cluster_minority_SUITE: Fix race in remove_node_when_seed_node_is_leader
#14150
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…ader`
[Why]
When node A becomes the leader, it still takes a few exchanges with
followers to allow cluster changes again.
Concurrently, the testcase blocks traffic between A and other nodes to
simulate a network partition. If this happens after A becomes the leader
but before cluster changes are permitted again, the testcase will never
succeed and will eventually abort with:
Case: cluster_minority_SUITE:remove_node_when_seed_node_is_leader
Reason: {error,
{{awaitMatch,
[{module,cluster_minority_SUITE},
{expression, "..."},
{pattern,"ok"},
{value,
{error,69,<<"Error:\ncluster_change_not_permitted">>}}]},
[How]
Before blocking traffic, we wait for cluster changes to be permitted
again on node A.
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Why
When node A becomes the leader, it still takes a few exchanges with followers to allow cluster changes again.
Concurrently, the testcase blocks traffic between A and other nodes to simulate a network partition. If this happens after A becomes the leader but before cluster changes are permitted again, the testcase will never succeed and will eventually abort with:
How
Before blocking traffic, we wait for cluster changes to be permitted again on node A.