Walkthrough Neo4j 1.9 & 2.0
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This webinar covered Neo4j 1.9.1, 2.0 features and hands-on demonstrations. Key highlights included: - Neo4j 1.9.1 improvements to high availability, operations and Cypher performance. - Neo4j 2.0 introduces node labels for improved querying and indexing, transactional Cypher via REST, and a focus on using Cypher everywhere. - Hands-on sessions demonstrated migrating data to use labels, indexing, transactional HTTP endpoint, and other new 2.0 features.
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Walkthrough Neo4j 1.9 & 2.0
- 1. Webinar June 25 2013 Walkthrough Neo4j 1.9.1 & 2.0 Michael Hunger, Neo Technology @mesirii
- 2. Overview
- 3. Overview • Neo4j 1.9.1 • High Availability & Operations • Performance & Cypher • Neo4j 2.0 • Extension Property Graph Model - Labels & Indexes • Cypher • Transactional Http Endpoint
- 4. Neo4j 1.9.1
- 5. High Availability & Operations • new HA cluster management implementation (paxos) w/o ZK • ZK compatibility layer for rolling upgrades from 1.8 • faster consistency check with new implementation • new HA JMX information -> JConsole • Arbiter instance for clusters < 3 • Slave only mode • new endpoint for load balancers /db/manage/server/ha/{master,slave}
- 6. Hands-On High Availability • Manual 1.8 vs. Manual 1.9 • Live • 3 node cluster • runs without zookeeper • show that replication works • show management endpoint and JMX • show config
- 7. General • Java 7 support • Store-Locks to limit access of Readonly-Instances • Online backup enabled by default, works with port-range • Performance • caching & property access improvements • REST-Batch-Operations speedup
- 8. Server • Traversal Javascript is sandboxed • X-Forwarded-Host and X-Forwarded-Proto headers to support running behind a proxy • SSL certificate chain support • REST-batch-operations performance improvements • Gremlin plugin as separate project • to allow different versions and decouple from neo4j release cycle
- 9. Cypher • upgrade to scala 2.10 • concurrent parsing • execution plan description • fix non-lazyness • faster pattern matcher (bi-directional traversal) • top-n select for order by limit
- 10. Cypher • predicates as expressions • Functions: reduce, string functions • order by, skip, limit with WITH • automatic conversion • SET can work with other nodes or maps
- 11. Hands-On Cypher • profiling • string functions, show reduce • WITH with ORDER BY LIMIT • SET with predicates, SET with other nodes • FOREACH with CREATE UNIQUE
- 12. Why 2.0?
- 13. (0.x) --> (1.x) --> (2.x)
- 14. (0.x) --> (1.x) --> (2.x) • 0.x was about embedded java
- 15. (0.x) --> (1.x) --> (2.x) • 0.x was about embedded java • 1.x introduced indexes, the server and REST
- 16. (0.x) --> (1.x) --> (2.x) • 0.x was about embedded java • 1.x introduced indexes, the server and REST • 2.x ease of use, big data, cloud
- 17. (0.x) --> (1.x) --> (2.x) • 0.x was about embedded java • 1.x introduced indexes, the server and REST • 2.x ease of use, big data, cloud which means a focus on...
- 18. This guy
- 19. Focus on Cypher
- 20. Focus on Cypher • Cypher, a carefully crafted language for working with graphs
- 21. Focus on Cypher • Cypher, a carefully crafted language for working with graphs • Declarative, friendly, easy to read and write
- 22. Focus on Cypher • Cypher, a carefully crafted language for working with graphs • Declarative, friendly, easy to read and write • One language, used everywhere
- 23. Focus on Cypher • Cypher, a carefully crafted language for working with graphs • Declarative, friendly, easy to read and write • One language, used everywhere • REST for management, Java for extensions,
- 24. What is new in 2.0?
