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metacache: Add option for life extension (#10837)

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Add `MINIO_API_EXTEND_LIST_CACHE_LIFE` that will extend 
the life of generated caches for a while.

This changes caches to remain valid until no updates have been 
received for the specified time plus a fixed margin.

This also changes the caches from being invalidated when the *first* 
set finishes until the *last* set has finished plus the specified time 
has passed.
master
Klaus Post 4 years ago committed by GitHub
parent b72cac4cf3
commit 0724205f35
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 66 additions and 15 deletions
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  1. 13
      cmd/config/api/api.go
  2. 9
      cmd/handler-api.go
  3. 21
      cmd/metacache-bucket.go
  4. 3
      cmd/metacache.go
  5. 35
      cmd/metacache_test.go

13
cmd/config/api/api.go
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@ -35,6 +35,7 @@ const (
apiCorsAllowOrigin = "cors_allow_origin"
apiRemoteTransportDeadline = "remote_transport_deadline"
apiListQuorum = "list_quorum"
apiExtendListCacheLife = "extend_list_cache_life"
EnvAPIRequestsMax = "MINIO_API_REQUESTS_MAX"
EnvAPIRequestsDeadline = "MINIO_API_REQUESTS_DEADLINE"
@ -42,6 +43,7 @@ const (
EnvAPICorsAllowOrigin = "MINIO_API_CORS_ALLOW_ORIGIN"
EnvAPIRemoteTransportDeadline = "MINIO_API_REMOTE_TRANSPORT_DEADLINE"
EnvAPIListQuorum = "MINIO_API_LIST_QUORUM"
EnvAPIExtendListCacheLife = "MINIO_API_EXTEND_LIST_CACHE_LIFE"
EnvAPISecureCiphers = "MINIO_API_SECURE_CIPHERS"
)
@ -78,6 +80,10 @@ var (
Key: apiListQuorum,
Value: "optimal",
},
config.KV{
Key: apiExtendListCacheLife,
Value: "0s",
},
}
)
@ -89,6 +95,7 @@ type Config struct {
CorsAllowOrigin []string `json:"cors_allow_origin"`
RemoteTransportDeadline time.Duration `json:"remote_transport_deadline"`
ListQuorum string `json:"list_strict_quorum"`
ExtendListLife time.Duration `json:"extend_list_cache_life"`
}
// UnmarshalJSON - Validate SS and RRS parity when unmarshalling JSON.
@ -163,6 +170,11 @@ func LookupConfig(kvs config.KVS) (cfg Config, err error) {
return cfg, errors.New("invalid value for list strict quorum")
}
listLife, err := time.ParseDuration(env.Get(EnvAPIExtendListCacheLife, kvs.Get(apiExtendListCacheLife)))
if err != nil {
return cfg, err
}
return Config{
RequestsMax: requestsMax,
RequestsDeadline: requestsDeadline,
@ -170,5 +182,6 @@ func LookupConfig(kvs config.KVS) (cfg Config, err error) {
CorsAllowOrigin: corsAllowOrigin,
RemoteTransportDeadline: remoteTransportDeadline,
ListQuorum: listQuorum,
ExtendListLife: listLife,
}, nil
}

9
cmd/handler-api.go
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@ -33,6 +33,7 @@ type apiConfig struct {
requestsPool chan struct{}
clusterDeadline time.Duration
listQuorum int
extendListLife time.Duration
corsAllowOrigins []string
}
@ -65,6 +66,7 @@ func (t *apiConfig) init(cfg api.Config, setDriveCount int) {
t.requestsPool = make(chan struct{}, apiRequestsMaxPerNode)
t.requestsDeadline = cfg.RequestsDeadline
t.listQuorum = cfg.GetListQuorum()
t.extendListLife = cfg.ExtendListLife
}
func (t *apiConfig) getListQuorum() int {
@ -74,6 +76,13 @@ func (t *apiConfig) getListQuorum() int {
return t.listQuorum
}
func (t *apiConfig) getExtendListLife() time.Duration {
t.mu.RLock()
defer t.mu.RUnlock()
return t.extendListLife
}
func (t *apiConfig) getCorsAllowOrigins() []string {
t.mu.RLock()
defer t.mu.RUnlock()

21
cmd/metacache-bucket.go
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@ -209,12 +209,13 @@ func (b *bucketMetacache) findCache(o listPathOptions) metacache {
}
var best metacache
extend := globalAPIConfig.getExtendListLife()
for _, cached := range b.caches {
// Never return transient caches if there is no id.
if b.transient {
break
}
if cached.status == scanStateError || cached.dataVersion != metacacheStreamVersion {
if cached.status == scanStateError || cached.status == scanStateNone || cached.dataVersion != metacacheStreamVersion {
debugPrint("cache %s state or stream version mismatch", cached.id)
continue
}
@ -242,15 +243,23 @@ func (b *bucketMetacache) findCache(o listPathOptions) metacache {
// Non slash separator requires recursive.
continue
}
if cached.ended.IsZero() && time.Since(cached.lastUpdate) > metacacheMaxRunningAge {
if !cached.finished() && time.Since(cached.lastUpdate) > metacacheMaxRunningAge {
debugPrint("cache %s not running, time: %v", cached.id, time.Since(cached.lastUpdate))
// Abandoned
continue
}
if !cached.ended.IsZero() && cached.endedCycle <= o.OldestCycle {
debugPrint("cache %s ended and cycle (%v) <= oldest allowed (%v)", cached.id, cached.endedCycle, o.OldestCycle)
// If scan has ended the oldest requested must be less.
continue
if cached.finished() && cached.endedCycle <= o.OldestCycle {
if extend <= 0 {
// If scan has ended the oldest requested must be less.
debugPrint("cache %s ended and cycle (%v) <= oldest allowed (%v)", cached.id, cached.endedCycle, o.OldestCycle)
continue
}
if time.Since(cached.lastUpdate) > metacacheMaxRunningAge+extend {
// Cache ended within bloom cycle, but we can extend the life.
debugPrint("cache %s ended (%v) and beyond extended life (%v)", cached.id, cached.lastUpdate, extend+metacacheMaxRunningAge)
continue
}
}
if cached.started.Before(best.started) {
debugPrint("cache %s disregarded - we have a better", cached.id)

