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Walk the DCs from nearest to most remote.

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This commit is contained in:
Sean Chittenden
2016-06-11 18:52:21 -04:00
parent 8d0b798f1d
commit 006d1a3290
1 changed files with 15 additions and 0 deletions
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15
client/client.go
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@@ -1291,6 +1291,21 @@ func (c *Client) setupConsulSyncer() error {
if err != nil {
return fmt.Errorf("client.consul: unable to query Consul datacenters: %v", err)
}
if len(dcs) > 2 {
// Query the local DC first, then shuffle the
// remaining DCs. Future heartbeats will cause Nomad
// Clients to fixate on their local datacenter so
// it's okay to talk with remote DCs. If the no
// Nomad servers are available within
// datacenterQueryLimit, the next heartbeat will pick
// a new set of servers so it's okay.
nearestDC := dcs[0]
otherDCs := make([]string, 0, len(dcs))
otherDCs = dcs[1:lib.MinInt(len(dcs), datacenterQueryLimit)]
shuffleStrings(otherDCs)
dcs = append([]string{nearestDC}, otherDCs...)
}
nomadServerServiceName := c.config.ConsulConfig.ServerServiceName
var mErr multierror.Error