7.13.4. Upgrading or Updating your JVM

When upgrading your JVM version or installation, care should be taken as changing the JVM will momentarily remove and replace required libraries and components which may upset the operation of Tungsten Cluster while the upgrade or update takes place.

For this reason, JVM updates or changes must be treated as an OS upgrade or event, requiring a Primary switch and controlled stopping of services during the update process.

A sample sequence for this in a 3-node cluster is described below:

Step Description Command host1 host2 host3
1 Initial state   Primary Replica Replica
2 Stop all services on host2. stopall Primary Stopped Replica
3 Update the JVM   Primary Stopped Replica
4 Start all services on host2 Replica. startall Primary Replica Replica
5 Stop all services on host3. stopall Primary Replica Stopped
6 Update the JVM   Primary Replica Stopped
7 Start all services on host3 Replica. startall Primary Replica Replica
8 Stop all services on host1. stopall Stopped Replica Replica
9 Update the JVM   Stopped Replica Replica
10 Start all services on host1 Primary. startall Primary Replica Replica

The status of all services on all hosts should be checked to ensure they are running and operating as normal once the update has been completed.