3
cmd/metacache.go
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@ -79,6 +79,9 @@ func (m *metacache) worthKeeping(currentCycle uint64) bool {
case cache.finished() && cache.startedCycle > currentCycle:
// Cycle is somehow bigger.
return false
case cache.finished() && time.Since(cache.lastHandout) > 48*time.Hour:
// Keep only for 2 days. Fallback if crawler is clogged.
return false
case cache.finished() && currentCycle >= dataUsageUpdateDirCycles && cache.startedCycle < currentCycle-dataUsageUpdateDirCycles:
// Cycle is too old to be valuable.
return false

35
cmd/metacache_test.go
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@ -21,7 +21,7 @@ import (
"time"
)
var metaCacheTestsetTimestamp, _ = time.Parse(time.RFC822Z, time.RFC822Z)
var metaCacheTestsetTimestamp = time.Now()
var metaCacheTestset = []metacache{
0: {
@ -80,10 +80,10 @@ var metaCacheTestset = []metacache{
status: scanStateError,
fileNotFound: false,
error: "an error lol",
started: metaCacheTestsetTimestamp.Add(time.Minute),
ended: metaCacheTestsetTimestamp.Add(2 * time.Minute),
lastUpdate: metaCacheTestsetTimestamp.Add(2 * time.Minute),
lastHandout: metaCacheTestsetTimestamp,
started: metaCacheTestsetTimestamp.Add(-20 * time.Minute),
ended: metaCacheTestsetTimestamp.Add(-20 * time.Minute),
lastUpdate: metaCacheTestsetTimestamp.Add(-20 * time.Minute),
lastHandout: metaCacheTestsetTimestamp.Add(-20 * time.Minute),
startedCycle: 10,
endedCycle: 10,
dataVersion: metacacheStreamVersion,
@ -152,6 +152,22 @@ var metaCacheTestset = []metacache{
endedCycle: 0,
dataVersion: metacacheStreamVersion,
},
8: {
id: "case-8-finished-a-week-ago",
bucket: "bucket",
root: "folder/finished",
recursive: false,
status: scanStateSuccess,
fileNotFound: false,
error: "",
started: metaCacheTestsetTimestamp.Add(-7 * 24 * time.Hour),
ended: metaCacheTestsetTimestamp.Add(-7 * 24 * time.Hour),
lastUpdate: metaCacheTestsetTimestamp.Add(-7 * 24 * time.Hour),
lastHandout: metaCacheTestsetTimestamp.Add(-7 * 24 * time.Hour),
startedCycle: 10,
endedCycle: 10,
dataVersion: metacacheStreamVersion,
},
}
func Test_baseDirFromPrefix(t *testing.T) {
@ -222,7 +238,7 @@ func Test_metacache_canBeReplacedBy(t *testing.T) {
endedCycle: 10,
dataVersion: metacacheStreamVersion,
}
wantResults := []bool{0: true, 1: true, 2: true, 3: true, 4: true, 5: false, 6: true, 7: false}
wantResults := []bool{0: true, 1: true, 2: true, 3: true, 4: true, 5: false, 6: true, 7: false, 8: false}
for i, tt := range metaCacheTestset {
t.Run(tt.id, func(t *testing.T) {
@ -234,7 +250,8 @@ func Test_metacache_canBeReplacedBy(t *testing.T) {
}
// Add an hour, otherwise it will never be replaced.
// We operated on a copy.
tt.lastHandout.Add(-2 * time.Hour)
tt.lastHandout = tt.lastHandout.Add(-2 * time.Hour)
tt.lastUpdate = tt.lastHandout.Add(-2 * time.Hour)
got := tt.canBeReplacedBy(&testAgainst)
if got != want {
t.Errorf("#%d: want %v, got %v", i, want, got)
@ -244,7 +261,7 @@ func Test_metacache_canBeReplacedBy(t *testing.T) {
}
func Test_metacache_finished(t *testing.T) {
wantResults := []bool{0: true, 1: true, 2: true, 3: true, 4: false, 5: true, 6: true, 7: false}
wantResults := []bool{0: true, 1: true, 2: true, 3: true, 4: false, 5: true, 6: true, 7: false, 8: true}
for i, tt := range metaCacheTestset {
t.Run(tt.id, func(t *testing.T) {
@ -264,7 +281,7 @@ func Test_metacache_finished(t *testing.T) {
}
func Test_metacache_worthKeeping(t *testing.T) {
wantResults := []bool{0: true, 1: true, 2: true, 3: false, 4: false, 5: true, 6: false, 7: false}
wantResults := []bool{0: true, 1: true, 2: true, 3: false, 4: false, 5: true, 6: false, 7: false, 8: false}
for i, tt := range metaCacheTestset {
t.Run(tt.id, func(t *testing.T) {

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