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client: remote var leader which is the same as forwardedHost #7965

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client: remote var leader which is the same as forwardedHost #7965

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9 changes: 5 additions & 4 deletions client/tso_dispatcher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -727,7 +727,8 @@ func (c *tsoClient) getAllTSOStreamBuilders() map[string]tsoStreamBuilder {
// a TSO proxy to reduce the pressure of the main serving service endpoint.
func (c *tsoClient) tryConnectToTSOWithProxy(dispatcherCtx context.Context, dc string, connectionCtxs *sync.Map) error {
tsoStreamBuilders := c.getAllTSOStreamBuilders()
leaderAddr := c.svcDiscovery.GetServingURL()
// Note: the forwardedHost is the main serving service endpoint such as leader or primary.
// But now only the Global TSO supports the TSO Follower Proxy.
forwardedHost, ok := c.GetTSOAllocatorServingURLByDCLocation(dc)
if !ok {
return errors.Errorf("cannot find the allocator leader in %s", dc)
Expand All @@ -752,16 +753,16 @@ func (c *tsoClient) tryConnectToTSOWithProxy(dispatcherCtx context.Context, dc s
log.Info("[tso] try to create tso stream",
zap.String("dc", dc), zap.String("addr", addr))
cctx, cancel := context.WithCancel(dispatcherCtx)
// Do not proxy the leader client.
if addr != leaderAddr {
// Do not proxy the target forwared host client.
if addr != forwardedHost {
log.Info("[tso] use follower to forward tso stream to do the proxy",
zap.String("dc", dc), zap.String("addr", addr))
cctx = grpcutil.BuildForwardContext(cctx, forwardedHost)
}
// Create the TSO stream.
stream, err := tsoStreamBuilder.build(cctx, cancel, c.option.timeout)
if err == nil {
if addr != leaderAddr {
if addr != forwardedHost {
forwardedHostTrim := trimHTTPPrefix(forwardedHost)
addrTrim := trimHTTPPrefix(addr)
requestForwarded.WithLabelValues(forwardedHostTrim, addrTrim).Set(1)
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