Implementing 'Write follows Read' guarantee of causal consistency

[Unmesh_Joshi]

I see this discussion, which is related.

Does query advance Logical Time in MongoDB?

As I went through the MongoDB source code and the paper: Implementation of Cluster-wide Logical Clock and Causal Consistency in MongoDB. I have a question about the clock time: Does MongoDB advance the clock time when sending a query with ClusterTime field. For instance, in Change Streams, MongoS build several cursors to each MongoD, then it will send a getMore query to MongoD, so I want to know whether it’’ advance the HLC. As the above paper said: Cluster nodes (mongod, mongos, config serve…

I think my question in this post is related. And I think the no-op writes which happen as part of read requests, is critical to move the operationTime beyond the the time requested in read?