demery-pivotal opened a new pull request #7129:
URL: https://github.com/apache/geode/pull/7129
PROBLEMS
- In test JVMs, `AvailablePortHelper` initialized its next candidate
port by selecting a random port within the available port range. This
often caused the test JVM's first few candidates to overlap with the
first few candidates of a child VM.
- `AvailablePortHelper` updated its next candidate port in non-atomic
way, making it possible for multiple threads to receive the same port
number.
SOLUTION
Change `AvailablePortHelper` to:
- Initialize its next candidate port to `AVAILABLE_PORT_LOWER_BOUND`
instead of randomly selecting an initial candidate.
- Update its next candidate port atomically by calling
`AtomicInteger.getAndUpdate(...)`.
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