wdgzyjx/myxce
1
0
Fork 0
forked from lei.chen/myxce
Code Pull requests Activity

feat(ha-commit-durability): durable-backed vote/PreVote freshness floor + bare-durable candidate advertise (task 4.2)

Browse source
This commit is contained in:
Rongsong Shen 2026-06-18 09:02:11 +00:00
parent 4b7457144c
commit 3049b620f3
7 changed files with 282 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

28
src/controller/cluster.c
View file

@ -378,13 +378,18 @@ static int myreq_handler(vtask_t* task)
uint64_t cand_lsn = vrq ? vrq->last_log_lsn : 0;
uint64_t cand_term = vrq ? vrq->term : 0;
uint64_t local_tag = c->myconf->config_version_tag;
uint64_t local_lsn = (uint64_t)atomic_load_explicit(
&c->ha.applied_lsn, memory_order_acquire);
/* Task 4.2 (ha-commit-durability): the voter floor's local-state LSN
* input is the DURABLE WAL tip (persist_durable_floor), not the
* volatile applied_lsn. A voter must not demand of a candidate a log
* position it itself only holds volatilely, and a truncating restart
* must lower this voter's floor to its real durable state. */
uint64_t local_lsn = persist_durable_floor(&c->persist);
/* Election-safety fix #2: the freshness floor is the max of our local
* state and our learned-committed cluster state, so we deny candidates
* that are outdated against what the cluster has already committed
* (not merely against our local config file / applied LSN). */
/* Election-safety fix #2 (retained): the freshness floor is the max of
* our local DURABLE state and our learned-committed cluster state, so we
* deny candidates that are outdated against what the cluster has already
* committed — the learned_committed backstop stays on the voter axis
* (bug-339 / design §1b). */
uint64_t my_tag = 0, my_lsn = 0;
ha_vote_self_freshness(&c->ha, local_tag, local_lsn, &my_tag, &my_lsn);
@ -463,11 +468,14 @@ static int myreq_handler(vtask_t* task)
uint64_t cand_lsn = vrq ? vrq->last_log_lsn : 0;
uint64_t cand_term = vrq ? vrq->term : 0;
uint64_t local_tag = c->myconf->config_version_tag;
uint64_t local_lsn = (uint64_t)atomic_load_explicit(
&c->ha.applied_lsn, memory_order_acquire);
/* Task 4.2 (ha-commit-durability): voter-floor local-state LSN is the
* DURABLE WAL tip (persist_durable_floor), not the volatile applied_lsn
* — same change as the real-vote path above. */
uint64_t local_lsn = persist_durable_floor(&c->persist);
/* Effective freshness floor: max of local state and learned-committed
* cluster state (election-safety fix #2, reused unchanged). */
/* Effective freshness floor: max of local DURABLE state and
* learned-committed cluster state (election-safety fix #2 backstop
* retained on the voter axis — design §1b). */
uint64_t my_tag = 0, my_lsn = 0;
ha_vote_self_freshness(&c->ha, local_tag, local_lsn, &my_tag, &my_lsn);