seaweedfs/note/weedfs.txt
2013-02-10 03:09:26 -08:00

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How to submit a content
1. Find physical volumes
1.c Create a hash value
1.d find a write logic volume id, and return [logic volume id, {physical volume ids}]
2. submit to physical volumes
2.c
generate the cookie
generate a unique id as key
choose the right altKey
send bytes to physical volumes
2.s each
save bytes
store map[key uint64, altKey uint32]<offset, size>
for updated entry, set old entry's offset to zero
3.c
wait for all physical volumes to finish
store the /<logic volume id>/<key>_<cookie>_<altKey>.<ext>
How to retrieve a content
1.c
send logic volume id
1.d
find least busy volume's id
2.c
send URI /<physical volume id>/<key>_<cookie>_<altKey>.<ext>
How to submit a content
1. send bytes to weedfs, got <volume id, key uint64, cookie code>
store <key uint64, volume id uint32, cookie code uint32, ext>, and other information
To read a content
2. use logic volume id to lookup a <machine id>
render url as /<machine id>/<volume id>/<key>/<cookie>.ext
The directory server
0.init
load and collect <logic volume id, machine ids> mapping
1.on submit content
find a free logic volume id, start sending content to 3 machines
if all of them finishes, return <logic volume id, key, cookie code>
2.on read content
based on logic volume id, pick a machine with less load,
return <machine id>