[release-v2.7] Fix querier panics #4901
Merged
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Backport 6d70705 from #4790
What this PR does:
A panic was introduced here by abusing the ring forEach function to collect results. replicationSet.Do can return before all reads are complete if quorum is reached. Under certain, rare circumstances this caused the forEach function to modify a result here after it has already been returned and was being marshalled by the gRPC stack into proto.
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]