- 25. There will be some sad Danes "Once you label me, you negate me.” - Søren Kierkegaard
- 26. Introducing Node Labels name: 'Soren'
- 27. • Simply: a label identifies a set of nodes Introducing Node Labels name: 'Soren'
- 28. • Simply: a label identifies a set of nodes Introducing Node Labels name: 'Soren' Dane
- 29. • Simply: a label identifies a set of nodes • Nodes can have multiple labels Introducing Node Labels name: 'Soren' Dane
- 30. • Simply: a label identifies a set of nodes • Nodes can have multiple labels Introducing Node Labels name: 'Soren' Negated Dane
- 31. • Simply: a label identifies a set of nodes • Nodes can have multiple labels Introducing Node Labels name: 'Soren' Negated name: 'Soren' img: Dane
- 32. • Simply: a label identifies a set of nodes • Nodes can have multiple labels • Find nodes by label Introducing Node Labels name: 'Soren' Negated name: 'Soren' img: Dane
- 33. • Simply: a label identifies a set of nodes • Nodes can have multiple labels • Find nodes by label • Constrain properties and values (lightweight, optional schema) Introducing Node Labels name: 'Soren' Negated name: 'Soren' img: Dane
- 34. • Simply: a label identifies a set of nodes • Nodes can have multiple labels • Find nodes by label • Constrain properties and values (lightweight, optional schema) • A simple idea, with powerful applications Introducing Node Labels name: 'Soren' Negated name: 'Soren' img: Dane
- 35. Find friends who like cheese MATCH (max:People)-[:FRIENDS]->(cheesy: People), (cheesy)-[:LIKE]->(cheese:Things) WHERE max.name = "Max De Marzi" AND cheese.name = "Cheese" RETURN cheesy;
- 36. Schema Indexing • Indexes for labels, based on a property • Simple lookups for now • Unique indexing coming soon • Full-text, other special indexes in planning CREATE INDEX ON :People(name)
- 37. MERGE operation • a combination of MATCH + CREATE • replaces CREATE UNIQUE • attempts to MATCH, with specified properties and labels • if match fails, new graph data is created • optional sub-clauses for handling ON CREATE, and ON MATCH MERGE (charlie { name:'Charlie Sheen', age:10 }) ON CREATE charlie SET charlie.created = timestamp() RETURN charlie
- 39. • begin, commit, or rollback a transaction Transactional Cypher
- 40. • begin, commit, or rollback a transaction • transaction as RESTful resource Transactional Cypher
- 41. • begin, commit, or rollback a transaction • transaction as RESTful resource • issue multiple statements per request Transactional Cypher
- 42. • begin, commit, or rollback a transaction • transaction as RESTful resource • issue multiple statements per request • multiple requests per transaction Transactional Cypher
- 43. • begin, commit, or rollback a transaction • transaction as RESTful resource • issue multiple statements per request • multiple requests per transaction • compact response format Transactional Cypher
- 44. • begin, commit, or rollback a transaction • transaction as RESTful resource • issue multiple statements per request • multiple requests per transaction • compact response format Transactional Cypher
- 45. Anything else?
- 46. Anything else? • Performance improvements
- 47. Anything else? • Performance improvements • Breaking changes to some APIs (read CHANGES.txt)
- 48. Anything else? • Performance improvements • Breaking changes to some APIs (read CHANGES.txt) • Migration of "legacy" indexes (stop STARTing)
- 49. Anything else? • Performance improvements • Breaking changes to some APIs (read CHANGES.txt) • Migration of "legacy" indexes (stop STARTing) • Mandatory transactions for all DB interactions
- 50. Anything else? • Performance improvements • Breaking changes to some APIs (read CHANGES.txt) • Migration of "legacy" indexes (stop STARTing) • Mandatory transactions for all DB interactions • Improving installers (in progress)
- 51. Anything else? • Performance improvements • Breaking changes to some APIs (read CHANGES.txt) • Migration of "legacy" indexes (stop STARTing) • Mandatory transactions for all DB interactions • Improving installers (in progress) • Changing everything to be "all Cypher, all the time"
- 52. How to use labels?
- 53. Label - special nodes • replace built-in reference node, with domain specific reference nodes 42
- 54. Label - special nodes • replace built-in reference node, with domain specific reference nodes 42 Answer
- 55. Labels - rules of thumb
- 56. Labels - rules of thumb • Use a label to make queries easier to read & write
- 57. Labels - rules of thumb • Use a label to make queries easier to read & write • And to improve performance through indexing
- 58. Labels - rules of thumb • Use a label to make queries easier to read & write • And to improve performance through indexing
- 59. Labels - rules of thumb • Use a label to make queries easier to read & write • And to improve performance through indexing • Start with anything you might've put in a legacy index
- 60. Labels - rules of thumb • Use a label to make queries easier to read & write • And to improve performance through indexing • Start with anything you might've put in a legacy index • Use lightly, as few labels as needed
- 61. Hands-On Cypher • Migrate Cineasts dataset to use Labels • Show MATCH on Labels and Properties (+ profile) • Add an Index on :Person(name) :Movie(title) • Show MATCH on Labels and Properties (+ profile) • Show MERGE
- 62. Hands-On 2.0 • Show Transactional HTTP-Endpoint • POST initial statements, look at result, check currently running tx in server-info • POST another create statement to the tx • POST a new read statement to a new tx that shows isolation • DELETE second transaction • POST to COMMIT resource
- 63. Is that it for 2.0?
- 64. Well, there is this...
- 65. Googlehttp://localhost:7474/ Neo4j LoadTransactions Neo4j 2.0.0 Active Queries 12Master /var/neo4j/webui.graphdb Active Queries 12 MATCH (n)-[:FRIEND]->(friends) WHERE n.name = 'Andreas'Create a blank node CREATE (n); Clear all MATCH (n)-[r?]->(m) DELETE n,r,m; ad-hoc query Relate People MATCH (from),(to) WHERE n.name = {from} AND to.name = {to} CREATE (from)-[:FRIEND]- >(to); Delia Andreas m People CREATE (n); Andreas Name Metaphysical Mood Delia Excited Friends by name CREATE (n); Andreas From Delia To Delia Tiberius Mood survey CREATE (n); Andreas Name Metaphysical Mood Delia Excited MATCH (n) RETURN n People Books ClassicsAuthors CREATE (me:People {name:'Andreas'})
- 66. What is new in 2.0?
- 67. What is new in 2.0? • It's all about Cypher, starting with • Labels, the first significant change in over 12 years • Mix in schema indexing • Then transactional REST, new clauses, functions • A fresh Web UI that is Cypher-focused
- 68. Thanks :) MATCH (you)-[:HAVE]->(question) RETURN question.text @neo4j or @mesirii to keep in touch