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Fix elect priority scn for raw_write leader.

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This commit is contained in:
obdev
2023-03-06 03:13:32 +00:00
committed by ob-robot
parent 5722d40f35
commit 085ddb9d8b
1 changed files with 17 additions and 7 deletions
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20
src/logservice/leader_coordinator/election_priority_impl/election_priority_v1.cpp
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@ -81,11 +81,11 @@ int PriorityV1::compare(const AbstractPriority &rhs, int &result, ObStringHolder
}
// | Leader | Follower
// ----------|----------------|-----------------
// ----------|------------------------------|-----------------
// APPEND | max_scn | max_replayed_scn
// ----------|----------------|-----------------
// RAW_WRITE | replayable_scn | max_replayed_scn
// ----------|----------------|-----------------
// ----------|------------------------------|-----------------
// RAW_WRITE | min(replayable_scn, max_scn) | max_replayed_scn
// ----------|------------------------------|-----------------
// OTHER | like RAW_WRITE
int PriorityV1::get_scn_(const share::ObLSID &ls_id, SCN &scn)
{
@ -96,6 +96,7 @@ int PriorityV1::get_scn_(const share::ObLSID &ls_id, SCN &scn)
palf::AccessMode access_mode = palf::AccessMode::INVALID_ACCESS_MODE;
ObLogService* log_service = MTL(ObLogService*);
common::ObRole role;
SCN replayable_scn, max_scn;
int64_t unused_pid = -1;
if (OB_ISNULL(log_service)) {
COORDINATOR_LOG_(ERROR, "ObLogService is nullptr");
@ -114,9 +115,18 @@ int PriorityV1::get_scn_(const share::ObLSID &ls_id, SCN &scn)
if (CLICK_FAIL(palf_handle_guard.get_max_scn(scn))) {
COORDINATOR_LOG_(WARN, "get_max_scn failed");
}
} else if (CLICK_FAIL(log_service->get_log_replay_service()->get_replayable_point(scn))) {
} else if (CLICK_FAIL(log_service->get_log_replay_service()->get_replayable_point(replayable_scn))) {
COORDINATOR_LOG_(WARN, "failed to get_replayable_point");
ret = OB_SUCCESS;
} else if (CLICK_FAIL(palf_handle_guard.get_max_scn(max_scn))) {
COORDINATOR_LOG_(WARN, "get_max_scn failed");
} else {
// For LEADER in RAW_WRITE mode, scn = min(replayable_scn, max_scn)
if (max_scn < replayable_scn) {
scn = max_scn;
} else {
scn = replayable_scn;
}
}
// scn may fallback because palf's role may be different with apply_service.
// So we need check it here to keep inc update semantic.