Commits on Aug 15, 2024

1. Add new 'quorum' blob access …

   Add a new 'quorum' blob access, that provides high availability on top of
   already-durable storage.
   
   Quorum blob access only requires that a subset of backends are available in
   order to function successfully.  The exact quorum size is configurable, but
   almost all cases should use "half the number of backends, rounded up" for both
   read and write quorum size.  ie: 2 out of 3 backends for single-failure
   tolerance, or 3 out of 5 backends for double-failure tolerance.
   
   Writes (Put) must succeed on at least write_quorum number of backends, and occur
   in parallel.  Reads (Get) must see at least read_quorum number of not-found
   responses before concluding the blob does not exist, and occur sequentially.
   FindMissing reads are performed in parallel on read_quorum number of backends,
   and results are merged.
   
   Note: blobs are not replicated again after the initial Put, so the underlying
   storage should be durable.

   

   anguslees committed Aug 15, 2024
   Configuration menu

   • View commit details
   • Copy full SHA for 14be4e3
   • Browse repository at this point

   Copy the full SHA

   14be4e3 View commit details

   Browse the repository at this point in the history