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Updated Filer Metadata Events (markdown)

Chris Lu 2022-03-29 02:03:19 -07:00
parent 28f2ba2edf
commit 5c3d197127
1 changed files with 7 additions and 6 deletions
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Filer-Metadata-Events.md

@ -81,10 +81,11 @@ The `SubscribeMetadataResponse` contains `EventNotification`, which contains `ol
* Update Event: `old_entry` is not null, and `new_entry` is not null.
* Rename Event: similar to Update Event, but also need `SubscribeMetadataResponse.directory` and `EventNotification.new_parent_path`.
## Purging Metadata
It is safe to delete the metadata files for now. However, future development will rely on these metadata events to implement new features, such as:
* Async filer replication (to replace existing dependency on other message queue, e.g., Kafka)
* Recover deleted files
* Snapshot
## Purging Metadata Logs
It is ok to delete the metadata logs. However, many features rely on these metadata events, such as:
* Async filer replication
* Sync metadata with `weed mount`
* Async filer metadata backup
* Filer backup
The metadata should not take too much space. Just leave it there.
So better not to mess with the metadata logs, which should not take too much space. Just leave them there.