The default roundTripTime of a ServerDescription is -1, which means if that value is used we can potentially calculate a negative roundTripTime. Instead, if no previous roundTripTime exists, we use the duration of the initial handshake.
A number of new options were added when the CMAP compliant connection pool was introduced in 3.5.x. Unfortunately, these options were not documented properly. Now they are mentioned in the MongoClient documentation, with a notice that they are only supported with the unified topology.
A fix in 3.5.8 which ensured proper filtering of servers during server selection exposed an issue in max staleness calculations when the topology type is ReplicaSetNoPrimary and no servers are currently known. In order to estimate an upper bound of max staleness when there is no primary, the most stale known server is known to compare the others to - if there are no known servers, you can't reduce the array!
In certain very high load fail-over scenarios the driver is unable to reschedule a monitoring check in order to update its view of the topology for retryability. This would result in a high number of failed operations, as they were unable to determine a new viable server.
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Bumps mongodb from 3.3.3 to 3.5.9.
Release notes
Sourced from mongodb's releases.
Commits
99681e1
chore(release): 3.5.9c743217
test: two uncaught change stream test methods which leak sessionsddfa41b
fix: use duration of handshake if no previous roundTripTime exists76249cb
refactor: use common methods for duration calculations6f3048c
doc: document options supported by the new CMAP connection pool1f855a4
fix: use async interruptable interval for server monitoring9e12cd5
feat: introduce an interruptable async interval timer7baa85e
test: fix a number of our most notorious flakey tests62d80e4
test: move wtfnode invocation to signal handlers on main test runnerbe51347
fix: don't try to calculate sMax if there are no viable serversDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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