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Why is a balancer important in MongoDB cluster?
Balancing is a very important aspect of any MongoDB sharded cluster. So, if you know about the balancing process in detail, it becomes very easy to modify the default behavior of the balancer process according to your needs and use cases. We were unable to load Disqus.
What happens If MongoDB migrates during a backup?
If MongoDB migrates a chunk during a backup, you can end with an inconsistent snapshot of your sharded cluster. Never run a backup while the balancer is active. To ensure that the balancer is inactive during your backup operation: Set the balancing window so that the balancer is inactive during the backup.
How to load balance mongod replica cluster in HAProxy?
I have created a mongod replica cluster of 2 nodes , mongo1 and mongo2. to load balance I have added following rule in my haproxy but if the mongo1 goes down mongo2 becomes the primary but even if mongo1 comes up mongo2 remains primary but ha redirect all traffic to mongo1 which is slave now.
What to do with MongoDB version 3.4?
From MongoDB version 3.4, you have to deploy config servers as a replica set. If you are enabling sharding in a production environment, then it is mandatory to use three separate config servers, each on different machines. You can follow this guide to convert your replica set cluster into a sharded cluster.
Can a Mongo driver sit behind a load balancer?
The driver keeps track of what is a primary and what is a secondary and routes queries appropriately. According to the Mongo docs: You may also deploy a group of mongos instances and use a proxy/load balancer between the application and the mongos.
How does vertical scaling affect MongoDB load balancing?
Vertical scaling of the MongoDB database typically includes increasing CPU capacity or disk capacity and increasing throughput (I/O operations). By adding more resources, your mongo server becomes more capable of handling multiple client’s requests. Thus, better load balancing for your database.
What does sharding do to a MongoDB server?
MongoDB provides horizontal scaling through sharding. MongoDB sharding gives additional capacity to distribute the write load across multiple servers (shards). Here, each shard can be seen as one independent database and the collection of all the shards can be viewed as one big logical database.