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A new feature of IBM WAS ND V6 is the application rollout update which allows to sequentially update an application on different nodes. So, you can only use this function if your cluster members are configured on at least two nodes (horizontal scaling).
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This function requires at least WebSphereV6.0.1.2 or V6.0.2. |
The rollout update is a good solution for bugfix type application updates. Upgrade type updates can also use the rollout update function if the application is able to handle changes to the persistence layer gracefully, as explained in 5.2.1, Persistence layer. If this is not the case, then use the application update approach documented in 5.4.3, Update types: major release or upgrade.
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Attention: Also for the rollout update, be aware of the correlation between the Web server plug-in retry interval and the time it takes to stop and restart the appservers for the application update. If your retry interval is too high, then the rollout update might lead to failed requests, especially in an environment with only two nodes. Before using this function, you should, therefore, verify your configuration settings and test the rollout update in a meaningful non-production environment. See 4.2, Starting or stopping appservers and the Web server plug-in retry interval for details. |
