statistics, schedule: stop republishing metrics for a known-tombstoned store - #11166
statistics, schedule: stop republishing metrics for a known-tombstoned store#11166bufferflies wants to merge 8 commits into
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…d store Two writers never checked IsRemoved() at all, unlike observe()'s existing early return: ObserveHotStat kept refreshing storeStatusGauge every collection tick for as long as RollingStoreStats existed for the store (recreatable by a StoreHeartbeat already in flight when bury happened, since HandleStoreHeartbeat only rejects a fully unknown store), and collectHotMetrics kept refreshing hotSpotStatusGauge from HotPeerCache's still-cached hot-peer data, since HotPeerCache.gc() only clears it on its own TTL-throttled schedule, not every tick. Both now treat a known-tombstoned store as not having data to publish, so they stop at the source instead of relying on a periodic backstop -- matching observe()'s established pattern and keeping the post-write recheck's DeletePartialMatch cost bounded to the one tick where a stale snapshot could actually cause a recreation. Signed-off-by: bufferflies <1045931706@qq.com>
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📝 WalkthroughWalkthroughThe change expands removed-store cleanup across hot metrics, history loads, reverse indexes, placement caches, store limits, and network-slow metrics. Tombstoning and deletion now invalidate related state. ChangesRemoved-store cleanup
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The change prevents metrics and cached store data from being republished after tombstoning, but one regression test does not yet prove the stale-snapshot case it is intended to cover. The PR is otherwise mergeable with explicit owner awareness and a small follow-up to strengthen that test. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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✨ Finishing Touches🧪 Generate unit tests (beta)
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Please address the blocking inline comment and add the regression test.
| } | ||
|
|
||
| stat, hasHotPeer := status.AsPeer[storeID] | ||
| hasHotPeer = hasHotPeer && !removed |
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Blocking: this change now deletes HotPendingSum for a tombstoned snapshot, but summaryPendingInfluence is still an unconditional writer. SummaryStoreInfos(cluster.GetStores()) includes tombstoned stores, and pkg/schedule/schedulers/hot_region.go:187-193 writes HotPendingSum whenever a pending hot-region operator still has influence. After the bury-time cleanup or this collector deletes the series, the next scheduler round can recreate it while the operator remains in its zombie period. The removed store can therefore still expose pd_scheduler_hot_pending_sum.
Please guard the source write with !info.IsRemoved() (or apply an equivalent source-side cleanup), and add a regression test. The following test should fail with the current implementation and pass after the guard. Add the prometheus/testutil import to hot_region_test.go.
func TestSummaryPendingInfluenceSkipsRemovedStoreMetric(t *testing.T) {
re := require.New(t)
defer HotPendingSum.Reset()
hb := newBaseHotScheduler(nil, 0, 0, initHotRegionScheduleConfig())
storeID := uint64(1)
loads := make([]float64, utils.RegionStatCount)
loads[utils.RegionWriteBytes] = 1
storeInfos := map[uint64]*statistics.StoreSummaryInfo{
storeID: {
StoreInfo: core.NewStoreInfo(&metapb.Store{
Id: storeID,
NodeState: metapb.NodeState_Removed,
}),
PendingSum: &statistics.Influence{Loads: loads},
},
}
metric := HotPendingSum.WithLabelValues("1", utils.Write.String(), utils.DimToString(utils.ByteDim))
metric.Set(42)
hb.summaryPendingInfluence(storeInfos)
re.Equal(float64(42), testutil.ToFloat64(metric))
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Fixed in d5edd6c: guarded the write in summaryPendingInfluence with a removed-store check, and added TestSummaryPendingInfluenceSkipsRemovedStoreMetric (fails on the prior head, passes after the guard).
[LGTM Timeline notifier]Timeline:
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…kv#11127 Close several residual leaks found after tikv#11127/tikv#11166 landed: - SetStoreLimit and adjustNetworkSlowStore could still re-add a tombstoned store's config/metric entry through an in-flight call that raced past bury. - hot_peer_cache's storesOfRegion reverse index, the hot scheduler's per-store history load cache, and the rule fit cache's per-store cache never had a removed-store cleanup path at all. - deleteStore's auto-GC callers (the 30-day tombstone timer) never cleared the store-limit config entry; only the manual remove-tombstone path did, via a redundant call now folded into deleteStore itself. Each fix reuses the bury/final-removal one-shot cleanup pattern already established in this area, with a write-side IsRemoved() check added where the write path had none at all. Known limitation: SetStoreLimit's check-then-act against GetStore is not atomic with BuryStoreLocked/deleteStore (they don't share a lock), so a call that reads the store as not-yet-removed can still land after bury clears the config. Closing this needs either a dedicated lock or a locked/unlocked split mirroring BuryStore/BuryStoreLocked -- out of scope here; the window requires a store to complete bury and manual removal within a single SetStoreLimit call, and GetStore()==nil can't be used as a shortcut since callers legitimately set a store's limit before the store itself is registered. Signed-off-by: bufferflies <1045931706@qq.com>
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| // buried or finally removed; a stale RegionInfo snapshot that | ||
| // still lists it as a peer must not re-add it here, or it would | ||
| // linger in storeCaches for good since nothing sweeps it again. | ||
| if !s.IsRemoved() { |
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A concurrent FitRegion can retain a pre-bury live StoreInfo, run after RemoveStoreCache, pass this snapshot check, and reinsert the deleted entry. Later tombstone snapshots create an ephemeral cache but do not delete that reinserted map entry, so it can remain for the process lifetime.
