4.1, by @Ayanda-D: stop QQ replicas when a QQ is forced to shrink to a single replica #12468
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michaelklishin merged 5 commits intomainfrom Oct 8, 2024
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4.1, by @Ayanda-D: stop QQ replicas when a QQ is forced to shrink to a single replica #12468michaelklishin merged 5 commits intomainfrom
michaelklishin merged 5 commits intomainfrom
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@Ayanda-D the failure on Erlang 27 in |
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The failures seem to be unrelated to the changes here. See erlang/otp#8908 and erlang/otp#8911. |
✅ Backports have been createdDetails
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@michaelklishin Thank you! 🙏 |
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FTR, this was backported to
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(cherry picked from commit 6b8fcd6)
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This is #12427 by @Ayanda-D.
Shrinking operations did not stop QQ replicas. This was easy to miss because QQs are usually shrunk before a node is removed from the cluster.
However, there is a scenario where this is not the case. If some nodes (replicas) need to be replaced, in particular when a majority of nodes cannot be recovered for any reasons, the recovery process will involve shrinking a QQ to just one member so that it has an online quorum (of 1 node out of 1) before new replicas can be added.
For this to succeed, the older replicas must be stopped and deleted from the (QQ) cluster.