Łukasz Paszkowski 67f1c6d36c topology_coordinator: Add barrier to cleanup_target ...

Consider the following scenario:
1. A table has RF=3 and writes use CL=QUORUM
2. One node is down
3. There is a pending tablet migration from the unavailable node
   that is reverted

During the revert, there can be a time window where the pending replica
being cleaned up still accepts writes. This leads to write failures,
as only two nodes (out of four) are able to acknowledge writes.

This patch fixes the issue by adding a barrier to the cleanup_target
tablet transition state, ensuring that the coordinator switches back to
the previous replica set before cleanup is triggered.

Fixes https://github.com/scylladb/scylladb/issues/26512

2025-12-03 16:19:17 +01:00

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