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tarantool-etcd-ovo Learner: durable applied_index (WAL-equivalent for restart)
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| Created by | Eugene Blikh |
| Owner | bigbes@gmail.com |
| Created | 2026-05-20T06:45:17Z |
| Updated | 2026-07-17T14:27:37Z |
Persist enough raft state (currentTerm/HardState, applied_index, ConfState) so a restart resumes from the last applied entry instead of replaying from zero or forcing a full snapshot. Store in a dedicated space (e.g. etcd_raft_meta) written in the same transaction as each applied entry. On boot in learner mode: read last applied_index, reconnect transport, and request entries after it (or a snapshot if the leader has compacted past it). Tarantool's own WAL gives us durability of the *space writes*; this issue is specifically the raft bookkeeping that lets us re-attach to the cluster correctly.
etcd stores this as raft WAL + snapshot metadata; we collapse it to a meta space since Tarantool's WAL already durably persists the applied data.
tarantool-etcd-6js
— Learner: apply loop — InternalRaftRequest -> existing handlers
blocks
open
tarantool-etcd-cnj
— [epic] Raft-learner replica — join an etcd cluster as a non-voting member
parent-child
open
Nothing depends on this issue.
tarantool-etcd-6js
— Learner: apply loop — InternalRaftRequest -> existing handlers
blocks
open
tarantool-etcd-boq
— Learner: raft state machine (follower/learner subset)
blocks
open
tarantool-etcd-axs
— Learner: rafthttp peer transport over nghttp2
blocks
open
tarantool-etcd-umc
— Learner: config block + role plumbing
blocks
open
tarantool-etcd-cnj
— [epic] Raft-learner replica — join an etcd cluster as a non-voting member
parent-child
open
tarantool-etcd-7ey
— Replica route: connect as read-only replica to an existing etcd cluster
related
open
tarantool-etcd-16d
— Implement Maintenance.Snapshot RPC (streaming DB snapshot)
related
open
tarantool-etcd-4yb
— Learner: raftpb + InternalRaftRequest proto schemas
blocks
open
| id | tarantool-etcd-ovo |
| content_hash | b02eee9877621d78af7f66286e7ff63fc6564aac6beeca0cb795fe667217cb17 |
| title | Learner: durable applied_index (WAL-equivalent for restart) |
| description | Persist enough raft state (currentTerm/HardState, applied_index, ConfState) so a restart resumes from the last applied entry instead of replaying from zero or forcing a full snapshot. Store in a dedicated space (e.g. etcd_raft_meta) written in the same transaction as each applied entry. On boot in learner mode: read last applied_index, reconnect transport, and request entries after it (or a snapshot if the leader has compacted past it). Tarantool's own WAL gives us durability of the *space writes*; this issue is specifically the raft bookkeeping that lets us re-attach to the cluster correctly. |
| design | |
| acceptance_criteria | |
| notes | etcd stores this as raft WAL + snapshot metadata; we collapse it to a meta space since Tarantool's WAL already durably persists the applied data. |
| status | open |
| priority | 2 |
| issue_type | task |
| assignee | NULL |
| estimated_minutes | NULL |
| created_at | 2026-05-20T06:45:17Z |
| created_by | Eugene Blikh |
| owner | bigbes@gmail.com |
| updated_at | 2026-07-17T14:27:37Z |
| closed_at | NULL |
| closed_by_session | |
| external_ref | NULL |
| spec_id | |
| compaction_level | 0 |
| compacted_at | NULL |
| compacted_at_commit | NULL |
| original_size | NULL |
| sender | |
| ephemeral | 0 |
| wisp_type | |
| pinned | 0 |
| is_template | 0 |
| mol_type | |
| work_type | |
| source_system | |
| metadata | <binary> |
| source_repo | |
| close_reason | |
| event_kind | |
| actor | |
| target | |
| payload | |
| await_type | |
| await_id | |
| timeout_ns | 0 |
| waiters | |
| hook_bead | |
| role_bead | |
| agent_state | |
| last_activity | NULL |
| role_type | |
| rig | |
| due_at | NULL |
| defer_until | NULL |
| no_history | 0 |
| started_at | NULL |
| is_blocked | 1 |
| issue_id | tarantool-etcd-ovo |
| label | milestone:m5-clustering |
| id | 21eff322-baea-5777-96c0-aa1d9ecc0c8a |
| issue_id | tarantool-etcd-ovo |
| type | blocks |
| created_at | 2026-05-20T09:47:29Z |
| created_by | Eugene Blikh |
| metadata | <binary> |
| thread_id | |
| depends_on_issue_id | tarantool-etcd-6js |
| depends_on_wisp_id | NULL |
| depends_on_external | NULL |
| id | a9139d4e-ecc4-5a12-94a5-7105b5a44b26 |
| issue_id | tarantool-etcd-ovo |
| type | parent-child |
| created_at | 2026-05-20T09:47:29Z |
| created_by | Eugene Blikh |
| metadata | <binary> |
| thread_id | |
| depends_on_issue_id | tarantool-etcd-cnj |
| depends_on_wisp_id | NULL |
| depends_on_external | NULL |
| id | 315e7be9-6d93-5ed9-bee8-f5ac6acb6334 |
| issue_id | tarantool-etcd-ovo |
| event_type | label_added |
| actor | Eugene Blikh |
| old_value | NULL |
| new_value | NULL |
| comment | Added label: milestone:m5-clustering |
| created_at | 2026-05-21T14:37:38Z |
| id | f09c9c57-f1a2-5a14-8e2a-f80de1b83eb5 |
| issue_id | tarantool-etcd-ovo |
| event_type | created |
| actor | Eugene Blikh |
| old_value | |
| new_value | |
| comment | NULL |
| created_at | 2026-05-20T09:45:16Z |
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