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86 lines
2.1 KiB
Markdown
86 lines
2.1 KiB
Markdown
##arangodb
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database: https://github.com/arangodb/arangodb
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go driver: https://github.com/arangodb/go-driver
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options:
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```
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[arangodb]
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enabled=true
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db_name="seaweedfs"
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servers=["http://localhost:8529"]
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#basic auth
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user="root"
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pass="test"
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# tls settings
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insecure_skip_verify=true
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```
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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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## database structure
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arangodb has a few restrictions which require the use of a few tricks in order to losslessly store the data.
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### filer store
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arangodb does not support []byte, and will store such as a uint64 array. this would be a waste of space. to counteract this, we store the data as a length prefixed uint64 byteset.
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### filer kv
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same as above
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### filer buckets
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s3 buckets are implemented through arangodb collection. this allows us to do very fast bucket deletion by simply deleting the collection
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arangodb collection name rules is character set `azAZ09_-` with a 256 character max. however the first character must be a letter.
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s3 bucket name rule is the set `azAZ09.-` with a 63 characters max.
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the rules for collection names is then the following:
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1. if the bucket name is a valid arangodb collection name, then nothing is done.
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2. if the bucket name contains a ".", the "." is replaced with "_"
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3. if the bucket name now begins with a number or "_", the prefix "xN--" is prepended to the collection name
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this allows for these collection names to be used.
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## features i don't personally need but are missing
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[ ] provide tls cert to arango
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[ ] authentication that is not basic auth
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[ ] synchronise endpoint interval config
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[ ] automatic creation of custom index
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[ ] configure default arangodb collection sharding rules
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[ ] 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)
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- InsertEntry
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- UpdateEntry
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- FindEntry
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- DeleteEntry
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- KvPut
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- KvGet
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- KvDelete
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O(log(BUCKET_SIZE))
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- DeleteFolderChildren
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O(log(DIRECTORY_SIZE))
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- ListDirectoryEntries
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- ListDirectoryPrefixedEntries
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