min-safe-ts: fix MinSafeTS might be set to MaxUint64 permanently #994
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Signed-off-by: husharp <[email protected]>
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disksing
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Oct 7, 2023
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@JmPotato PTAL, thx! |
JmPotato
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tikv/kv.go
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| if val.(uint64) == uint64(math.MaxUint64) { | ||
| return 0 | ||
| } |
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The key point is to prevent the MinSafeTS from not being updated permanently because of MaxUint64. We should handle it from the updater rather than just the getter.
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The core question is the getter
- we introduce
PD APIto not executego func which for KV request, resulting in not updatingsafeTSMap.updateMinSafeTSrelies onsafeTSMapwhich makes sense(because actually, we can callupdateMinSafeTStokvReuqestUpdater[to indicate func base]).
- And we need to update
minsafeTSto make sure when API fails we can fall back to the original way which is by kv request. - But the core problem is:
updateMinSafeTSwill returnmaxUnit64when the first kv request returns 0[maybe kv is not initialized] and then althoughPD APIreturns correctly, TS can not changemaxUnit64.- to resolve this question, we need to regard
maxUnit64as 0 which means there is an initial state.
- to resolve this question, we need to regard
Signed-off-by: husharp <[email protected]>
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@nolouch PTAL as well, thx! |
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Oct 8, 2023
Signed-off-by: husharp <[email protected]>
Signed-off-by: husharp <[email protected]>
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Co-authored-by: cfzjywxk <[email protected]> Co-authored-by: cfzjywxk <[email protected]> Co-authored-by: disksing <[email protected]> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: zzm <[email protected]> Co-authored-by: husharp <[email protected]> Co-authored-by: you06 <[email protected]> Co-authored-by: buffer <[email protected]> Co-authored-by: 3pointer <[email protected]> Co-authored-by: buffer <[email protected]> Co-authored-by: husharp <[email protected]> Co-authored-by: crazycs520 <[email protected]> Co-authored-by: Smilencer <[email protected]> Co-authored-by: ShuNing <[email protected]> Co-authored-by: zyguan <[email protected]> Co-authored-by: Jack Yu <[email protected]> Co-authored-by: Weizhen Wang <[email protected]> Co-authored-by: lucasliang <[email protected]> Co-authored-by: healthwaite <[email protected]> Co-authored-by: xufei <[email protected]> Co-authored-by: JmPotato <[email protected]> Co-authored-by: ekexium <[email protected]> Co-authored-by: 山岚 <[email protected]> Co-authored-by: glorv <[email protected]> Co-authored-by: Yongbo Jiang <[email protected]> resolve locks interface for tidb gc_worker (#945) fix some issues of replica selector (#910) (#942) fix some issues of replica selector (#910) fix issue of configure kv timeout not work when disable batch client (#980) fix batch-client wait too long and add some metrics (#973) fix batch-client wait too long and add some metrics (#973)" (#984) fix data race at the aggressiveLockingDirty (#913) fix MinSafeTS might be set to MaxUint64 permanently (#994) fix: fix invalid nil pointer when trying to record Store.SlownessStat. (#1017) Fix batch client batchSendLoop panic (#1021) fix request source tag unset (#1025) Fix comment of `SuspendTime` (#1057)
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close #991
The core question is the getter
PD APIto not executego func which for KV request, resulting in not updatingsafeTSMap.updateMinSafeTSrelies onsafeTSMapwhich makes sense(because actually, we can callupdateMinSafeTStokvReuqestUpdater[to indicate func base]).minsafeTSto make sure when API fails we can fall back to the original way which is by kv request.updateMinSafeTSwill returnmaxUnit64when the first kv request returns 0 and then althoughPD APIreturns correctly[maybe kv is not initialized], TS can not changemaxUnit64.maxUnit64as 0 which means there is an initial state.