Geospatial use cases with Neo4j are interesting. A colleague recently asked if there was a way to identify which pieces of property a power line might intersect. Thinking back to previous work on H3 and Neo4j, I knew we could model the power line as a set of hex addresses and model the property geometry […]
Author: dave fauth
Neo4j 5 Error Messages
Recently we noticed some customers having these types of warning messages in their debug.log file: These warnings occur if these additional jvm settings are missing from the neo4j.conf. This would impair the ability of the JVM to manage memory when it became contentious and as a result you see errors begin to appear in the […]
Geospatial Graph – Simple Queries
In this blog post, we are going to run through some simple queries to show how to query and traverse the graph. We are going to focus on the geospatial database for now. The next blog post will discuss using the Neo4j 5 Composite Database for the distributed queries. Data Model As a quick refresher […]
Geospatial Graph Data Model
What Is a Knowledge Graph? Here is the definition from the Neo4j white paper “A knowledge graph is an interconnected dataset enriched with semantics so we can reason about the underlying data and use it confidently for complex decision-making”. Connecting data adds context and improves outcomes. Connecting data makes that data inherently more valuable and […]
Neo4j – H3 Datasets
H3 allows us to help make sense of large amounts of data. For this blog series, we will use the NYC Taxi Data set and add in the NYC Taxi Zones, New York Counties, NYC Boroughs and NYC Buildings. I also added in Open Street Map POI data using the Python notebook from my colleague […]
Neo4j – H3 Library – Update
After about four years (where did that time go?), I have circled back to Neo4j and H3 geospatial data processing. Since version 3.4, Neo4j has a native geospatial datatype. Neo4j uses the WGS-84 and WGS-84 3D coordinate reference system. Within Neo4j, we can index these point properties and query using our distance function or you query within a bounding […]
Neo4j – Kafka – JAAS
A couple of weeks ago, I was asked how to configure Neo4j to use JAAS with Kafka using SASL_Plaintext. While the Neo4j documentation does talk about SSL configuration, it doesn’t specifically discuss JAAS. On the Kafka side, I used a Bitnami AMI (Kafka – AMI ID bitnami-kafka-2.3.0-0-linux-debian-9-x86_64-hvm-ebs-nami (ami-0ca61ab6a3b990db7)) running on AWS. There were some configuration […]
Neo4j Python 4 Driver – Example
While Neo4j 4.0 was released in December 2019, the Neo4j 4.0 python driver wasn’t ready to be released at that time. In the last week or so, Neo4j released a 4.0.0a4 version of the driver that allows for multi-database support. The driver documentation has been updated to show how to use the latest driver. Someone […]
Kafka – Neo4j – SSL Config
This blogpost provides guidance to configure SSL security between Kafka and Neo4j. This will provide data encryption between Kafka and Neo4j. This does not address ACL confguration inside of KAFKA. Self Signed Certificates This section came from https://medium.com/talking-tech-all-around/how-to-enable-and-verify-client-authentication-in-kafka-21e936e670e8Make sure that you have truststore and keystore JKSs for each server.+ In case you want a self signed […]
Spark to Neo4j
This blog post is mostly for my benefit and for the ability to go back and remember work that I have done. With that being said, this blog post talks about the Neo4j Spark Connector that allows a user to write from a Spark Data Frame to a Neo4j database. I will show the configuration […]