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tarantool-etcd-f7d Maintenance.Downgrade not routed — and docs/TODO.md's unimplemented-RPC list omits it Lined Up

status: open P3 bug etcd-changelog-sweep
bd update tarantool-etcd-f7d --claim bd close tarantool-etcd-f7d
Created byEugene Blikh
Ownerbigbes@gmail.com
Created2026-07-17T13:21:58Z
Updated2026-07-17T13:21:58Z
Description
Proto and generated schema are present (app/etcd/pb/gen/etcdserverpb/rpc_pb.lua:900-927) but Downgrade is ABSENT from app/etcd/pb/routes.lua:86-93 — gRPC returns UNIMPLEMENTED, JSON 404s.

Secondary doc bug: docs/TODO.md:182-196 presents an 'only unimplemented RPCs' list that omits Downgrade, so the doc understates the gap. The test adapter already notes it (tests/conformance/jsonclient/maintenance.go:127-132).

Downgrade is meaningful for a Tarantool backend only in a limited sense (no bbolt version to step down), so routing it as an explicit, well-shaped UNIMPLEMENTED may be the right end state — but that should be a decision, not an omission.
Acceptance criteria
Downgrade routed (even if it returns a deliberate UNIMPLEMENTED with the etcd error shape); docs/TODO.md unimplemented list corrected to include it.

Depends on

No outgoing dependencies.

Depended on by

Nothing depends on this issue.

No comments.

  • Eugene Blikh created the issue · 2026-07-17T16:21:58Z
  • Eugene Blikh added label etcd-changelog-sweep · 2026-07-17T16:21:58Z
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issues 1 row
id tarantool-etcd-f7d
content_hash 0b11602233e7ca9e473e7eb7f7f1a3c7ca580f04e819dc43ad32a364daf12f08
title Maintenance.Downgrade not routed — and docs/TODO.md's unimplemented-RPC list omits it
description Proto and generated schema are present (app/etcd/pb/gen/etcdserverpb/rpc_pb.lua:900-927) but Downgrade is ABSENT from app/etcd/pb/routes.lua:86-93 — gRPC returns UNIMPLEMENTED, JSON 404s. Secondary doc bug: docs/TODO.md:182-196 presents an 'only unimplemented RPCs' list that omits Downgrade, so the doc understates the gap. The test adapter already notes it (tests/conformance/jsonclient/maintenance.go:127-132). Downgrade is meaningful for a Tarantool backend only in a limited sense (no bbolt version to step down), so routing it as an explicit, well-shaped UNIMPLEMENTED may be the right end state — but that should be a decision, not an omission.
design
acceptance_criteria Downgrade routed (even if it returns a deliberate UNIMPLEMENTED with the etcd error shape); docs/TODO.md unimplemented list corrected to include it.
notes
status open
priority 3
issue_type bug
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created_at 2026-07-17T13:21:58Z
created_by Eugene Blikh
owner bigbes@gmail.com
updated_at 2026-07-17T13:21:58Z
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created_at 2026-07-17T16:21:58Z