HA_Cascade

This sample demonstrates how to use cascade replication in eXtremeDB High Availability. The master application creates and populates the database, then enters a loop creating and deleting objects as it waits for connection requests from replicas. The hacascade-rplmst application connects to the "master" and synchronizes with the master database. At the same time hacascade-rplmst works as a master, i.e. waits for connections from other replicas on port 20000. (Note that WRITE transactions are not allowed, because it is a replica for "master".)

How to Run

See instructions here on how to build this and other samples on your development platform. Once built, the sample can be run from the \target\bin directory.

In a console window run:

 
    hacascade_master
     

Then run one or several "replica" applications:

 
    hacascade_rplmst
 

Then run one or more "replica" applications, that connect to rplmst and synchronize with its database:

 
    hacascade_replica
 

Note that the database updates from the hacascade_master go to hacascade_rplmst and then to the second-level hacascade_replica applications.

But it is more instructive to run one instance in your development environment debugger, stepping through the code.

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