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server/internal/registry: reintroduce pruning on model deletion (#9489)

frostbyte_neo 发布于 2025-03-04 03:11:16 +00:00
This reintroduces aggressive pruning on model deletion as a temporary
measure until a more controlled garbage collection (GC) mechanism is
implemented.

Issues with the current approach:
1. Users may accidentally delete a model (ollama rm llama3.3 instead
  of ollama rm llama3.2), requiring a full re-download unless another
  model references the same blobs.
2. Users may assume a deleted model is still referenced elsewhere, but
  due to prior updates or deletions, the references no longer exist,
  leading to unnecessary re-downloads.
Soon, we should implement a structured GC mechanism to retain
unreferenced blobs for a configurable period before removal, which will
run on "ollama rm" and other commands we deem appropriate.

Users that want to immediately remove unreferenced blobs can use a new
prune command that will allow them to specify the age and class of blobs
to remove.

Example usage:
```
# Run basic blob GC
$ ollama prune

# Remove unreferenced blobs older than 7 days
$ ollama prune --age 7d

# Remove all blobs, referenced or not, older than 7 days (and their manifests?)
$ ollama prune --age 7d --all

# Remove all unreferenced blobs immediately
$ ollama prune --age 0 --all

# Remove all blobs
$ ollama prune --age 0 --all
```
This should provide a safer and more predictable cleanup process.
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server/internal/registry: reintroduce pruning on model deletion (#9489)