Neo4j: Cypher – Detecting duplicates using relationships

I’ve been building a graph of computer science papers on and off for a couple of months and now that…

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Neo4j vs Relational: Refactoring – Extracting node/table

In my previous blog post I showed how to add a new property/field to a node with a label/record in…

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Neo4j: A procedure for the SLM clustering algorithm

In the middle of last year I blogged about the Smart Local Moving algorithm which is used for community detection…

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Clojure: First steps with reducers

I’ve been playing around with Clojure a bit today in preparation for a talk I’m giving next week and found…

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Neo4j: Specific relationship vs Generic relationship + property

For optimal traversal speed in Neo4j queries we should make our relationship types as specific as possible. Let’s take a…

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Hadoop: HDFS – java.lang.NoSuchMethodError: org.apache.hadoop.fs.FSOutputSummer.(Ljava/util/zip/Checksum;II)V

I wanted to write a little program to check that one machine could communicate a HDFS server running on the…

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R: Querying a 20 million line CSV file – data.table vs data frame

As I mentioned in a couple of blog posts already, I’ve been exploring the Land Registry price paid data set…

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SparkR: Add new column to data frame by concatenating other columns

Continuing with my exploration of the Land Registry open data set using SparkR I wanted to see which road in…

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Unix: Redirecting stderr to stdout

I’ve been trying to optimise some Neo4j import queries over the last couple of days and as part of the…

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