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Please add a deterministic unit regression test for this stale-snapshot path. The test must reuse the same live StoreInfo after RemoveStoreCache, because the current !s.IsRemoved() guard does not cover a pre-bury snapshot:
func TestToStoreCacheListDoesNotReinsertStaleStore(t *testing.T) {
re := require.New(t)
manager := NewRegionRuleFitCacheManager()
live := core.NewStoreInfo(&metapb.Store{
Id: 1,
NodeState: metapb.NodeState_Serving,
})
manager.toStoreCacheList([]*core.StoreInfo{live})
manager.RemoveStoreCache(1)
manager.toStoreCacheList([]*core.StoreInfo{live}) // stale FitRegion snapshot
_, ok := manager.storeCaches[1]
re.False(ok)
}This test fails on the current head and passes only when cache insertion is synchronized with removal or otherwise rejects stale snapshots. Without that guarantee, a deleted entry can be reintroduced and survive indefinitely.
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Fixed in d1b7f82: threaded StoreSet through SetCache/toRegionRuleFitCache/toStoreCacheList so the removed-store check re-reads the store fresh at write time instead of trusting the possibly-stale FitRegion snapshot. Added TestToStoreCacheListDoesNotReinsertStaleStore in 4a04da5 per the requested regression test (fails on the prior head, passes after the fix).
| // needs to be cleared here rather than by the manual remove-tombstone caller | ||
| // alone -- otherwise a store reclaimed purely by the 30-day auto-GC timer | ||
| // never gets this cleanup at all. | ||
| c.RemoveStoreLimit(store.GetID()) |
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If RemoveStoreLimit exhausts its persistence retries here, deleteStore still returns success after the store metadata and in-memory record are gone. No later GC pass can retry the cleanup, so a restart can reload the stale store-limit entry and republish its metric.
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Please add a unit test for the exhausted-persistence path. It must verify durable state, not only the in-memory schedule config:
func TestDeleteStoreDoesNotLoseStoreLimitCleanup(t *testing.T) {
re := require.New(t)
// Create and persist a store-limit entry before injecting the failure.
// Use a tombstone store and the same storage instance for the cluster and reload.
re.NoError(cluster.SetStoreLimit(storeID, storelimit.AddPeer, 60))
const persistFail = "github.com/tikv/pd/server/config/persistFail"
re.NoError(failpoint.Enable(persistFail, "return(true)"))
err := cluster.deleteStore(tombstone) // all five cleanup attempts fail
re.NoError(failpoint.Disable(persistFail))
// The deletion must report the cleanup failure or enqueue a retry.
re.Error(t, err)
// After the retry path runs, reload the config from storage and verify
// that StoreLimit no longer contains storeID.
}The test should force every in-method retry to fail, then clear the failure and exercise the retry path added by the fix. The final assertion must reload from durable storage. The current implementation returns success and has no later path that retries RemoveStoreLimit, so the stale entry remains after restart.
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Confirmed but not adding the requested test: it would demonstrate an accepted gap rather than a behavior change. Tracked in the PR description's Known limitations -- closing it needs either a startup reconciliation between StoresInfo and the persisted StoreLimit config, or making RemoveStoreLimit's failure retryable/observable, both out of scope here given how narrow the trigger is.
| // here: callers legitimately set a store's limit before the store itself | ||
| // is registered (see testCluster.addRegionStore), so nil just means | ||
| // "not created yet," not "already gone." | ||
| if store := c.GetStore(storeID); store != nil && store.IsRemoved() { |
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This check is not synchronized with BuryStoreLocked: the call can pass it, then burial removes the entry, and the subsequent mutation and persistence recreate it. Because tombstone cleanup is one-shot, the stale config and StoreLimitGauge can survive until final removal.
