[GitHub] [geode] demery-pivotal commented on pull request #7011: GEODE-9604: Use AvailablePortHelper in MSetDUnitTest

[GitBox <gi...@apache.org>]

demery-pivotal commented on pull request #7011:
URL: https://github.com/apache/geode/pull/7011#issuecomment-945937418


   Here's the cause:
   1. Start a member using port 0, which binds any available port from the ephemeral port range.
   2. Stop the member, which releases the port.
   3. Some other process on the machine binds to port 0, and the system randomly selects the port that the member just released.
   3. Start the member on its original port, which fails because another process has bound to it.
   
   It is risky to assume that a port allocated from the ephemeral port range remains free after it is released, as this test was doing. It is even more risky to make that assumption in CI, where dozens of other processes may be using the same port namespace.


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