Can anybody explain the Thumbnail generation over all?

HCL Connections Connections Forum
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Hi everyone,

I'm troubleshooting thumbnail generation in the moment and use this document: https://help.hcl-software.com/connections/v7/admin/troubleshoot/r_troubleshooting_media_thumb.html

Until now I thought thumbnails are generated by the files application (wsadmin commands are running from that application) and that thumbnails are generated without the installation of HCL Connections Docs.

Like File preview there are 3 different processes, one for images (png, jpg and so on), one for pdf and one for office documents.

Afaik the thumbnails from images always appear, pdf works often before office documents and if all is working, the office documents generate a preview too. That's just found out over the years, but never dived deep into that. Related to that task is the exporter binary in oiexport (which is used from /search for file conversion to extract text too).

When I read the above mentioned document, there is a part:

Changing event generation rate

The default rate for generation is one event very two seconds. This rate is based on a 24-cores conversion configuration. For example, if there are six conversion servers, with four 4 cores each (as recommended by HCL Docs), so there are 6*4=24 cores for conversion.

To change the conversion rate, take the following steps:
Why is Docs and Conversion mentioned here? Does the process of thumbnail generation change when docs is enabled in LotusConnections-config.xml?
Is there any more detail available about the process? Back to the generation rate, what happens when files is creating these events for thumbnail generation? Which process consumes that events and does the generation? When the conversion rate is increased, which processes needs to be monitored to be sure that all other processes have enough memory and cpu?
Any hint on each of the topics appreciated! Thanks in advance.
Stoeps
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Hi Christoph,

Thanks for the post - is there an overall issue you're trying to address? Unfortunately I'm not aware of anything more specific than what you've found, but we can certainly research/investigate and provide more input based on what you're trying to achieve.

Thank you,
Michael Montani
HCL Support

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Thanks Michael,

First of all I want to speed up a GenerateAllThumbnails, but with this description I can’t see which AppServer will handle the requests. The provided sql does not contain pdf and these thumbnails are missing for example. So from experience and try and error I assume there are different services involved.

But I will start debugging and tracing globally and refine to find that out.

Regards
Christoph