func newCoordinator(clusterName string, c *Config) *Coordinator {
return &Coordinator{
clusterName: clusterName,
state: NewState,
config: c,
watchers: make(map[string]chan byte),
partitions: make(map[int]string),
workers: donut.NewSafeMap(nil),
rpcClients: make(map[string]*rpc.Client),
}
}
func (c *Coordinator) createBarrier(name string, onChange func(*donut.SafeMap)) {
bPath := path.Join(c.barriersPath, name)
if _, ok := c.watchers[bPath]; !ok {
if _, err := c.zk.Create(bPath, "", 0, zookeeper.WorldACL(zookeeper.PERM_ALL)); err == nil {
log.Printf("Created barrier %s", bPath)
} else {
// XXX should check to make sure its a "node already exists error"
log.Printf("Failed to create barrier %s: %v", bPath, err)
}
kill, err := watchZKChildren(c.zk, bPath, donut.NewSafeMap(make(map[string]interface{})), onChange)
if err != nil {
log.Fatalln(err)
}
c.watchers[name] = kill
}
}