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Please add a deterministic unit test for the check-then-act race. A concurrent test without a barrier is not sufficient:
func TestSetStoreLimitCannotRecreateRemovedStore(t *testing.T) {
re := require.New(t)
// Pause SetStoreLimit immediately after its IsRemoved check.
// The test-only barrier must signal that the check has passed.
done := make(chan error, 1)
go func() {
done <- cluster.SetStoreLimit(storeID, storelimit.AddPeer, 60)
}()
<-afterRemovedCheck
// Bury the store while SetStoreLimit is paused, then release it.
re.NoError(cluster.BuryStore(storeID, true))
close(releaseSetStoreLimit)
re.ErrorIs(<-done, errs.ErrStoreRemoved)
_, ok := cluster.GetOpts().GetScheduleConfig().StoreLimit[storeID]
re.False(ok)
}Please implement the barrier with a test-only failpoint or an equivalent injectable seam, and disable it with cleanup. The test must prove that the operation cannot mutate or persist the tombstoned store after burial; the current check is not atomic with the subsequent config mutation.
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Confirmed, tracked in the PR description's Known limitations (updated to also cover the final-removal case raised separately below). Not adding the requested test or synchronization: reusing storeStateLock here would deadlock, since RemoveStore/UpStore already hold it while calling SetStoreLimit internally, and a dedicated lock or locked/unlocked split is more surgery than this narrow window warrants.
| // re-check here (unlike the metric write below, which has no such guard) is | ||
| // the only thing that can stop it from staying republished until final | ||
| // removal. | ||
| if store := c.GetStore(storeID); store == nil || store.IsRemoved() { |
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This recheck is not atomic with BuryStoreLocked: burial can complete after the check and delete the metric, then this in-flight heartbeat can execute TriggerNetworkSlowEvict and increment the series again. With no later heartbeat for the tombstoned store, the recreated state can survive until final removal.
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Please add a deterministic unit test for the equivalent race in adjustNetworkSlowStore:
func TestAdjustNetworkSlowStoreCannotRepublishAfterBury(t *testing.T) {
re := require.New(t)
defer storeTriggerNetworkSlowEvict.Reset()
// Seed a score at or above networkSlowStoreEvictThreshold.
// Pause after the removed-store recheck and before TriggerNetworkSlowEvict.
done := make(chan struct{})
go func() {
cluster.adjustNetworkSlowStore(storeID)
close(done)
}()
<-afterNetworkSlowCheck
re.NoError(cluster.BuryStore(storeID, true))
close(releaseNetworkSlowStore)
<-done
re.Zero(testutil.ToFloat64(
storeTriggerNetworkSlowEvict.WithLabelValues(strconv.FormatUint(storeID, 10)),
))
}The barrier must be test-only and deterministic. The current recheck can pass, burial can delete the label, and the in-flight call can then increment the counter again. The assertion must inspect the metric after the in-flight call completes.
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Confirmed, same non-atomicity as SetStoreLimit above, but bounded: deleteStore's storeTriggerNetworkSlowEvict.DeleteLabelValues call runs on both the manual remove-tombstone and 30-day auto-GC paths, so any recreated series is cleared by final removal at the latest. Not adding synchronization for the same reason as the SetStoreLimit case.
| stores := cluster.GetStores() | ||
| storeInfos := statistics.SummaryStoreInfos(stores) | ||
| s.summaryPendingInfluence(storeInfos) | ||
| s.stHistoryLoads.GC(stores) |
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The new GC call removes a removed store from StoreHistoryLoads, but SummaryStoresLoad immediately calls Add for every store that passes the collector filter. Since storeInfos still contains tombstoned stores and the RegionKind TiKV filter does not reject them, the same scheduler round recreates the history entry after GC.
Please add this regression test:
func TestHistoryGCDoesNotReaddRemovedStore(t *testing.T) {
re := require.New(t)
history := NewStoreHistoryLoads(time.Minute, 0)
rw := utils.Read
kind := constant.RegionKind
storeID := uint64(1)
live := core.NewStoreInfo(&metapb.Store{
Id: storeID,
NodeState: metapb.NodeState_Serving,
})
infos := map[uint64]*StoreSummaryInfo{
storeID: {StoreInfo: live},
}
loads := map[uint64]StoreKindLoads{
storeID: {1, 0, 0, 0, 0},
}
SummaryStoresLoad(infos, loads, history, nil, false, rw, kind)
re.NotEmpty(history.Get(storeID, rw, kind)[0])
removed := live.Clone(core.SetStoreState(metapb.StoreState_Tombstone))
history.GC([]*core.StoreInfo{removed})
re.Empty(history.Get(storeID, rw, kind)[0])
SummaryStoresLoad(
map[uint64]*StoreSummaryInfo{storeID: {StoreInfo: removed}},
loads, history, nil, false, rw, kind,
)
re.Empty(history.Get(storeID, rw, kind)[0])
}This test fails on the current head because the final SummaryStoresLoad call recreates the entry. The fix must either exclude removed stores from the writer or move GC after all writers.
