func (self *ServerGroup) RemoveServer(zkConn zkhelper.Conn, addr string) error {
zkPath := fmt.Sprintf("/zk/codis/db_%s/servers/group_%d/%s", self.ProductName, self.Id, addr)
data, _, err := zkConn.Get(zkPath)
if err != nil {
return errors.Trace(err)
}
var s Server
err = json.Unmarshal(data, &s)
if err != nil {
return errors.Trace(err)
}
log.Info(s)
if s.Type == SERVER_TYPE_MASTER {
return errors.Errorf("cannot remove master, use promote first")
}
err = zkConn.Delete(zkPath, -1)
if err != nil {
return errors.Trace(err)
}
// update server list
for i := 0; i < len(self.Servers); i++ {
if self.Servers[i].Addr == s.Addr {
self.Servers = append(self.Servers[:i], self.Servers[i+1:]...)
break
}
}
// remove slave won't need proxy confirm
err = NewAction(zkConn, self.ProductName, ACTION_TYPE_SERVER_GROUP_CHANGED, self, "", false)
return errors.Trace(err)
}
func ForceRemoveLock(zkConn zkhelper.Conn, productName string) error {
lockPath := fmt.Sprintf("/zk/codis/db_%s/LOCK", productName)
children, _, err := zkConn.Children(lockPath)
if err != nil && !zkhelper.ZkErrorEqual(err, zk.ErrNoNode) {
return errors.Trace(err)
}
for _, c := range children {
fullPath := path.Join(lockPath, c)
log.Info("deleting..", fullPath)
err := zkConn.Delete(fullPath, 0)
if err != nil {
return errors.Trace(err)
}
}
return nil
}
func NewActionWithTimeout(zkConn zkhelper.Conn, productName string, actionType ActionType, target interface{}, desc string, needConfirm bool, timeoutInMs int) error {
ts := strconv.FormatInt(time.Now().Unix(), 10)
action := &Action{
Type: actionType,
Desc: desc,
Target: target,
Ts: ts,
}
// set action receivers
proxies, err := ProxyList(zkConn, productName, func(p *ProxyInfo) bool {
return p.State == PROXY_STATE_ONLINE
})
if err != nil {
return errors.Trace(err)
}
if needConfirm {
// do fencing here, make sure 'offline' proxies are really offline
// now we only check whether the proxy lists are match
fenceProxies, err := GetFenceProxyMap(zkConn, productName)
if err != nil {
return errors.Trace(err)
}
for _, proxy := range proxies {
delete(fenceProxies, proxy.Addr)
}
if len(fenceProxies) > 0 {
errMsg := bytes.NewBufferString("Some proxies may not stop cleanly:")
for k, _ := range fenceProxies {
errMsg.WriteString(" ")
errMsg.WriteString(k)
}
return errors.Errorf("%s", errMsg)
}
}
for _, p := range proxies {
buf, err := json.Marshal(p)
if err != nil {
return errors.Trace(err)
}
action.Receivers = append(action.Receivers, string(buf))
}
b, _ := json.Marshal(action)
prefix := GetWatchActionPath(productName)
//action root path
err = CreateActionRootPath(zkConn, prefix)
if err != nil {
return errors.Trace(err)
}
//response path
respPath := path.Join(path.Dir(prefix), "ActionResponse")
err = CreateActionRootPath(zkConn, respPath)
if err != nil {
return errors.Trace(err)
}
//create response node, etcd do not support create in order directory
//get path first
actionRespPath, err := zkConn.Create(respPath+"/", b, int32(zk.FlagSequence), zkhelper.DefaultFileACLs())
if err != nil {
log.ErrorErrorf(err, "zk create resp node = %s", respPath)
return errors.Trace(err)
}
//remove file then create directory
zkConn.Delete(actionRespPath, -1)
actionRespPath, err = zkConn.Create(actionRespPath, b, 0, zkhelper.DefaultDirACLs())
if err != nil {
log.ErrorErrorf(err, "zk create resp node = %s", respPath)
return errors.Trace(err)
}
suffix := path.Base(actionRespPath)
// create action node
actionPath := path.Join(prefix, suffix)
_, err = zkConn.Create(actionPath, b, 0, zkhelper.DefaultFileACLs())
if err != nil {
log.ErrorErrorf(err, "zk create action path = %s", actionPath)
return errors.Trace(err)
}
if needConfirm {
if err := WaitForReceiverWithTimeout(zkConn, productName, actionRespPath, proxies, timeoutInMs); err != nil {
return errors.Trace(err)
}
}
return nil
}
