what must be clear while upgrading application/dependencies?


  • new version is compatiable with old version
  • old version is NOT compatiable with new version


  • rollout(old -> new) or rollback(new -> old)
    • case#1 new produce -> new consume OK
    • case#2 new produce -> old consume ERROR
    • case#3 old produce -> new consume OK
    • case#4 old produce -> old consume OK


  1. if retry could make case#2 work, then it’s ok and expected, otherwise we need to figure out how to do the upgrade carefully
  2. if cache object deserilization is included, better consider using a fresh new cache key(sth like version number) to make sure new version won’t load the outdated version of cache data