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Fixed in d5edd6c: guarded the write in summaryStoresLoadByEngine with !store.IsRemoved(), and added TestHistoryGCDoesNotReaddRemovedStore exactly as proposed (fails on the prior head, passes after the guard).
| // here: callers legitimately set a store's limit before the store itself | ||
| // is registered (see testCluster.addRegionStore), so nil just means | ||
| // "not created yet," not "already gone." | ||
| if store := c.GetStore(storeID); store != nil && store.IsRemoved() { |
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The new tombstone rejection currently breaks the required pull-unit-test-next-gen-2 job: TestGetPutConfig reaches this path while preparing the second tombstone-state case and now returns ErrStoreRemoved at tests/server/cluster/cluster_test.go:548. Until the intended contract and the existing test flow agree, this PR cannot pass the required suite.
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…residuals; fix CI Three review findings on top of this PR's earlier fixes: lhy1024 (coordinator.go): summaryPendingInfluence wrote HotPendingSum unconditionally from storeInfos (which includes tombstoned stores), so a pending influence entry still in its zombie period kept recreating the series every Schedule() round right after bury/collectHotMetrics deleted it. Guard the write with IsRemoved(). rleungx (region_rule_cache.go): toStoreCacheList's IsRemoved() check ran against the same stores slice captured before FitRegion's rule-fit computation, not a fresh read -- a store buried while that computation was still running could slip past it and get re-added to storeCaches with no further cleanup opportunity. Thread the StoreSet through SetCache down to toStoreCacheList so the check re-reads the store fresh at write time instead of trusting the possibly-stale snapshot. lhy1024 (hot_region.go): the GC(stores) call added earlier in prepareForBalance ran before the same call's own prepare()/ SummaryStoresLoad, which writes back into StoreHistoryLoads unconditionally for any store the collector's filter lets through -- and the RegionKind filter doesn't reject removed stores. That made the GC call a no-op for RegionKind every time the interval gate opened, not a narrow race. Guard the write in summaryStoresLoadByEngine instead. Each fix adds a regression test that fails on the prior head and passes after the guard. Also fix a CI break rleungx reported on pull-unit-test-next-gen-2: SetStoreLimit's earlier tombstone check rejected tests/server/cluster/cluster_test.go's testStateAndLimit, whose setup calls SetStoreLimit before resetting the store's state and can find the store still tombstoned from a prior call reusing the same store object. Reset to a non-removed baseline first so the setup isn't rejected by the now-enforced check. Signed-off-by: bufferflies <1045931706@qq.com>
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Inline comments:
In `@pkg/schedule/placement/region_rule_cache.go`:
- Line 102: Update toStoreCacheList and the region-cache insertion path around
toRegionRuleFitCache so a region is not cached when any current store is missing
or marked removed, including stale FitRegion snapshots completing after
RemoveStoreCache. Return and propagate a cacheable status, skip
manager.regionCaches insertion when invalid, and invalidate existing region
caches referencing the removed store or validate store state on reads.
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pkg/schedule/checker/rule_checker.gopkg/schedule/placement/region_rule_cache.gopkg/schedule/placement/region_rule_cache_test.gopkg/schedule/placement/rule_manager.gopkg/schedule/placement/rule_manager_test.gopkg/schedule/schedulers/hot_region.gopkg/schedule/schedulers/hot_region_test.gopkg/statistics/store_hot_peers_infos.gopkg/statistics/store_load_test.gotests/server/cluster/cluster_test.go
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| // entry still in its zombie period keeps republishing HotPendingSum | ||
| // for a removed store every Schedule() round, even after bury/final | ||
| // -removal or collectHotMetrics deletes the series. | ||
| if info.IsRemoved() { |
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The guard reads the StoreInfo snapshot captured by prepareForBalance before burial. If burial deletes HotPendingSum after that snapshot but before this loop writes it, info still appears live and the write recreates the series; no fresh state check runs afterward, so the tombstoned metric remains visible until a later collection pass removes it.
