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Merge pull request #61644 from resouer/fix-deadlock

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Automatic merge from submit-queue (batch tested with PRs 61644, 61624, 61743, 61019, 61287). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Use inline func to ensure unlock is executed

**What this PR does / why we need it**:

Per discussion: https://github.com/kubernetes/kubernetes/pull/61621#issuecomment-375922184

**Special notes for your reviewer**:

Ref: #58222

**Release note**:

```release-note
Use inline func to ensure unlock is executed
```
This commit is contained in:
Kubernetes Submit Queue 2018-03-27 06:41:10 -07:00 committed by GitHub
commit 20f76dee01
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1 changed files with 46 additions and 32 deletions
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78
pkg/scheduler/core/generic_scheduler.go
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@ -455,10 +455,6 @@ func podFitsOnNode(
var (
eCacheAvailable bool
failedPredicates []algorithm.PredicateFailureReason
invalid bool
fit bool
reasons []algorithm.PredicateFailureReason
err error
)
predicateResults := make(map[string]HostPredicate)
@ -494,38 +490,54 @@ func podFitsOnNode(
// when pods are nominated or their nominations change.
eCacheAvailable = equivCacheInfo != nil && !podsAdded
for _, predicateKey := range predicates.Ordering() {
var (
fit bool
reasons []algorithm.PredicateFailureReason
err error
)
//TODO (yastij) : compute average predicate restrictiveness to export it as Prometheus metric
if predicate, exist := predicateFuncs[predicateKey]; exist {
if eCacheAvailable {
// Lock ecache here to avoid a race condition against cache invalidation invoked
// in event handlers. This race has existed despite locks in eCache implementation.
ecache.Lock()
// PredicateWithECache will return its cached predicate results.
fit, reasons, invalid = ecache.PredicateWithECache(pod.GetName(), info.Node().GetName(), predicateKey, equivCacheInfo.hash, false)
}
if !eCacheAvailable || invalid {
// we need to execute predicate functions since equivalence cache does not work
fit, reasons, err = predicate(pod, metaToUse, nodeInfoToUse)
if err != nil {
return false, []algorithm.PredicateFailureReason{}, err
}
// Use an in-line function to guarantee invocation of ecache.Unlock()
// when the in-line function returns.
func() {
var invalid bool
if eCacheAvailable {
// Store data to update eCache after this loop.
if res, exists := predicateResults[predicateKey]; exists {
res.Fit = res.Fit && fit
res.FailReasons = append(res.FailReasons, reasons...)
predicateResults[predicateKey] = res
} else {
predicateResults[predicateKey] = HostPredicate{Fit: fit, FailReasons: reasons}
}
result := predicateResults[predicateKey]
ecache.UpdateCachedPredicateItem(pod.GetName(), info.Node().GetName(), predicateKey, result.Fit, result.FailReasons, equivCacheInfo.hash, false)
// Lock ecache here to avoid a race condition against cache invalidation invoked
// in event handlers. This race has existed despite locks in equivClassCacheimplementation.
ecache.Lock()
defer ecache.Unlock()
// PredicateWithECache will return its cached predicate results.
fit, reasons, invalid = ecache.PredicateWithECache(
pod.GetName(), info.Node().GetName(),
predicateKey, equivCacheInfo.hash, false)
}
}
if eCacheAvailable {
ecache.Unlock()
if !eCacheAvailable || invalid {
// we need to execute predicate functions since equivalence cache does not work
fit, reasons, err = predicate(pod, metaToUse, nodeInfoToUse)
if err != nil {
return
}
if eCacheAvailable {
// Store data to update equivClassCacheafter this loop.
if res, exists := predicateResults[predicateKey]; exists {
res.Fit = res.Fit && fit
res.FailReasons = append(res.FailReasons, reasons...)
predicateResults[predicateKey] = res
} else {
predicateResults[predicateKey] = HostPredicate{Fit: fit, FailReasons: reasons}
}
result := predicateResults[predicateKey]
ecache.UpdateCachedPredicateItem(
pod.GetName(), info.Node().GetName(),
predicateKey, result.Fit, result.FailReasons, equivCacheInfo.hash, false)
}
}
}()
if err != nil {
return false, []algorithm.PredicateFailureReason{}, err
}
if !fit {
@ -533,7 +545,9 @@ func podFitsOnNode(
failedPredicates = append(failedPredicates, reasons...)
// if alwaysCheckAllPredicates is false, short circuit all predicates when one predicate fails.
if !alwaysCheckAllPredicates {
glog.V(5).Infoln("since alwaysCheckAllPredicates has not been set, the predicate evaluation is short circuited and there are chances of other predicates failing as well.")
glog.V(5).Infoln("since alwaysCheckAllPredicates has not been set, the predicate" +
"evaluation is short circuited and there are chances" +
"of other predicates failing as well.")
break
}
}