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https://issues.apache.org/jira/browse/AMBARI-15919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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DIPAYAN BHOWMICK updated AMBARI-15919:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
Committed to trunk.
> Migrate instance specific data from one version to another.
> -----------------------------------------------------------
>
> Key: AMBARI-15919
> URL: https://issues.apache.org/jira/browse/AMBARI-15919
> Project: Ambari
> Issue Type: Bug
> Components: ambari-views
> Affects Versions: 2.4.0
> Reporter: Gaurav Nagar
> Assignee: Gaurav Nagar
> Fix For: 2.4.0
>
> Attachments: AMBARI-15919_trunk.patch
>
>
> It is critical that we provide a way to migrate instance data and view data
> information between versions of views. We need to support the following use
> case:
> - New version of view is instantiated. Since instance specific data will not
> be available to the new instance of the view (if the version has changed),
> there needs to be a way of migrating existing information over to the new
> view instance.
> - The Ambari view framework needs to provide a facility to invoke call back
> handlers (of sorts) to allow the view itself to handle the migration from and
> older version to the current version.
> An example...
> After a view instance (X1) is created (say from XView 1.0.0), a view might
> use instance data and/or datastore data. When a new view is released (say
> from XView 2.0.0), an ambari admin will want to create a new instance (X2)
> and migrate the data from the existing instance (X1). Ambari should provide a
> mechanism to perform this migration.
> 1) The ambari admin creates new instance X2 in the admin interface.
> 2) The ambari admin can select to migrate data from an existing instance.
> 3) The ambari admin initiates the migration of instance and datastore. The
> ambari views framework starts the processing of instance + datastore data
> movement (copying) to the new X2 instance scope.
> 4) The framework should call into a hook in the view in case any changes are
> needed to the X1 info before they saved in the new X2 instance.
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