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Fixed in dd84e1b: threaded the cluster reference through summaryPendingInfluence so the removed-store check re-reads fresh at write time instead of trusting the snapshot captured at the top of prepareForBalance -- same fix as the earlier toStoreCacheList gap.
lhy1024 asked for a deterministic regression test covering the stale-FitRegion-snapshot path fixed in d1b7f82. Adapted to toStoreCacheList's current two-argument signature: a separate StoreSet reflects the live cluster state while the stores slice simulates an in-flight FitRegion call still holding a pre-bury snapshot. Signed-off-by: bufferflies <1045931706@qq.com>
Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## master #11166 +/- ##
=======================================
Coverage 79.48% 79.49%
=======================================
Files 544 544
Lines 77900 77949 +49
=======================================
+ Hits 61922 61966 +44
+ Misses 11647 11641 -6
- Partials 4331 4342 +11
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|
| // only exist to seed a limit before resetStoreState below establishes the | ||
| // state this specific case actually wants to test -- aren't rejected by | ||
| // SetStoreLimit's own tombstone check. | ||
| resetStoreState(re, rc, storeID, metapb.StoreState_Up) |
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This setup revives a tombstoned store through BasicCluster.PutStore, a transition that production paths reject, solely so SetStoreLimit can seed the next case. Because the tombstone cases now pass through an impossible state sequence, this CI workaround can hide ordering or lifecycle regressions that only occur when a store remains tombstoned.
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Fixed in dd84e1b: replaced the revival with skipping the SetStoreLimit setup when the store is already tombstoned. resetStoreState's own Tombstone branch clears any limit regardless, so seeding one was pointless for that case anyway, on top of faking an impossible transition.
| // GetStore returning nil is deliberately NOT treated the same as removed | ||
| // here: callers legitimately set a store's limit before the store itself | ||
| // is registered (see testCluster.addRegionStore), so nil just means | ||
| // "not created yet," not "already gone." |
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nil is also the observable state after final tombstone deletion, not only before registration. The HTTP handler checks existence before calling this method, so a concurrent deleteStore can remove the store after that check and this branch will still persist a new limit for an ID that is already gone; no later store event remains to clean it up.
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Confirmed this is reachable via the HTTP path. Not adding a store == nil check here: it's ambiguous between "not yet registered" and "already fully removed" -- SetStoreLimit is also called for a store before it's registered (see testCluster.addRegionStore, which seeds a limit before PutStore), and adding store == nil to the rejection broke TestDispatch when tried. There's no way to distinguish the two cases from inside SetStoreLimit without additional state tracking, which is disproportionate for a window this narrow: it requires a concurrent deleteStore to land between the HTTP handler's existence check and the actual SetStoreLimit call (separated by request body parsing). Tracking this in the PR description's Known limitations instead.
… test-fidelity issue Three review findings: coderabbitai (region_rule_cache.go): toStoreCacheList's storeSet re-check only guarded the per-store storeCaches write; the store-level cache entry it returns was still appended unconditionally and could get persisted into the region-level regionCaches by SetCache, even for a store storeSet shows removed. Such an entry would look valid (all of IsUnchanged's comparisons pass against the same stale snapshot) and never get re-evaluated until an unrelated region-level change invalidates it. toStoreCacheList now also returns whether the result is cacheable at all; SetCache skips inserting into regionCaches when it isn't. rleungx (hot_region.go): summaryPendingInfluence's IsRemoved() check read a StoreSummaryInfo snapshot taken at the top of prepareForBalance, so a store buried after that snapshot but before this loop's write could still slip through -- the same class of gap as the earlier toStoreCacheList fix. Thread the cluster reference through so the check re-reads the store fresh at write time instead of trusting the snapshot. rleungx (tests/server/cluster/cluster_test.go): the CI fix in an earlier commit revived a tombstoned store through BasicCluster.PutStore to make testStateAndLimit's SetStoreLimit setup pass -- a transition production code never allows (UpStore explicitly rejects IsRemoved() stores), which could mask lifecycle regressions specific to a store staying tombstoned. Skip the setup instead of faking the transition: resetStoreState's own Tombstone branch clears any limit regardless, so seeding one is both pointless and rejected once the store is already tombstoned from a prior call to this helper reusing the same store object. Signed-off-by: bufferflies <doufuxiaowanzi@gmail.com> Signed-off-by: bufferflies <1045931706@qq.com>
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Inline comments:
In `@pkg/schedule/schedulers/hot_region_test.go`:
- Around line 2662-2674: Update the test setup around storeID so tc retains the
removed store while storeInfos contains a serving StoreInfo with the same ID;
this creates a stale summary snapshot and verifies the implementation uses the
fresh cluster.GetStore(storeID) check rather than relying on info.IsRemoved().
