IBM WebSphere eXtreme Scale 6电子书

IBM WebSphere eXtreme Scale 6

Table of Contents

IBM WebSphere eXtreme Scale 6

Credits

About the Author

About the Reviewers

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Errata

Piracy

Questions

1. What is a Data Grid

Data grid basics

Getting IBM WebSphere eXtreme Scale

Setting up your environment

Hello, world!

Summary

2. The ObjectMap API

Different kinds of maps

Get and put

Updating objects in the grid

Lock strategies

Lock types

Hash map refresher (or crash course)

Optimistic collisions

Deadlocks

Removing objects

FIFO queues

Unsupported methods

Wrapping up

Summary

3. Entities and Queries

Entities

Defining Entities

Persisting Entities

Composition versus Inheritance

The Find methods

Entity life-cycle states

Merge, remove, and the detached state

Entity relationships

@OneToMany, @ManyToOne

schemaRoot

The Query API

Joins and aggregate functions

IDs and Indexes

Summary

4. Database Integration

You're going where?

Where does an IMDG fit?

JPALoader and JPAEntityLoader

The Loader's job

Performance and referential integrity

Removal versus eviction

Write-through and write-behind

BackingMap and Loader

Picking battles

JPALoader

Summary

5. Handling Increased Load

The building blocks

Shards and partitions

Client/Server ObjectGrid

A basic deployment

Starting a container

Connecting to a distributed grid

Adding more containers

Partition placement

Capacity planning

Hitting the wall

Summary

6. Keeping Data Available

Containers, shards, partitions, and replicas

The foundation

Shards

Map sets

Partitions

Replication

Shard placement

Shard start-up

Lost shards and failover

Physical location

Controlled data separation

Preferred zones

Summary

7. The DataGrid API

What does DataGrid do for me?

Borrowing from functional programming

GridAgent and Entity

GridAgent with an unknown key set

Aggregate results

Using ephemeral objects in agents

Updates with agents

Scheduling agents

Summary

8. Data Grid Patterns

XTP: Extreme Transaction Processing

The data model

Schema root

Reference data and object duplication

How do we duplicate objects?

Time-to-live keeps us out of trouble

Early eviction

Rely on partitions, not the entire grid

One transaction, one node

Object schema denormalization

Summary

9. Spring Integration

Injecting ObjectGrid instances

Spring-managed eXtreme Scale configuration

Transaction management

Basic configuration

ObjectGrid client configuration

Remembering our patterns

Summary

10. Putting It All Together

The bookmarks app

The data model

The service layer

Storing data how it is used

Grid/ORM hybrid

Preloading data

Improving responsiveness

Caching more than ORM

Summary

Index