[GitHub] [pulsar] eolivelli commented on issue #12556: Permanent namespace corruption after attempting to delete a namespace shortly after it was created and after all contained topics were deleted; broker log of "MetadataNotFoundException: Managed ledger not found"

[GitBox <gi...@apache.org>]

eolivelli commented on issue #12556:
URL: https://github.com/apache/pulsar/issues/12556#issuecomment-1053314167


   In a system that is not under heavy load on metadata the local caches should be updated in a timely manner.
   If the system does not converge to a consistent view over metadata then we have some bugs.
   We recently found a problem on the usage of Caffeine in the local metadata cache.
   
   The alternative is to switch to a distributed local cache that guarantees causal consistency for the near caches, that is, when I write to the cache and the write returns I am sure that every local copy in each near cache is invalidated (or updated).
   
   Some years ago I worked on this project to solve this problem https://github.com/diennea/blazingcache
   It implements a very lightweight cache with near caching support and strong guarantees about causal consistency. Because we really needed to have such guarantees of distributed cache invalidation.


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