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