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When you deploy an application, you can also specify an edition description next to the edition name, which gives you the ability to store more information.Non-destructive updateThe existing application installation and update functions in Network Deployment are destructive. That is, they replace the old instance of the application with a new instance. Installing an application edition is non-destructive. You can install any number of application editions and keep them in the system management repository.StateEach application edition that is deployed has a statethat identifies the status of the application edition. Each application edition must be in one of the following states or modes:ActiveInactiveValidationBecause the application edition changes from one state to another, various actions occur, such as installing, validating, activating, running a rollout, deactivating, and uninstalling. After installing a new edition of an application, the new edition is only activated if there is not already an active edition deployed to the same cluster. For each application and deployment target combination, there can be at most one edition in active mode and one edition in validation mode. An edition that is in the inactive state is not started when an application server starts.
140WebSphere Application Server V8.5 Concepts, Planning, and Design Guide5.6.3 ConceptsThe application edition management feature provides the following capabilities:Rolloutindicates policies that allow you to switch from one edition to another edition with no loss of service.Concurrent activationwhere multiple editions can be concurrently active for an extended period.A validation modeto send selective traffic to verify the correct operation.Rollout Rollout activation activates one edition in place of another, ensuring an interruption-free update in the process. Thus, all application requests are serviced during the rollout and none are lost. This process ensures continuous application operation from the perspective of the customers of that application. To do so, the application edition manager carefully coordinates the activation of the edition and the routing of requests to the application.During rollout, you make the following choices:Soft or hard rolloutA soft rollout stops and starts only the application, whereas a hard rollout stops and starts the application server. You might consider a hard rollout if an application must reload native code.Atomic or group rolloutAn atomic rollout ensures that two editions do not service requests at the same time, whereas a group rollout does not ensure this. The atomic rollout can queue requests briefly in the ODR to ensure atomicity. A group rollout does not queue requests.
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