[jira] [Created] (RATIS-2442) Fix flakiness for testChangeListenerToFollower

["Abhishek Pal (Jira)" <ji...@apache.org>]

Abhishek Pal created RATIS-2442:
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             Summary: Fix flakiness for testChangeListenerToFollower
                 Key: RATIS-2442
                 URL: https://issues.apache.org/jira/browse/RATIS-2442
             Project: Ratis
          Issue Type: Improvement
          Components: test
            Reporter: Abhishek Pal
            Assignee: Abhishek Pal


Sometimes 'testChangeListenerToFollower' checks for the listener role too early.

*setConfiguration()* returns once the reconfiguration is committed, but the listener node flips to follower later when the config entry is applied. 

The example scenario is as follows:
- client gets *setConfiguration()* success
- leader’s conf already shows no listeners
- the old listener may still be counted as a listener for a moment
- *cluster.getListeners()* can still return *1* due to this


The fix is to wait for the new configuration to settle before asserting on cluster.getListeners().

We can follow the other reconfiguration tests and use *RaftServerTestUtil.waitAndCheckNewConf()* to wait.



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