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clientv3/balancer: mark partitioned member as unhealthy

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Previous behavior is when server returns errors, retry
wrapper does not do anything, while passively expecting
balancer to gray-list the isolated endpoint. This is
problematic when multiple endpoints are passed, and
network partition happens.

This patch adds 'endpointError' method to 'balancer' interface
to actively(possibly even before health-check API gets called)
handle RPC errors and gray-list endpoints for the time being,
thus speeding up the endpoint switch.

This is safe in a single-endpoint case, because balancer will
retry no matter what in such case.

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>
This commit is contained in:
Gyu-Ho Lee 2017-10-07 06:22:56 -07:00
parent 1704443c6d
commit fbed568b6a
3 changed files with 15 additions and 0 deletions
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4
clientv3/balancer.go
View File

@ -44,6 +44,8 @@ type balancer interface {
endpoints() []string
// pinned returns the current pinned endpoint.
pinned() string
// endpointError handles error from server-side.
endpointError(addr string, err error)
// up is Up but includes whether the balancer will use the connection.
up(addr grpc.Address) (func(error), bool)
@ -150,6 +152,8 @@ func (b *simpleBalancer) pinned() string {
return b.pinAddr
}
func (b *simpleBalancer) endpointError(addr string, err error) { return }
func getHost2ep(eps []string) map[string]string {
hm := make(map[string]string, len(eps))
for i := range eps {

9
clientv3/health_balancer.go
View File

@ -177,6 +177,15 @@ func (hb *healthBalancer) liveAddrs() []grpc.Address {
return addrs
}
func (hb *healthBalancer) endpointError(addr string, err error) {
hb.mu.Lock()
hb.unhealthy[addr] = time.Now()
hb.mu.Unlock()
if logger.V(4) {
logger.Infof("clientv3/health-balancer: marking %s as unhealthy (%v)", addr, err)
}
}
func (hb *healthBalancer) mayPin(addr grpc.Address) bool {
hb.mu.RLock()
skip := len(hb.addrs) == 1 || len(hb.unhealthy) == 0

2
clientv3/retry.go
View File

@ -66,6 +66,8 @@ func (c *Client) newRetryWrapper(isStop retryStopErrFunc) retryRpcFunc {
if logger.V(4) {
logger.Infof("clientv3/retry: error %v on pinned endpoint %s", err, pinned)
}
// mark this before endpoint switch is triggered
c.balancer.endpointError(pinned, err)
notify := c.balancer.ConnectNotify()
if s, ok := status.FromError(err); ok && s.Code() == codes.Unavailable {
c.balancer.next()