Error: A slave with the same server_uuid/server_id as this slave has connected to the master;

[MInesGomes]

Hi @rodrigogs,

Has been working great!
But looking at the log error I saw a new one:

'A slave with the same server_uuid/server_id as this slave has connected to the master; the first event 'mysql-bin.000089' at 43535345, the last event read from '/mysql/binlog/mysql-bin.000089' at 56994447, the last byte read from '/mysql/binlog/mysql-bin.000089' at 56994447.',
sqlState: 'HY000' }

I have 2 databases (Production, Development )
And have 2 listeners that gives this error

My Code Dev

const mysql = require('mysql');
var MySQLEvents = require("@rodrigogs/mysql-events");
 const schemaName ='nms';

My Code Prod

const mysql = require('mysql');
var MySQLEvents = require("@rodrigogs/mysql-events");
 const schemaName ='nmsProd';

Same code for both

const db_config = { host: '35.234.131.94', user:XXX', password: XXX', database: schemaName, };

let connectDB = mysql.createConnection(db_config);
let instance = new MySQLEvents(connectDB, {
    startAtEnd: true,
    excludedSchemas: {
        mysql: true
    },
});
startTrigers();

function handleDisconnect() {
    console.log('handleDisconnect');
    connectDB.destroy();
    connectDB = mysql.createConnection(db_config);
    connectDB.connect(function (err) {
        if (err) {
            console.log(' Error when connecting to db  (DBERR001):', err);
            setTimeout(handleDisconnect, 1000);
        }
        else{
            // startTrigers();
        }
    });
}


instance.on(MySQLEvents.EVENTS.CONNECTION_ERROR, (err) => {
    console.log('Connection is asleep (time to wake it up): ', err);
    setTimeout(handleDisconnect, 1000);
    handleDisconnect();
});

instance.on(MySQLEvents.EVENTS.ZONGJI_ERROR, console.error);

function startTrigers() {

    instance.start();

    instance.addTrigger({
        name: 'ALERT_INSERTED',
        expression: schemaName + '.nms_alert',
        statement: MySQLEvents.STATEMENTS.INSERT,
        onEvent: (event) => {
            console.log("", new Date());
            console.log("==== ALERT INSERTED  ===");
            sendAlert(event);
        },
    });

Do I have to change something?

[rodrigogs]

This is probably a MySQL error related to the binlog state. I don't think it will stop the app from working properly tho.
Do you think you missed any event due to this?

[MInesGomes]

Yes, I think is working ok. I am restarting the app every day … So not sure ...

…

On 29 Aug 2019, at 19:44, Rodrigo Gomes da Silva ***@***.***> wrote: This is probably a MySQL error related to the binlog state. I don't think it will stop the app from working properly tho. Do you think you missed any event due to this? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#21?email_source=notifications&email_token=AAYZAHWMO3X63V6BYOBOGBLQHADI5A5CNFSM4ISBEJI2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5PIZ2Y#issuecomment-526290155>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAYZAHQZR2XFM7MU4R3O3CLQHADI5ANCNFSM4ISBEJIQ>.

[dalborgo]

Same problem for me.

[MInesGomes]

Yes. I need to start more than every day and found another way to do what I need it. So for the moment not using sqlevents

[dalborgo]

In my case, the error occurred when I restart the triggers (your "startTrigers" function). For a moment it creates a conflict with the precendet instance (or something of similar...). But the real problem is the disconnection from the server that, in my case, happens every 8 hours (my server is an amazonAWS one). If I force to restart the entire script, when an CONNECTION_ERROR occurred, I don't get the topic error. So I belive it's a instances problem. I recreate a new MySQLEvents instance too.

[rodrigogs]

Sorry for not being able to help. I'm deeply involved in some COVID-19 urgent projects and it's sucking my time to the bone.

[rmccownISoft]

Hopefully someone has a solution, otherwise this library is useless after the first time it disconnects. Looks like the control connection gets disconnected after the wait_timeout but the binlog connection remains. Try to pass it a new connection as above returns the "slave with same server_id" error.

[dalborgo]

You can try to force the instance to stop before restart the connection.

instance.stop()

This is my code and I don't get the topic error anymore.

const stopInstance = async () => {
    try {
      await instance.stop()
      return { ok: true, results: true }
    } catch (err) {
      return { ok: false, message: err.message, err }
    }
  }

  const manageError = origin => async err => {
    console.error(origin, err.message)
    try {
      console.log('Restarting due connection error!')
      const { ok, message } = await stopInstance()
      if (ok) {console.log('ZONGJI instance stopped!')} else {console.error(message)}
      connErrorCallback()
    } catch (err) {
      console.error('Restarting error', err.message)
      if (cFunctions.isProd()) {
        process.exit(1) //force to exit and restart with pm2
      }
    }
  }

  instance.on(MySQLEvents.EVENTS.CONNECTION_ERROR, manageError('CONNECTION_ERROR'))

[rmccownISoft]

Unfortunately, I've not managed to get instance.stop() to work in any iteration, I always end up with 'UnhandledPromiseRejectionWarning: Error: Cannot enqueue Quit after fatal error.'

[ubuntutest]

please don't flame me, i'm really new with nodejs, i don't know exactly what i'm doing.
But to solve this problem I assigned a random value, (more precisely the current date) so I know it will never have the same value.

  const instance = new MySQLEvents(connection, {
    startAtEnd: true,
    serverId: Date.now()
  });

is this totally wrong?

[imzers]

Hi, I have this error before, my environment was a master and some slave database, there is replication from slave-db to master-db and if I using mysql-events plugin to connect from another vm, it get error (A slave with the same server_uuid/server_id as this slave has connected....)
Found solustion by connect with another user with REPLICATION_SLAVE & REPLICATION_CLIENT privileges and unique server_id from concurrent connection
https://dba.stackexchange.com/questions/231414/error-a-slave-with-the-same-server-uuid-server-id-as-this-slave-has-connected