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…tric coderabbitai: the test put the same removed StoreInfo into both the cluster and storeInfos, so it couldn't distinguish the fresh cluster.GetStore() check from a regression back to the stale info.IsRemoved() check -- both would skip the write since the same object reports removed either way. Give storeInfos a separate, stale StoreInfo still showing the store as serving, matching what a snapshot taken before bury would look like. Verified the corrected test fails against a reverted (snapshot-only) check and passes against the fix. Signed-off-by: bufferflies <doufuxiaowanzi@gmail.com> Signed-off-by: bufferflies <1045931706@qq.com>
| return | ||
| } | ||
| manager.regionCaches[region.GetID()] = manager.toRegionRuleFitCache(region, fit) | ||
| newCache, cacheable := manager.toRegionRuleFitCache(storeSet, region, fit) |
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cacheable is only evaluated when no region entry exists. If burial lands after a stale CheckAndGetCache hit but before SetCache, the existing-entry branch can still promote that stale fit to bestFit; RemoveStoreCache leaves regionCaches intact, so another in-flight stale snapshot can consume a fit that includes the removed store.
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Blocking: SetCache still skips the fresh storeSet validation when a region entry already exists. RemoveStoreCache only removes storeCaches, so the regionCaches entry survives burial. A FitRegion call that captured the live store before burial can then finish after burial and enter this branch; it increments hitCount and promotes the stale fit without checking the current store state. Another in-flight caller with the same stale snapshot can then consume a fit that still contains the tombstoned store, which is a placement and scheduling correctness issue.
Please validate the current storeSet before updating an existing region entry, or invalidate region entries that involve the removed store. Please also add a deterministic regression test, for example:
func TestSetCacheDoesNotPromoteStaleFitAfterStoreRemoval(t *testing.T) {
re := require.New(t)
manager := NewRegionRuleFitCacheManager()
stores := mockStores(3)
storeSet := core.NewStoresInfo()
for _, store := range stores {
storeSet.PutStore(store)
}
region := mockRegion(3, 0)
rules := addExtraRules(0)
fit := fitRegion(stores, region, rules, false)
fit.regionStores = stores
fit.rules = rules
manager.SetCache(storeSet, region, fit)
cache := manager.regionCaches[region.GetID()]
re.NotNil(cache)
cache.hitCount = minHitCountToCacheHit - 1
manager.RemoveStoreCache(stores[0].GetID())
storeSet.PutStore(stores[0].Clone(
core.SetStoreState(metapb.StoreState_Tombstone),
))
manager.SetCache(storeSet, region, fit) // stale pre-bury fit
cache, ok := manager.regionCaches[region.GetID()]
re.False(ok && cache.bestFit != nil)
}This test fails on the current head because the existing-entry branch promotes fit, and passes once that branch handles the fresh removed-store state.
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Fixed in 89d1b6a: validate storeSet before promoting fit to bestFit in the existing-entry branch, and evict the cache entry (not just skip the promotion) when validation fails, since another in-flight caller with an equally stale snapshot could otherwise still consume it via CheckAndGetCache -- that compares against this cache's own frozen regionStores, not a fresh storeSet check. Added TestSetCacheDoesNotPromoteStaleFitAfterStoreRemoval exactly as proposed (fails on the prior head, passes after the fix).
Three findings from a systematic sweep for remaining tombstone leaks: - placementStatusGauge (store_collection.go) was written with a store label but never cleaned up anywhere -- unlike storeStatusGauge, clusterStatusGauge, and StoreLimitGauge, which ResetStoreStatistics already covers. A tombstoned store's series stayed frozen forever. Add it to ResetStoreStatistics. - detectAndHandleNetworkSlowStores (evict_slow_store.go) evaluated every store cluster.GetStores() returns, including tombstoned ones, with no IsRemoved() check. A tombstoned store's GetNetworkSlowScores() is frozen at its last reported value; if it still looked slow, this would add the store to networkSlowStoreRecoverStartAts and publish evictedSlowStoreStatusGauge for it, even though the very next scheduling round's tryRecoverNetworkSlowStores would undo it. Skip removed stores at the source instead. - recorder.refresh (rule_checker.go) ranged over offlineLeaderCounter (map[uint64]uint64, storeID -> count) with `for _, storeID := range`, binding storeID to the map *value* (the count) instead of the key. The TTL cleanup this was supposed to drive -- clearing the whole counter once a tracked store is gone -- essentially never fired correctly. Each fix adds a regression test that fails on the prior head and passes after the fix. Signed-off-by: bufferflies <doufuxiaowanzi@gmail.com> Signed-off-by: bufferflies <1045931706@qq.com>
| // networkSlowStoreRecoverStartAts and publish evictedSlowStoreStatusGauge | ||
| // for it here, even though tryRecoverNetworkSlowStores would just remove | ||
| // it again on the very next scheduling round. | ||
| if store.IsRemoved() { |
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Blocking: this check filters only the candidate evaluation loop. problematicNetwork was built from the original stores slice above, and isNetworkSlowStore still receives that same slice. A tombstoned store can therefore contribute its frozen network-score data and is still counted in the denominator used by the “all other stores report problems” check.
