seaweedfs/weed/filer/arangodb/readme.md

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##arangodb
database: https://github.com/arangodb/arangodb
go driver: https://github.com/arangodb/go-driver
options:
```
[arangodb]
enabled=true
db_name="seaweedfs"
servers=["http://localhost:8529"]
#basic auth
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user="root"
pass="test"
# tls settings
insecure_skip_verify=true
```
i test using this dev database:
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`docker run -p 8529:8529 -e ARANGO_ROOT_PASSWORD=test arangodb/arangodb:3.9.0`
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## features i don't personally need but are missing
[ ] provide tls cert to arango
[ ] authentication that is not basic auth
[ ] synchronise endpoint interval config
[ ] automatic creation of custom index
[ ] configure default arangodb collection sharding rules
[ ] configure default arangodb collection replication rules
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## complexity
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ok, so if https://www.arangodb.com/docs/stable/indexing-index-basics.html#persistent-index is correct
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O(1)
- InsertEntry
- UpdateEntry
- FindEntry
- DeleteEntry
- KvPut
- KvGet
- KvDelete
O(log(BUCKET_SIZE))
- DeleteFolderChildren
O(log(DIRECTORY_SIZE))
- ListDirectoryEntries
- ListDirectoryPrefixedEntries