====== RedisDB ======

Runs on objectrec01

The following databases are defined:


  * 0: dev
  * 1: prelive
  * 2: live

The databases are used as


  * a Query Cache (prevent recalculation of similarity results for identical queries)
  * storage for image labels (should migrate into the next “lilly” version)
  * session docs (information about user sessions) see below for more info
  * A/B config docs (information needed by frontends to perform A/B tests) see below for more info


===== session doc =====

redis key pattern: “feedid#sessionid”

contents: msgpack python dictionary

<code>
  {
    "abtest":
    {
      "testid1": "A",
      "testid2": "B",
      ...
    },
    ...
  }
</code>

===== A/B config docs =====

redis key pattern: “abtest#feedid#testid”

contents: float (stored as string) indicating the probability of choosing “A”

**Remark**: This document should only exist while the test is active