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pool: discard stale replacement shard connections#864

Draft
dkropachev wants to merge 1 commit intodk/pool-stale-failures-858from
dk/pool-stale-replacement-shards-859
Draft

pool: discard stale replacement shard connections#864
dkropachev wants to merge 1 commit intodk/pool-stale-failures-858from
dk/pool-stale-replacement-shards-859

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Summary

  • fence replacement and missing-shard connection publication by the endpoint captured when replacement started
  • close replacement connections if endpoint ownership changes during keyspace setup
  • remove the stale pool instead of publishing a connection for the wrong endpoint

Notes

This is a focused draft split from the host-state/pool race work. The base branch carries prerequisite fencing changes so this PR diff stays scoped to this issue.

Fixes #859

Testing

Not run for this split branch.

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