RSS feeds timestamp not matching timestamp when dataset updated

[emmerbodc]

Describe the bug
The RSS feed timestamp doesn't match when the dataset got updates

To Reproduce
Steps to reproduce the behavior:

1. Go to https://linkedsystems.uk/erddap/tabledap/Ziggy_670_R.html
2. Click on https://linkedsystems.uk/erddap/rss/Ziggy_670_R.rss
3. Scroll down to
   Mon, 30 Dec 2024 08:33:57 GMT
   <title>This dataset changed 2024-12-30T08:33:57Z</title>
4. See error - The dataset updated on 02-Jan-2025 07:33 but the RSS feed dataset timestamp is behind a few days.

Expected behavior
I expect the RSS timestamp to match the timestamp of when the dataset updated.

Screenshots
If applicable, add screenshots to help explain your problem.

Server

• ERDDAP, Version 2.25

Desktop (please complete the following information):

• Windows
• Browser - Chrome

[ChrisJohnNOAA]

Currently the rss is updated when the dataset is reloaded. For datasets using file updates, I do think it should be updated when a file changes. I'll look into adding that.

I also want to make sure the current updates are happening properly.

What is reloadEveryNMinutes set to for that dataset? If that is a very large number, you should be able to improve the rss generation by lowering it (until a version of ERDDAP is available with a fix).
Are you using the new SAX parser (true in setup.xml)?
Are you using the shared watch service (true in setup.xml)?

[thogar-computer]

Cheers, @ChrisJohnNOAA, for the reply.

We don't currently have those fields (SAX/shared watch) set in our setup.xml, so it looks like we are a little behind in that regard.

We have reloadEveryNMinutes set at 10080. we can look to reduce that.

[ChrisJohnNOAA]

SAX and shared watch are optional. In 2.25_1, shared watch is defaulted to on. I was asking mostly to make sure I know what code paths you are using.

As for the change to reloadEveryNMinutes, that is a temporary fix. I intend to have the update logic update the RSS feed in 2.26.