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Upstream Changes Summary:
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DRIVERS-2816:
Summary of necessary driver changes

Modify the unified test runner to collect the cluster time from the internal MongoClient following initialData operations, and use it to advance cluster times of all session entities created during the subsequent test. See mongodb/specifications@fd6ae12 for implementation details.

Context for other referenced/linked tickets

~~SERVER-82353~~ addressed a correctness issue for sharded clusters, which requires gossipping the cluster time between mongos hsots (particularly the server used to create collections and other(s) used to execute transactions) in order to avoid a MigrationConflict error.
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DRIVERS-2816 : Summary of necessary driver changes Modify the unified test runner to collect the cluster time from the internal MongoClient following initialData operations, and use it to advance cluster times of all session entities created during the subsequent test. See mongodb/specifications@fd6ae12 for implementation details. Context for other referenced/linked tickets SERVER-82353 addressed a correctness issue for sharded clusters, which requires gossipping the cluster time between mongos hsots (particularly the server used to create collections and other(s) used to execute transactions) in order to avoid a MigrationConflict error.

Documentation Changes:
Not Needed
Documentation Changes Summary:

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1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

This ticket was split from DRIVERS-2816, please see that ticket for a detailed description.

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DRIVERS-2816 Gossip cluster time from internal MongoClient to session entities