khepri_cluster: Stop spamming cluster with join/leave if it is not ready #295
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Why
If a cluster change (a member joining or leaving), it is not permitted to make another change: Ra will reply with the following error:
Before this patch, we would retry immediately after such an error. We were effeclively spamming the Ra server with many join/leave commands, but the user too with hundreds of "not ready; waiting..." log messages.
How
For now, we simply add a hard-coded 200 ms sleep before retrying.