mridulm opened a new pull request, #38378:
URL: https://github.com/apache/spark/pull/38378
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### What changes were proposed in this pull request?
##### Quick submission of drivers in tests to mesos scheduler results in
dropping drivers
Queued drivers in `MesosClusterScheduler` are ordered based on
`MesosDriverDescription` - and the ordering used checks for priority (if
different), followed by comparison of submission time.
For two driver submissions with same priority, if made in quick succession
(such that submission time is same due to millisecond granularity of Date),
this results in dropping the second `MesosDriverDescription` from
`queuedDrivers` (since `driverOrdering` returns `0` when comparing the
descriptions).
This PR fixes the more immediate issue with tests.
### Why are the changes needed?
Flakey tests, [see
here](https://lists.apache.org/thread/jof098qxp0s6qqmt9qwv52f9665b1pjg) for an
example.
### Does this PR introduce _any_ user-facing change?
No.
Fixing only tests for now - as mesos support is deprecated, not changing
scheduler itself to address this.
### How was this patch tested?
Fixes unit tests
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