The MongoDB oplog displays repetitive patterns at unpredictable intervals

My current focus is on utilizing MongoDB and the oplog has proven to be a crucial component of my application. However, I've noticed a recurring issue during development where the oplog contains duplicate records (changes) 3 or 4 times.

In an attempt to troubleshoot this issue, I have diligently used console logging to track every step of the database update process and monitor the oplog. Despite these efforts, I find myself at a loss.

oplogPO.on('update', function (data) { console.log(data.o) }

The code snippet above consistently displays { '$set': { status: 1000 } }, but sometimes it outputs this information multiple times.

Has anyone else encountered this issue before? Could someone provide insight into why this duplication occurs?

Furthermore, this marks my first time reaching out for assistance on stackoverflow, so please feel free to offer any feedback if I missed any guidelines ;)

javascriptmongodb

Answer №1

Issue Resolved!

I have made a modification to streamline the process of utilizing changes in the oplog with sockets. Now, the entire oplog is integrated into the connection:

io.on('connection', function(socket){
 oplogPO.on('update', function (data) { console.log(data.o) }
 socket.emit('updateOrders', {data: "send the socket"});
})

This adjustment ensures that every time a connection is established, the amount of repetition is increased.

Updated Code:

var socketStuff
oplogPO.on('update', function (data) { 
 socketStuff.emit('updateOrders', {data: "send the socket"});
}

io.on('connection', function(socket){
 socketStuff = socket
 socket.emit('updateOrders', {data: "send the socket"});
})

While it may not be the most elegant solution, it gets the job done :)

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