REP-5318 Retry on change stream failures. #52
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Previously this function actually returned the most recent cluster time rather than creating a new cluster time. This changeset makes it now create a new time instead. This simplifies the change stream’s handling of the writesOff timestamp because the writesOff timestamp is separate from any change event.
This entails a small refactor of the change stream code so that the change stream’s creation and iteration both happen under a retryer.
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REVIEW NOTE
It probably makes sense to review this PR’s 2 commits separately.
This is necessary for testing migration-verifier’s change stream in mongosync’s nondeterministic tests. It entails a small refactor of the change stream code so that both the change stream’s creation and iteration happen under a retryer.
Additionally, this makes GetNewClusterTime() return an actual new cluster time rather than returning the current one. This simplifies reasoning about the change stream’s handling of the writesOff timestamp.