ceph/src/rocksdb/utilities/redis/README

   1 This folder defines a REDIS-style interface for Rocksdb.
   2 Right now it is written as a simple tag-on in the rocksdb::RedisLists class.
   3 It implements Redis Lists, and supports only the "non-blocking operations".
   4
   5 Internally, the set of lists are stored in a rocksdb database, mapping keys to
   6 values. Each "value" is the list itself, storing a sequence of "elements".
   7 Each element is stored as a 32-bit-integer, followed by a sequence of bytes.
   8 The 32-bit-integer represents the length of the element (that is, the number
   9 of bytes that follow). And then that many bytes follow.
  10
  11
  12 NOTE: This README file may be old. See the actual redis_lists.cc file for
  13 definitive details on the implementation. There should be a header at the top
  14 of that file, explaining a bit of the implementation details.