For example, with four live stores and one tombstoned store, if the three live peers report store 1 as problematic, the live-only denominator is 3 and store 1 should be detected. The current denominator is 4, so the live slow store is missed. This can leave a real network-slow store untreated and change leader-transfer scheduling.
Please build the problematic-network map and the evaluation population from live stores, and ignore score entries whose reporter or target store is missing or removed. Add a deterministic regression test, for example:
func (suite *evictSlowStoreTestSuite) TestNetworkSlowStoreUsesOnlyLiveStores() {
re := suite.Require()
es := suite.es.(*evictSlowStoreScheduler)
suite.tc.AddLeaderStore(storeID5, 0)
scores := map[uint64]map[uint64]uint64{
storeID1: {
storeID2: 100,
storeID3: 100,
storeID4: 100,
},
storeID2: {
storeID1: 100,
storeID3: 1,
},
storeID3: {
storeID1: 100,
storeID2: 1,
},
storeID4: {
storeID1: 100,
storeID2: 1,
},
storeID5: {
storeID1: 1,
storeID2: 1,
},
}
for storeID, networkScores := range scores {
store := suite.tc.GetStore(storeID)
suite.tc.PutStore(store.Clone(func(store *core.StoreInfo) {
store.GetStoreStats().NetworkSlowScores = networkScores
}))
}
suite.tc.PutStore(suite.tc.GetStore(storeID5).Clone(
core.SetStoreState(metapb.StoreState_Tombstone),
))
es.scheduleNetworkSlowStore(suite.tc)
re.Contains(es.conf.networkSlowStoreRecoverStartAts, uint64(storeID1))
}This test is deterministic and fails on the current head because the tombstoned store makes the denominator 4; it passes when all network-slow calculations use only live stores.
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Fixed the denominator/reporter part in 89d1b6a: problematicNetwork and the "how many stores must agree" count in isNetworkSlowStore now come from a live-only store list. Added TestNetworkSlowStoreUsesOnlyLiveStores per your example (fails on the prior head, passes after the fix).
Also tried filtering score entries whose target is missing/removed, but reverted it: it broke TestNetworkSlowStoreReachLimit, which legitimately references a store ID as a score target before that store is ever registered via AddLeaderStore (simulating a store mid-scale-out) -- filtering by "is this store currently known" can't distinguish that from "already removed," the same nil-vs-not-yet-registered ambiguity as SetStoreLimit elsewhere in this PR. Happy to revisit if there's a way to close that gap that doesn't collide with the scale-out case.
…d store Pick the pure Prometheus-metric-leak subset of tikv#11166 (still open on master) onto this branch, on top of tikv#11127's backport: - ObserveHotStat / ResetStoreStatistics / Reset(): stop storeStatusGauge from being republished by an in-flight StoreHeartbeat after bury, clean up placementStatusGauge, reset StoreLimitGauge on a full leader-election reset. - collectHotMetrics: gate hasHotLeader/hasHotPeer on a single IsRemoved() read so a tombstoned store's stale HotPeerCache data can't republish hotSpotStatusGauge between HotPeerCache.gc() ticks. - SetStoreLimit: reject setting a limit on an already-tombstoned store, closing the only other write path that could re-add a cleared StoreLimitGauge/config entry. - summaryPendingInfluence: re-check each store fresh through the cluster instead of trusting the possibly-stale StoreSummaryInfo snapshot before writing HotPendingSum. Left out (not applicable to this branch): tikv#11166's evict_slow_store.go / adjustNetworkSlowStore guards (network-slow-store eviction doesn't exist here) and its memory-leak-only fixes (region rule fit cache, storesOfRegion reverse index, StoreHistoryLoads GC), which are a separate concern from metric leakage and tracked separately. Signed-off-by: bufferflies <1045931706@qq.com>
lhy1024 (region_rule_cache.go): SetCache's existing-entry branch promoted fit to bestFit without validating storeSet, unlike the cacheable-gated creation path. A FitRegion call that captured a store as live before it was buried could still reach this branch after burial and promote a fit that includes the removed store; another in-flight caller with an equally stale snapshot could then consume that bad fit directly via CheckAndGetCache (which compares against this cache's own frozen regionStores, not a fresh storeSet check), letting a removed store leak into a real scheduling decision. Validate storeSet before promoting, and evict the entry instead of just skipping the promotion -- skipping alone would leave cache.regionStores stale, so the same race could recur on the next hit. lhy1024 (evict_slow_store.go): detectAndHandleNetworkSlowStores built problematicNetwork and computed the "how