How to enable ReadConcernMajority in MongoDB 3.6.3

问题:

I'm running a MongoDB 3.6.3 with pymongo. I would like to use watch on a collection but it returns the following error: ReadConcernMajorityNotEnabled. Can anyone tell me how to enable it please?

thanks

回答1:

Read concern majority should be enabled by default in MongoDB 3.6 but there are several requirements to note if you have upgraded from a prior major MongoDB release or changed default configuration values.

Server configuration settings to check:

• Your deployment is using the WiredTiger storage engine

  db.serverStatus().storageEngine should include "name": "wiredTiger"

  If you need to change this, see: Change Replica Set to WiredTiger.

• Replication is enabled with protocol version 1 (pv1)

  rs.conf().protocolVersion should be NumberLong("1")

  If you need to change this, see: Modify Replica Set Protocol Version.

• 3.6 feature compatibility is enabled

  db.adminCommand({getParameter: 1, featureCompatibilityVersion: 1}) should include "version": "3.6"

  If you need to change this, see: Enable backwards-incompatible 3.6 features.