Replication & Sharding

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Ability to replicate the data within a cluster to another cluster

Two different scenarios. One scenario is to have a DR cluster. 2 independant clusters that are one way synced. As of right now, a custom CDC solution (custom code + Kafka) is needed to achieve this. Another is because of latency and the requirem...

Guest over 4 years ago in Replication & Sharding 0 Submitted

1 VOTE

Combine reshardCollection+mongosynd idea to support a remote collection on a separate new cluster

Great for prod productivity and 99.999 SLA if mongo could support this, for example, Given "mydb.mycoll" in current cluster being sharded with {zip:1} shard key 1/ New cluster: sh.shardCollection( "mydb.mycoll", {name:1, phone:1} ) 2/ "Mongocopy...

Guest over 2 years ago in Replication & Sharding 0 Submitted

1 VOTE

Support $documents on shards

The new aggregation operator $documents cannot be used together with $merge in a sharded cluster, you get an error: ``` db.aggregate([ { $documents: [ { _id: ObjectId("6616b08a610fab3e84d2d4ee"), a: 'foo', shardKey: 1 }, ] }, { $merge: { in...

Guest almost 3 years ago in Replication & Sharding 0 Submitted

1 VOTE

Raise an error when "majority" writes not possible

This topic is related to https://www.mongodb.com/docs/v6.0/tutorial/mitigate-psa-performance-issues/ in a PSA ReplicaSet configuration. When you try to execute a command with writeConcern `{w: "majority"}` in a three-member Primary-Secondary-Arbi...

Guest almost 3 years ago in Replication & Sharding 0 Submitted

1 VOTE

URL Decode `readPreferenceTags`

If a url encoded value is set to readPreferenceTags it will be ignored causing for instance connecting to analytics node impossible from tooling that correctly encodes the urls. It can look like this for instance: `readPreferenceTags=nodeType:ANA...

Guest over 3 years ago in Replication & Sharding 0 Submitted

1 VOTE

Shard Drain/ Removal issue

If we have more shards, and if want to remove few shards (more than 1), we use below command. db.adminCommand( { removeShard : "Shardname" } ) Ex, if I have Shard 1, 2, 3, 4, 5. want to remove Shard 2 & 5. I want to remove one shard at a ...

Guest about 4 years ago in Replication & Sharding 0 Submitted

1 VOTE

Mongo replicaset init sync issue

When we have large size mongo replica set, we may have to take out each nodes for maintenance for few hrs or days. In that case we have to increase size of Oplog to keep several days of transactions to resync nodes after maintanance. If the RS h...

Guest about 4 years ago in Replication & Sharding 0 Submitted

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