Virtual Cache

Virtual cache represent the cache nodes detected by server agents' plugins. The performance metrics of the cache are also from the Cache client-side perspective.

For example, Redis plugins in the Java agent could detect the latency of command As a result, SkyWalking would show traffic, latency, success rate, and sampled slow operations(write/read) powered by backend analysis capabilities in this dashboard.

The cache operation span should have

  • It is an Exit or Local span
  • Span’s layer == CACHE
  • Tag key = cache.type, value = The type of cache system , e.g. redis
  • Tag key = cache.op, value = the operation of command , indicates the command is used for write or read operation
  • Tag key = cache.command, value = the cache command , e.g. get,set,del
  • Tag key = cache.key, value = the cache key
  • If the cache system is in-memory (e.g. Guava-cache), agents' plugin would create a local span usually, and the span’s peer would be null ,otherwise the peer is the network address(IP or domain) of Cache server.