ceph/src/seastar/doc/rpc-compression.md

   1 # RPC provided compression infrastructure
   2
   3 ## Compression algorithm negotiation
   4
   5 RPC protocol only defines `COMPRESS` feature bit but does not define format of its data.
   6 If application supports multiple compression algorithms it may use the data for algorithm
   7 negotiation. RPC provides convenience class `multi_algo_compressor_factory` to do it
   8 so that each application will not have to re-implement the same logic. The class gets list
   9 of supported compression algorithms and send them as comma separated list in `COMPRESS` feature
  10 payload. On receiving of the list it matches common algorithm between client and server. In case
  11 there is more than one the order of algorithms in clisnt's list is considered to be a tie breaker.
  12
  13 ### COMPRESS feature data format when multi_algo_compressor_factory is used
  14
  15 Comma separated string of algorithms names
  16