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Merge pull request #2637 from bakins/proxy-randomize-endpoints

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proxy: shuffle endpoints
This commit is contained in:
Xiang Li 2015-04-07 14:12:50 -07:00
commit 1b4bcedf99
2 changed files with 10 additions and 0 deletions
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2
Documentation/proxy.md
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@ -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. 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 ### 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`). To start etcd in proxy mode, you need to provide three flags: `proxy`, `listen-client-urls`, and `initial-cluster` (or `discovery`).

8
proxy/director.go
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@ -16,6 +16,7 @@ package proxy
import ( import (
"log" "log"
"math/rand"
"net/url" "net/url"
"sync" "sync"
"time" "time"
@ -65,6 +66,13 @@ func (d *director) refresh() {
} }
endpoints = append(endpoints, newEndpoint(*uu)) 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 d.ep = endpoints
} }