many stores must agree" denominator from cluster.GetStores(), which includes tombstoned stores. A tombstoned store's frozen network scores could count toward the denominator, inflating it enough to mask a genuinely slow live store from detection. Restrict both to live stores. A further "also ignore score entries whose target is missing or removed" refinement was attempted but reverted: it broke TestNetworkSlowStoreReachLimit, which legitimately references a store ID as a score target before that store is ever registered via AddLeaderStore (simulating a store mid-scale-out) -- the same nil-vs-not-yet-registered ambiguity seen elsewhere in this area. Each fix adds the regression test requested in review, verified to fail on the prior head and pass after the fix. Signed-off-by: bufferflies <doufuxiaowanzi@gmail.com> Signed-off-by: bufferflies <1045931706@qq.com>
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…d store Pick the pure Prometheus-metric-leak subset of tikv#11166 (still open on master) onto this branch, on top of tikv#11127's backport: - ObserveHotStat / ResetStoreStatistics / Reset(): stop storeStatusGauge from being republished by an in-flight StoreHeartbeat after bury, clean up placementStatusGauge, reset StoreLimitGauge on a full leader-election reset. - collectHotMetrics: gate hasHotLeader/hasHotPeer on a single IsRemoved() read so a tombstoned store's stale HotPeerCache data can't republish hotSpotStatusGauge between HotPeerCache.gc() ticks. - SetStoreLimit: reject setting a limit on an already-tombstoned store, closing the only other write path that could re-add a cleared StoreLimitGauge/config entry. - summaryPendingInfluence: re-check each store fresh through the cluster instead of trusting the possibly-stale StoreSummaryInfo snapshot before writing HotPendingSum. Left out (not applicable to this branch): tikv#11166's evict_slow_store.go / adjustNetworkSlowStore guards (network-slow-store eviction doesn't exist here) and its memory-leak-only fixes (region rule fit cache, storesOfRegion reverse index, StoreHistoryLoads GC), which are a separate concern from metric leakage and tracked separately. Signed-off-by: bufferflies <1045931706@qq.com>
3 participants
What problem does this PR solve?
Issue Number: ref #11126
What is changed and how does it work?
Follow-up commits on this same PR close several more residuals in this
area found during review:
SetStoreLimit/adjustNetworkSlowStoreguards,
hot_peer_cache'sstoresOfRegionreverse index,StoreHistoryLoads's per-store history cache, the rule fit cache'sper-store cache (including not persisting a region-level cache entry
built from a stale, pre-bury store snapshot),
summaryPendingInfluence'sHotPendingSumwrite, anddeleteStore's auto-GC path not clearing thestore-limit config.
Known limitations
SetStoreLimit's tombstone check isn't atomic with the cluster's own store-removal machinery -- neitherBuryStoreLockednor final removal (deleteStore). An in-flight call that read the store as live can still persist after either transition completes: racing bury lands in a narrow window; racing final removal is reachable from the HTTP path too (server/api/store.go's handler checks existence before parsing the request body, then callsSetStoreLimit), and since the store is then gone for good, nothing ever retries the cleanup. Closing either needs a dedicated lock or a locked/unlocked split (mirroringBuryStore/BuryStoreLocked) -- synchronizing withstoreStateLockdirectly would deadlock, sinceRemoveStore/UpStorealready hold it while callingSetStoreLimitinternally, and the nil-vs-not-yet-registered ambiguity (seetestCluster.addRegionStore) rules out a simple nil check.adjustNetworkSlowStore's recheck has the same non-atomicity, but is bounded:deleteStore'sstoreTriggerNetworkSlowEvict.DeleteLabelValuescall runs on both the manual remove-tombstone and 30-day auto-GC paths, so any recreated series is cleared by final removal at the latest.RemoveStoreLimit's persistence retry (5 attempts, 100ms apart) can be exhausted without any later retry path. If that happens after the store is fully removed, the stale config entry in storage has no further lifecycle event to trigger cleanup, and can be reloaded and republished after a future leader election or restart. Requires either a startup reconciliation betweenStoresInfoand the persistedStoreLimitconfig, or making the failure retryable/observable -- both out of scope here given how narrow the trigger is (the persist has to fail all 5 attempts, and the store has to already be fully removed with no future bury/deletion event left to retry it).Check List
Tests
Release note
Summary by CodeRabbit