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Presented @ Adobe, Bangalore - Introduction to the Node State Model in Jackrabbit OAK
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JackRabbit OAK
Yash Mody, PhD CTO | Tekno Point Consulting
www.teknopoint.us
Introducing the “oak”
Hierarchical Content repository New age CMS – distributed, loosely couples, multiplatform solution JCR Compliant (not full coverage) Scalable (>100 M nodes) Cloud Deployments
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Architecture
.NodeStore
.MicroKernel (MK)
.NodeState
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Overview
OAK JCR
OAK CORE
OAK PLUGINS
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Layers Light wt HTTP protocol for JSON
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The Node store architecture
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fundamentals
Hierarchical/Tree Model with nodes and properties Everything else is plugin based Tree is immutable, changes are new revisions
Multi Version Concurrency Control (MVCC) model
Snapshot Isolation Relaxed first committer wins strategy Write Skew (ex: joint accounts)
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Node state Model
Node – unordered collection Content revisions will change states of Nodes Node State is an immutable snapshot of a specific state NodeState and NodeBuilder Interfaces
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Node store
Implementation of Node State Model Java API for NSM functionality
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Microkernel
NSM implementation with String only JSON API Remoteable Stateless 2 flavors of MK: Document and Segment
Document – Max performance in stand alone systems Segment – Max Scalability for cluster
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Other stuff
Compare NodeState Commit Hooks – controls/modifies what to do with a commit Commit Editors – parallel processing of multiple hooks Commit Validators – only validates. Cannot modify
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Thanks
@yash_mody http://www.linkedin.com/in/modyyash
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