diff --git a/Documentation/proxy.md b/Documentation/proxy.md index ab9c8a1b5..7e2e8b4da 100644 --- a/Documentation/proxy.md +++ b/Documentation/proxy.md @@ -4,6 +4,8 @@ etcd can now run as a transparent proxy. Running etcd as a proxy allows for easi etcd currently supports two proxy modes: `readwrite` and `readonly`. The default mode is `readwrite`, which forwards both read and write requests to the etcd cluster. A `readonly` etcd proxy only forwards read requests to the etcd cluster, and returns `HTTP 501` to all write requests. +The proxy will shuffle the list of cluster members periodically to avoid sending all connections to a single member. + ### Using an etcd proxy To start etcd in proxy mode, you need to provide three flags: `proxy`, `listen-client-urls`, and `initial-cluster` (or `discovery`). diff --git a/proxy/director.go b/proxy/director.go index 862690d4d..e795b27fb 100644 --- a/proxy/director.go +++ b/proxy/director.go @@ -16,6 +16,7 @@ package proxy import ( "log" + "math/rand" "net/url" "sync" "time" @@ -65,6 +66,13 @@ func (d *director) refresh() { } endpoints = append(endpoints, newEndpoint(*uu)) } + + // shuffle array to avoid connections being "stuck" to a single endpoint + for i := range endpoints { + j := rand.Intn(i + 1) + endpoints[i], endpoints[j] = endpoints[j], endpoints[i] + } + d.ep = endpoints }