new database at home and also included one
additional line:
http POST
On 2011-11-23, at 12:35 PM, Stefan Arentz wrote:
When running Neoclipse on Lion (10.7.2) with the latest Java 10.6, the
Eclipse menu bar is missing. Is this a known problem? Is there a workaround?
Ahh so it seems the tool does not actually have a menu bar. To open a database
you have to go
Was lange währt wird endlich gut! Thanks for your feedback, will raise
a few issues following this :)
Cheers,
/peter neubauer
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