LBRYCommunity/reflector.go
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LFUDA changes #47

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nikooo777 wants to merge 12 commits from improvements into master
pull from: improvements
merge into: LBRYCommunity:master
Conversation 2 Commits 12 Files changed 17 +20 -16
3 changed files with 20 additions and 16 deletions
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Showing only changes of commit bb41a84bb7 - Show all commits

8
cmd/reflector.go
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@ -159,9 +159,10 @@ func wrapWithCache(s store.BlobStore) store.BlobStore {
wrapped = store.NewCachingStore(
"reflector",
wrapped,
store.NewLRUStore("peer_server", store.NewDiskStore(diskCachePath, 2), diskCacheMaxSize),
store.NewLRUStore("hdd", store.NewDiskStore(diskCachePath, 2), diskCacheMaxSize),
)
}
diskCacheMaxSize, diskCachePath = diskCacheParams(bufferReflectorCmdDiskCache)
if diskCacheMaxSize > 0 {
err := os.MkdirAll(diskCachePath, os.ModePerm)
@ -171,14 +172,15 @@ func wrapWithCache(s store.BlobStore) store.BlobStore {
wrapped = store.NewCachingStore(
"reflector",
wrapped,
store.NewLRUStore("peer_server", store.NewDiskStore(diskCachePath, 2), diskCacheMaxSize),
store.NewLRUStore("nvme", store.NewDiskStore(diskCachePath, 2), diskCacheMaxSize),
)
}
if reflectorCmdMemCache > 0 {
wrapped = store.NewCachingStore(
"reflector",
wrapped,
store.NewLRUStore("peer_server", store.NewMemStore(), reflectorCmdMemCache),
store.NewLRUStore("mem", store.NewMemStore(), reflectorCmdMemCache),
)
}

18
store/lru.go
View file

@ -18,18 +18,20 @@ type LRUStore struct {
// NewLRUStore initialize a new LRUStore
func NewLRUStore(component string, store BlobStore, maxItems int) *LRUStore {
l := &LRUStore{
store: store,
}
lru, err := golru.NewWithEvict(maxItems, func(key interface{}, value interface{}) {
metrics.CacheLRUEvictCount.With(metrics.CacheLabels(store.Name(), component)).Inc()
metrics.CacheLRUEvictCount.With(metrics.CacheLabels(l.Name(), component)).Inc()
_ = store.Delete(key.(string)) // TODO: log this error. may happen if underlying entry is gone but cache entry still there
})
if err != nil {
panic(err)
}
l := &LRUStore{
store: store,
lru: lru,
}
l.lru = lru
go func() {
if lstr, ok := store.(lister); ok {
err = l.loadExisting(lstr, maxItems)
@ -42,10 +44,10 @@ func NewLRUStore(component string, store BlobStore, maxItems int) *LRUStore {
return l
}
const nameLRU = "lru"
// Name is the cache type name
func (l *LRUStore) Name() string { return nameLRU }
func (l *LRUStore) Name() string {
return "lru_" + l.store.Name()
}
// Has returns whether the blob is in the store, without updating the recent-ness.
lyoshenka commented 2020-11-27 22:35:00 +01:00 (Migrated from github.com)
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this should at least be an option, and ideally should have a way to notify that load finished.

also needs clean shutdown

this should at least be an option, and ideally should have a way to notify that load finished. also needs clean shutdown
nikooo777 commented 2020-12-09 19:21:17 +01:00 (Migrated from github.com)
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can I argue that a clean shutdown here doesn't matter? or is it just bad?

can I argue that a clean shutdown here doesn't matter? or is it just bad?
anbsky commented 2020-12-10 08:24:56 +01:00 (Migrated from github.com)
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If you have a big cache, start this and immediately press Ctrl+C, what will happen? My guess is it probably won't shut down and will annoyingly keep running in the foreground.

If you have a big cache, start this and immediately press `Ctrl+C`, what will happen? My guess is it probably won't shut down and will annoyingly keep running in the foreground.
lyoshenka commented 2020-12-10 15:59:29 +01:00 (Migrated from github.com)
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YES! this was in the back of my mind but i forgot about it. i think there's even a TODO in the code. thanks for catching it

YES! this was in the back of my mind but i forgot about it. i think there's even a TODO in the code. thanks for catching it
nikooo777 commented 2020-12-22 21:10:14 +01:00 (Migrated from github.com)
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@andybeletsky IIRC as long as the main thread returns, all routines are automatically killed in GO. I'll have to test that but I think a ctrl+c would kill it right away

@andybeletsky IIRC as long as the main thread returns, all routines are automatically killed in GO. I'll have to test that but I think a ctrl+c would kill it right away
func (l *LRUStore) Has(hash string) (bool, error) {

10
store/singleflight.go
View file

@ -32,8 +32,8 @@ func (s *singleflightStore) Name() string {
// Get ensures that only one request per hash is sent to the origin at a time,
// thereby protecting against https://en.wikipedia.org/wiki/Thundering_herd_problem
func (s *singleflightStore) Get(hash string) (stream.Blob, error) {
metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Inc()
defer metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Dec()
metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
defer metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
blob, err, _ := s.sf.Do(hash, s.getter(hash))
if err != nil {
@ -46,8 +46,8 @@ func (s *singleflightStore) Get(hash string) (stream.Blob, error) {
// only one getter per hash will be executing at a time
func (s *singleflightStore) getter(hash string) func() (interface{}, error) {
return func() (interface{}, error) {
metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Inc()
defer metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Dec()
metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
defer metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
start := time.Now()
blob, err := s.BlobStore.Get(hash)
@ -57,7 +57,7 @@ func (s *singleflightStore) getter(hash string) func() (interface{}, error) {
rate := float64(len(blob)) / 1024 / 1024 / time.Since(start).Seconds()
metrics.CacheRetrievalSpeed.With(map[string]string{
metrics.LabelCacheType: s.BlobStore.Name(),
metrics.LabelCacheType: s.Name(),
metrics.LabelComponent: s.component,
metrics.LabelSource: "origin",
}).Set(rate)