Neo4j meets Cassandra :)

Hi!

  • Computer Engineer
  • Programming
  • Electronics
  • Math <3 <3
  • Physics
  • Lego
  • Meetups
  • Animals
  • Coffee
  • GIFs

Graphs are everywhere

We had a talk about MongoDB + Neo4j

Cassandra!

A short intro about Cassandra

Cassandra's data Model

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App

Cassandra + Neo4j <3

  • Recommendation systems
  • Relationships discovery
  • Optimised paths

neo4j-cassandra-connector

https://github.com/hannelita/neo4j_doc_manager

Main challenge:

Flexibility over mapping via configuration file

CREATE TABLE playlist.statistics:
    counter_name text PRIMARY KEY: {i}
    counter_value counter: {p}
CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})

Get a Cassandra Schema

Specify which are properties, or nodes or relationships

{ } => customisable mapping

Each row will be turned into a node

Project Style

CREATE TABLE playlist.statistics:
    counter_name text PRIMARY KEY: {i}
    counter_value counter: {p}
CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})

Node Labels

Project Style

CREATE TABLE playlist.statistics:
    counter_name text PRIMARY KEY: {i}
    counter_value counter: {p}
CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})

Node Properties:

flexible

Project Style

CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})
CREATE TABLE playlist.track_by_id:
    track_id uuid PRIMARY KEY: {u}
    artist text: {r}
    genre text: {p}
    music_file text: {p}
    track text: {p}
    track_length_in_seconds int: {p}

Relationship

Project Style

CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})
CREATE TABLE playlist.track_by_id:
    track_id uuid PRIMARY KEY: {u}
    artist text: {r}
    genre text: {p}
    music_file text: {p}
    track text: {p}
    track_length_in_seconds int: {p}

Relationship

Project Style

CREATE TABLE playlist.track_by_artist:
    artist text: {r}
    track text: {p}
    track_id uuid: {i}
    genre text: {p}
    music_file text: {p}
    starred boolean: {p}
    track_length_in_seconds int: {p}
    PRIMARY KEY (artist {i}, track {p}, track_id {i})
CREATE TABLE playlist.track_by_id:
    track_id uuid PRIMARY KEY: {u}
    artist text: {r}
    genre text: {p}
    music_file text: {p}
    track text: {p}
    track_length_in_seconds int: {p}

Uniques and Indexes

Project Style

CREATE TABLE playlist.playlist_tracks:
    username text: {p}
    playlist_name text: {p}
    sequence_no timestamp: {p}
    artist text: {r}
    genre text: {p}
    track_id uuid: {i}
    track_length_in_seconds int: {p}
    track_name text: {p}
    PRIMARY KEY ((username {p}, playlist_name {p}) {p}, sequence_no {p})

Also works for inline schema 

Challenges

  • Parsers!
  • Data Structures
  • Keep code healthy
  • Levels of flexibility
  • Performance!
  • Open Source! :)

Further work

  • Make it smarter
  • Inference for the schema
  • Query Optimizer

Special Thanks

  • @lyonwj
  • @mesirii (Michael Hunger) and @ryguyrg
  • @neo4j
  • @lafp, @romulostores and @pedrofelipee (GIFs)

Thank you :)

Questions?

 

hannelita@gmail.com

@hannelita

Neo4j meets Cassandra :)

By Hanneli Tavante (hannelita)

Neo4j meets Cassandra :)

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