Services/Sync/Server/Notes/QuotaAlgo: Difference between revisions

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On a write
On a write
- If a user has no quota entry, grab the list from the database and put it into memcache along with the current timestamp
# If a user has no quota entry, grab the list from the database and put it into memcache along with the current timestamp
- get current total and associated timestamp
# get current total and associated timestamp
- if total > low_threshold and timestamp is older than 1h - refetch total from db and reset total and timestamp in memcache
# if total > low_threshold and timestamp is older than 1h - refetch total from db and reset total and timestamp in memcache
- if total > quota, reject write
# if total > quota, reject write
- write data
# write data
- add sum of incoming payloads to quota
# add sum of incoming payloads to quota
- if total > low_threshold, add an X-Weave header
# if total > low_threshold, add an X-Weave header
   
   
On a delete
On a delete
- delete data
# delete data
- delete user quota record from memcache
# delete user quota record from memcache


add /info/collection_usage (requires version bump to 1.1)
add /info/collection_usage (requires version bump to 1.1)
- get grouped collection totals
# get grouped collection totals
- write overall total to memcache
# sum them and write overall total (and timestamp) to memcache
   
   
monitoring script
monitoring script
- when user total is calculated, update memcache (may be firewall issues here)
# when user total is calculated, update memcache (may be firewall issues here)

Revision as of 22:12, 8 July 2010

Define low_threshold = quota - 1M

On a write

  1. If a user has no quota entry, grab the list from the database and put it into memcache along with the current timestamp
  2. get current total and associated timestamp
  3. if total > low_threshold and timestamp is older than 1h - refetch total from db and reset total and timestamp in memcache
  4. if total > quota, reject write
  5. write data
  6. add sum of incoming payloads to quota
  7. if total > low_threshold, add an X-Weave header

On a delete

  1. delete data
  2. delete user quota record from memcache

add /info/collection_usage (requires version bump to 1.1)

  1. get grouped collection totals
  2. sum them and write overall total (and timestamp) to memcache

monitoring script

  1. when user total is calculated, update memcache (may be firewall issues here)
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