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 JE HA 



Berkeley DB Java Edition High Availability (JE HA) enables replication of JE
environments.  JE HA is an embedded database management
system designed to provide fast, reliable, and scalable data
management. A JE environment is replicated across the nodes of a
single read/write Master, multiple read only Replica Replication
Group. JE HA is used to improve application availability, provide
improved read performance, and increase data durability.

Getting Started
The 
Replication
Guide is invaluable for understanding the capabilities of JE HA
and how best to design your replicated application.


The
Introduction
covers terminology, the replication group
lifecycle, and the concepts of durability and consistency. Much of the
javadoc refers to the topics covered there.

Replication
API First Steps explains how to configure and start a replication
group.

Transaction Management
 highlights the tradeoffs that must be considered in a replicated
application and provides some use cases.

In addition, the 
je.rep.quote example
package provides three example replication applications.

What the com.sleepycat.je.rep package contains
Replication control

 ReplicatedEnvironment is the main access point to
 replication.
 ReplicationConfig and
 ReplicationMutableConfig specify attributes of the
 replication system.

Administration

 
 ReplicationNode and ReplicationGroup supply
 administrative views of the replication system.
 

Support

 
 StateChangeListener and StateChangeEvent
 implement a Listener pattern for tracking changes in the replication system.
 
 
 CommitPointConsistencyPolicy,
 TimeConsistencyPolicy and
 NoConsistencyPolicy let the user control the read only
 replica's view of the the replicated data.
 
 
 ReplicatedEnviromentStats provide feedback on system execution.
 


Related Packages


com.sleepycat.je.rep.monitor lets the application track
the replication system in order to do tasks such as load balancing and
write request routing.


com.sleepycat.je.rep.util provides command line and
programmatic APIs for administering and starting up a replication
system.


Related Documentation
@see Replication Guide
@see 
 JE HA Examples