fix(NODE-7411): iterate all servers on close#4967
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The method had a premature 'return' inside the for loop, which caused it to only close connections on the first server and exit immediately. This fix removes the return statement so all servers have their checked-out connections closed when MongoClient.close() is called. This bug would affect multi-server topologies (replica sets, sharded clusters) where only the first server's connections would be properly closed.
…deployments - Remove 'single' topology restriction from metadata to support replicaset/sharded - Use readPreference: 'secondaryPreferred' to exercise connections to secondaries - Switch from insert to find operations to validate reads against secondaries
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Description
Summary of Changes
Supplants:
Additional Coverage:
Adds additional coverage for resource clearing to the mongo client tests, ensuring that cursors and sessions are properly wiped after closure, regardless of connection state. Also closes a missing test gap which ensures duplicate/misordered calls of connect()/close() dont cause fatal behaviour (increasing coverage slightly).
Adjusts client closure SDAM tests to ensure event ordering is maintained when a closure spans 2 connection pools.
Notes for Reviewers
Connpool tests validate SDAM requirements at the connpool level, whereas the clientclose tests ensure that those requirements persist when a coordinator attempts to close all connections across mutliple connpools. The domain of this 'coordination testing' is explicitly owned by the client close tests and the extension of the duplicate behaviour in connection_pool.test.ts is where domain-affinity to the mongo client is solidified.
What is the motivation for this change?
Release Highlight
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Double check the following
npm run check:lint)type(NODE-xxxx)[!]: descriptionfeat(NODE-1234)!: rewriting everything in coffeescript