docs/mkdocs/docs/advanced.md

description
Collection of advanced concepts and debug info.

Advanced Notes

!!! warning "Check Your Backups" As a general rule of thumb, make sure your backups are up to date before continuing with anything here.

A loose collection of advanced debug info and actions for experienced users for troubleshooting and resolving issues. The situation or command may or may not apply to you, so only use this when you know what you are doing or as directed. Some of the below functionality might get implemented in the future in the regular UI.

Reactivate documents

As part of the metadata refresh task, Tube Archivist will mark videos, channels and playlists as deactivated if they are no longer available on YouTube. Sometimes, they may be marked as deactivated when they shouldn't have, for example if a video got reinstated after a copyright strike on YT. You can reactivate all items in bulk so the refresh task will check them again and deactivate the ones that are actually not available anymore.

Curl commands to run within the TA container to reactivate documents:

??? bug "Videos"

```bash
curl -XPOST "$ES_URL/ta_video/_update_by_query?pretty" -u elastic:$ELASTIC_PASSWORD -H "Content-Type: application/json" -d '
{
"query": {
	"term": {
		"active": {
			"value": false
		}
	}
},
"script": {
	"source": "ctx._source.active = true",
	"lang": "painless"
}
}'
```

??? bug "Channels"

```bash
curl -XPOST "$ES_URL/ta_channel/_update_by_query?pretty" -u elastic:$ELASTIC_PASSWORD -H "Content-Type: application/json" -d '
{
"query": {
	"term": {
		"channel_active": {
			"value": false
		}
	}
},
"script": {
	"source": "ctx._source.channel_active = true",
	"lang": "painless"
}
}'
```

??? bug "Playlists"

```bash
curl -XPOST "$ES_URL/ta_playlist/_update_by_query?pretty" -u elastic:$ELASTIC_PASSWORD -H "Content-Type: application/json" -d '
{
"query": {
	"term": {
		"playlist_active": {
			"value": false
		}
	}
},
"script": {
	"source": "ctx._source.playlist_active = true",
	"lang": "painless"
}
}'
```

Corrupted ES index reset

After a hard reset of your server, or any other hardware failure, you might experience data corruption. ES can be particularly unhappy about that, especially if the reset happens while it is actively writing to disk. It's very likely that only your /indices folder got corrupted, as that is where the regular read/writes happen. Luckily you have your snapshots set up.

!!! warning Confirm you have an available, recoverable snapshot prior to performing this action.

ES will not start, if the data is corrupted. So, stop all containers, delete everything except the /snapshot folder in the ES volume. After that, start everything back up. Tube Archivist will create a new blank index. All your snapshots should be available for restore on your settings page, you probably want to restore the most recent one. After restore, run a filesystem rescan for good measure.

ES mapping migrations troubleshooting

Tube Archivist will apply mapping changes at application startup for certain versions. That usually is needed when changing how an existing field is indexed. This action should be seamless and automatic, but can leave your index in a messed up state if that process gets interrupted for any reason. Common reasons could be that if you artificially limit the memory to the container, disabling the OS to dynamically manage that, or if you don't have enough available storage on the ES volume, or if you interrupt that because of your impatience (don't do that).

In general the process is:

1. Compare existing mapping with predefined expected mapping
   1. If that is identical, there is nothing to do
2. Else create a _backup of the existing index
3. Delete the original index and create a new empty one with the new mapping in place
4. Copy over the previously created _backup index to apply the new mappings
5. Delete the now leftover _backup index.

If you are not sure if anything is happening, you can monitor your index and docs.count value for each index. Those values should change over time during the process and you should get an indicator of progress happening:

From within the ES container:

curl -u elastic:$ELASTIC_PASSWORD "localhost:9200/_cat/indices?v&s=index"

If that process gets interrupted before deleting the _backup index and you try to run this again, you will see an error like resource_already_exists_exception, for example index [ta_comment_backup/...] already exists indicating in this case that your migration previously failed for the ta_comment index.

First, make sure you still have the original index with the command above. After verifying, stop the TA container, then you can delete the _backup index, e.g. in the case of ta_comment_backup.

curl -XDELETE -u elastic:$ELASTIC_PASSWORD "localhost:9200/ta_comment_backup?pretty"

and you should get:

{
  "acknowledged" : true
}

Then you can restart the container and the migration will run again. If your error persists, the ES and TA logs should give additional debug info.

Manual yt-dlp update

!!! warning Doing this is very likely going to break things for you. You will want to try this out on a testing instance first. Regularly there have been subtle changes in the yt-dlp API, so only do this if you know how to debug this project by yourself, but obviously share your fixes so any problems can be dealt with before release. This project strives for timely updates when yt-dlp makes a new release, but sometimes ideals meet reality. Also, sometimes yt-dlp has a fix published, but not yet released.

Build your own image: Update the version in requirements.txt and rebuild the image from Dockerfile. This will use your own image, even on container rebuild.

Update yt-dlp on its own: You can also update the yt-dlp library alone in the container.

• Restart your container for changes to take effect.
• These changes won't persist a container rebuild from image.

Update to newest regular yt-dlp release:

pip install --upgrade yt-dlp

To update to nightly you'll have to specify the correct --target folder:

pip install \
    --upgrade \
    --target=/root/.local/bin \
    https://github.com/yt-dlp/yt-dlp/archive/master.tar.gz

This is obviously particularly likely to create problems. Also note that the --version command will only show the latest regular release, not a nightly version mentioned.

Erase errors from download queue

Sometimes videos will fail to download. That can be because of expected errors:

• A video is no longer available for download.

That is not recoverable.

Other kind of errors are recoverable, for example:

• You got temporarily rate limited.
• Your internet connection dropped out.

Failed downloads won't get retried again as they require your intervention. You can click on Download Now on a video in the queue to verify, if a video became available again.

If you know that all errors are resolved you can bulk clear. Run this from within the TA container:

???+ bug "Erase Errors" bash curl -X POST "$ES_URL/ta_download/_update_by_query?pretty" -u elastic:$ELASTIC_PASSWORD -H 'Content-Type: application/json' -d' { "script": { "source": "ctx._source.message = null", "lang": "painless" }, "query": { "match_all": {} } } '