Question

jedis src代码MasterListener方法运行：

     j.subscribe(new JedisPubSub() {
        @Override
        public void onMessage(String channel, String message) {
          log.fine("Sentinel " + host + ":" + port + " published: " + message + ".");

          String[] switchMasterMsg = message.split(" ");

          if (switchMasterMsg.length > 3) {

            if (masterName.equals(switchMasterMsg[0])) {
              initPool(toHostAndPort(Arrays.asList(switchMasterMsg[3], switchMasterMsg[4])));
            } else {
              log.fine("Ignoring message on +switch-master for master name "
                  + switchMasterMsg[0] + ", our master name is " + masterName);
            }

          } else {
            log.severe("Invalid message received on Sentinel " + host + ":" + port
                + " on channel +switch-master: " + message);
          }
        }
      }, "+switch-master");

如果有三个Sentinels，那么创建三个MasterListener。当发生故障转移时，jedis客户端将为每个MasterListener三次initPool。

问题是：为什么不只是initPool一次？当sentinel目标离线高手时，那么jedis客户端接收到重新initPool的消息？

Answer 1

我认为此行需要同步＆＃34; if（！master.equals（currentHostMaster））{＆＃34;防止多次创建连接池。

    public class JedisSentinelPool extends JedisPoolAbstract {
    private volatile HostAndPort currentHostMaster;
    private void initPool(HostAndPort master) {
    if (!master.equals(currentHostMaster)) {
      currentHostMaster = master;
      if (factory == null) {

}

jedis MasterListener initPool很多次

1 个答案: