Deleting (or accessing) file hangs with 500

[AJamesPhillips]

Related to this forum question about async-lock timed out, I have tried to delete a file and tried to delete its parent directory. The first fails with:

Unable to delete https://ajp.solidcommunity.net/data_curator_v1/world_components.ttl: Error: Web error: 500 (Internal Server Error) on DELETE of https://ajp.solidcommunity.net/data_curator_v1/world_components.ttl

The second (deleting the parent directory) with:

Unable to delete https://ajp.solidcommunity.net/data_curator_v1/: Error: Web error: 500 (Internal Server Error) on DELETE of https://ajp.solidcommunity.net/data_curator_v1/world_components.ttl

[bourgeoa]

@AJamesPhillips
I just intervened on your pod to better understand that problem.

• made a copy of your file world_components.ttl to test.ttl
• added https://bourgeoa.solidcommunity.net/profile/card#me in root .acl

I can display test.ttl an there is an error on line 354
Could you check please.

I have no explanation it will be very helpful if we can track the problem together.

[bourgeoa]

This is your profile. I suppose you flagged it trying to write trusted app localhost:8080
I can rebuild one from an other pod
This is not an explanation for the 500 error

[AJamesPhillips]

Thank you @bourgeoa . Regarding the profile card, I didn't knowingly try to edit that manually (I don't really understand ttl yet). I really have no idea how that got corrupted / malformed?

Regarding the world_components.ttl file. Thank you for copying it to test.ttl. I have backups so it's not a problem. You can see what it should look like in: https://ajp.solidcommunity.net/data_curator_backups/2021-08-24_18-00-12/data_curator_v1/world_components.ttl

The application code I used to write those files is below. I can only imagine the write process is not atomic and got interrupted part way through? I think I only had one browser tab open with the application but if there were two and they performed the write at the same time could that cause it? If I reloaded the page mid write / stream could that have caused it? I'm using @inrupt/solid-client @ 1.11.0

async function save_items <I extends { id: string, title: string }> (items_URL: string, items: I[])
{
    let items_dataset = createSolidDataset()
    items.forEach(item =>
    {
        let thing = createThing({ name: item.id })
        thing = addStringNoLocale(thing, V1.title, item.title)
        thing = addStringNoLocale(thing, V1.json, JSON.stringify(item))
        items_dataset = setThing(items_dataset, thing)
    })


    try {
        // console .log("Saving...")
        // Save the SolidDataset
        /* let saved_items_dataset = */ await saveSolidDatasetAt(items_URL, items_dataset, { fetch: solid_fetch })
        //console .log("Saved!")

        return Promise.resolve()
    } catch (err) {
        console.error(`error saving items to "${items_URL}" :`, err)
        const error: SyncError = { type: "general", message: err }
        return Promise.reject(error)
    }
}

[AJamesPhillips]

Related previous forum post describing something pretty similar. https://forum.solidproject.org/t/unable-to-delete-big-files-from-inrupt-net-pod/4039/5

[bourgeoa]

@AJamesPhillips

• your profile/card has been recreated. Can you check if everything is working correctly.
  I used a copy of ajp2 for that and just changed foaf:name to "AJP"
• It seems to me you could have done that repair directly in dataBrowser. I may be wrong. Will have to check
• Can I manually delete your world_components.ttl ?
• you may remove my webId from root .acl. Use the sharing-pane from the dataBrowser. (https://github.com/solid/userguide/blob/main/views/sharing/userguide.md)

This does not resolve the 500 problem.
I do not understand because your file is small and so there could be lot of issues.
I never saw this problem on small files using https://github.com/jeff-zucker/solid-file-client library.
On big file this happens and it is related to nginx limiting filesize I do not have the problem on my own server. solidcommunity.net is an alpha server not meant for real production.

Please continue to use solidcommunity.net I'm supporting pod repair, this a good way for improvements from last 2-3 years

But the question raised on reloading the page before the process ends maybe ?

[AJamesPhillips]

But the question raised on reloading the page before the process ends maybe ?

This is the only obvious thing that comes to mind for me but perhaps others who know the code base better will have better guesses?

[AJamesPhillips]

Please continue to use solidcommunity.net I'm supporting pod repair, this a good way for improvements from last 2-3 years

I certainly will and thank you for all of your very responsive and excellent help. I need to get something as stable as possible right now so that I can prove to my team that Solid is an ok investment at the moment. If it's not yet ready that's ok but I want to maximise the chance of using anything Solid related which will also maximise the chance of being able to return to solidcommunity.net . Currently it's taken me about a month of lots of trial and most errors so I'm going to stick with inrupt.com for the moment and I'll venture back to the community server when I have more resources 🙂

[AJamesPhillips]

Can I manually delete your world_components.ttl ?

@bourgeoa you are welcome to delete it but do you not want to keep it there to try to debug what's wrong with it / the server? I've got the data on inrupt.com now and it's also backed up locally so if deleting it is the best route for you to fix / debug it then please feel free to do that.

you may remove my webId from root .acl.

For now I will leave you with root access so that you can more easily investigate / add others to investigate.... unless you do not need access any more in which case I can remove you.