Slave status printed with INFO command

[Daniel Mezzatto]

I did a simple test: two redis instances at the same machine. One is slave and the other is master.

If I send the INFO command to the Master, I get the following:

slave0:127.0.0.1,37479,online

Then, I froze the slave process (with "kill -STOP <pid>") and waited a LONG time, like 15 minutes.

The INFO command on the Master redis-server was still showing "online".

I have noticed that there is no way for me to know if the master redis-server thinks that the slave redis-server is up or down, since the INFO string fills the status lik this:

switch(slave->replstate) {

                case REDIS_REPL_WAIT_BGSAVE_START:

                case REDIS_REPL_WAIT_BGSAVE_END:

                    state = "wait_bgsave";

                    break;

                case REDIS_REPL_SEND_BULK:

                    state = "send_bulk";

                    break;

                case REDIS_REPL_ONLINE:

                    state = "online";

                    break;

                }

Am I missing something? Is there a way to know if the Master detected that the Slave is down other then the INFO output?

[alex]

Because after you KILL the slave instance, there was no sysn operation between Master and Slave instance.

if you do some update/set operation on master,  this will trigger an exception when writing the replication info to slave on master. and the client wil be remove from the server's client list.

在 2012年5月19日星期六UTC+8上午5时31分56秒，Daniel Mezzatto写道：