xDS: add clarification about new requests superseding old ones (#372)

This change came from a conversation in the #control-plane-dev Slack channel. Details at: https://envoyproxy.slack.com/archives/C7LDJTM6Z/p1514113660000041 Signed-off-by: ljmatkins <ljmatkins@gmail.com>
8 years ago · bbd2cda0f0
parent c3bfbc75d9
commit bbd2cda0f0
1 changed files with 4 additions and 0 deletions
--- a/XDS_PROTOCOL.md
+++ b/XDS_PROTOCOL.md
@ -123,6 +123,10 @@ server provides the same set of resources rather than waiting for a change to
 occur, it will cause Envoy and the management server to spin and have a severe
 performance impact.

+Within a stream, new `DiscoveryRequest`s supersede any prior `DiscoveryRequest`s 
+having the same resource type. This means that the management server only needs 
+to respond to the latest `DiscoveryRequest` on each stream for any given resource
+type. 

 #### Resource hints