Are directories "document_preview" and "document_thumbnail" strictly necessary to upgrade to DXP?
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Issue
- During the upgrade, there are usually many thumbnails and previews, which could significantly increase the duration of the upgrade.
Environment
- Liferay DXP 7.0, 7.1, 7.2, 7.3
Resolution
- It's not necessary to copy these directories to new installation.
- In order to avoid high CPU usage and therefore to improve the time of the upgrade process, you can regenerate the previews and thumbnails after the upgrade process.
- Previews will be generated only when the user visits the page where the documents exist.
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