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etcdmain: add --experimental-serializable-ordering to grpc proxy

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Connect to another endpoint on stale reads.
This commit is contained in:
Anthony Romano 2017-07-26 17:10:10 -07:00
parent fca56f132a
commit f6acd0316c
1 changed files with 21 additions and 1 deletions
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22
etcdmain/grpc_proxy.go
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@ -15,6 +15,7 @@
package etcdmain
import (
"context"
"fmt"
"math"
"net"
@ -26,6 +27,7 @@ import (
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/clientv3/namespace"
"github.com/coreos/etcd/clientv3/ordering"
"github.com/coreos/etcd/etcdserver/api/etcdhttp"
"github.com/coreos/etcd/etcdserver/api/v3election/v3electionpb"
"github.com/coreos/etcd/etcdserver/api/v3lock/v3lockpb"
@ -69,7 +71,8 @@ var (
grpcProxyNamespace string
grpcProxyEnablePprof bool
grpcProxyEnablePprof bool
grpcProxyEnableOrdering bool
)
func init() {
@ -119,6 +122,9 @@ func newGRPCProxyStartCommand() *cobra.Command {
cmd.Flags().BoolVar(&grpcProxyListenAutoTLS, "auto-tls", false, "proxy TLS using generated certificates")
cmd.Flags().StringVar(&grpcProxyListenCRL, "client-crl-file", "", "proxy client certificate revocation list file.")
// experimental flags
cmd.Flags().BoolVar(&grpcProxyEnableOrdering, "experimental-serializable-ordering", false, "Ensure serializable reads have monotonically increasing store revisions across endpoints.")
return &cmd
}
@ -255,6 +261,20 @@ func mustListenCMux(tlsinfo *transport.TLSInfo) cmux.CMux {
}
func newGRPCProxyServer(client *clientv3.Client) *grpc.Server {
if grpcProxyEnableOrdering {
vf := ordering.NewOrderViolationSwitchEndpointClosure(*client)
client.KV = ordering.NewKV(client.KV, vf)
plog.Infof("waiting for linearized read from cluster to recover ordering")
for {
_, err := client.KV.Get(context.TODO(), "_", clientv3.WithKeysOnly())
if err == nil {
break
}
plog.Warningf("ordering recovery failed, retrying in 1s (%v)", err)
time.Sleep(time.Second)
}
}
if len(grpcProxyNamespace) > 0 {
client.KV = namespace.NewKV(client.KV, grpcProxyNamespace)
client.Watcher = namespace.NewWatcher(client.Watcher, grpcProxyNamespace)