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https://issues.apache.org/jira/browse/NIFI-2146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Payne closed NIFI-2146.
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> When saving flow, NiFi should allow the flow to automatically be backed up
> --------------------------------------------------------------------------
>
> Key: NIFI-2146
> URL: https://issues.apache.org/jira/browse/NIFI-2146
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Configuration, Core Framework, Documentation & Website
> Reporter: Mark Payne
> Fix For: 1.0.0
>
>
> Each time that a user updates the NiFi flow, the new flow is written to the
> flow.xml.gz on each node. When this occurs, we should provide the option of
> also writing the flow.xml.gz to an 'archive' folder, using a filename based
> on the current time. We should also ensure that we keep old flows for X
> (configurable) amount of time and only use a max of some configurable amount
> of disk space.
> StandardXMLFlowConfigurationDAO (in nifi-framework-core) already has a method
> for `save(FlowController controller, boolean archive)` but 'false' is always
> passed as the 'archive' field. We should instead pass in `true` if configured
> to archive.
> Additionally, we should change the archive filename so that it is based on a
> user-readable date/time, such as flow-2016-06-29-11-10-50am.xml.gz, for
> instance, for a flow that was saved at 11:10:50 AM on June 29, 2016. This
> allows an admin to easily revert a flow back to how it was at some point in
> history.
> Changes required to implement this include:
> 1. Update nifi.properties to include new properties (with the suggested
> defaults that may need to be adjusted):
> - nifi.flow.configuration.archive.enabled=true
> - nifi.flow.configuration.archive.max.time=30 days
> - nifi.flow.configuration.archive.max.storage=500 MB
> There already is a property named `nifi.flow.configuration.archive.dir` that
> should be used to specify where to save the archived flow. This is used
> currently only when the user clicks the 'archive' button in the UI.
> 2. Update StandardFlowService.saveFlowChanges(TimeUnit delayUnit, long delay)
> so that it passes a value of `true` for the 'archive' flag when calling the
> overridden saveFlowChanges method in the case that the
> `nifi.flow.configuration.archive.enabled` property is set to true (default).
> 3. Update StandardXMLFlowConfigurationDAO.createArchiveFile() to use a more
> user-friendly filename, as described above.
> 4. Update StandardXMLFlowConfigurationDAO.save() so that the `if (archive) {`
> branch first cleans up old/expired flows so that the `archive` directory is
> smaller than the configured max storage space and so that any archived flow
> that is older than the configured `nifi.flow.configuration.archive.max.time`
> property is removed.
> 5. Update Admin Guide to explain the new properties
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