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Remove globalMaxCacheSize and globalCacheExpiry variables (#3826)

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This patch fixes below

* Remove global variables globalMaxCacheSize and globalCacheExpiry.
* Make global variables into constant in objcache package.
This commit is contained in:
Bala FA 2017-03-03 00:04:37 +05:30 committed by Harshavardhana
parent a179fc9658
commit 208dd15245
8 changed files with 127 additions and 83 deletions
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8
cmd/globals.go
View File

@ -26,7 +26,6 @@ import (
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/objcache"
)
// minio configuration related constants.
@ -78,16 +77,9 @@ var (
// Set to true if credentials were passed from env, default is false.
globalIsEnvCreds = false
// Maximum cache size. Defaults to disabled.
// Caching is enabled only for RAM size > 8GiB.
globalMaxCacheSize = uint64(0)
// Maximum size of internal objects parts
globalPutPartSize = int64(64 * 1024 * 1024)
// Cache expiry.
globalCacheExpiry = objcache.DefaultExpiry
// Minio local server address (in `host:port` format)
globalMinioAddr = ""
// Minio default port, can be changed through command line.

12
cmd/server-main.go
View File

@ -138,16 +138,8 @@ func initServerConfig(c *cli.Context) {
// Load user supplied root CAs
loadRootCAs()
// Set maxOpenFiles, This is necessary since default operating
// system limits of 1024, 2048 are not enough for Minio server.
setMaxOpenFiles()
// Set maxMemory, This is necessary since default operating
// system limits might be changed and we need to make sure we
// do not crash the server so the set the maxCacheSize appropriately.
setMaxMemory()
// Do not fail if this is not allowed, lower limits are fine as well.
// Set system resources to maximum.
errorIf(setMaxResources(), "Unable to change resource limit")
}
// Validate if input disks are sufficient for initializing XL.

52
cmd/server-rlimit.go
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@ -16,17 +16,27 @@
package cmd
import (
"github.com/minio/minio/pkg/sys"
)
import "github.com/minio/minio/pkg/sys"
func setMaxOpenFiles() error {
_, maxLimit, err := sys.GetMaxOpenFileLimit()
if err != nil {
func setMaxResources() (err error) {
var maxLimit uint64
// Set open files limit to maximum.
if _, maxLimit, err = sys.GetMaxOpenFileLimit(); err != nil {
return err
}
return sys.SetMaxOpenFileLimit(maxLimit, maxLimit)
if err = sys.SetMaxOpenFileLimit(maxLimit, maxLimit); err != nil {
return err
}
// Set max memory limit as current memory limit.
if _, maxLimit, err = sys.GetMaxMemoryLimit(); err != nil {
return err
}
err = sys.SetMaxMemoryLimit(maxLimit, maxLimit)
return err
}
func getMaxCacheSize(curLimit, totalRAM uint64) (cacheSize uint64) {
@ -45,29 +55,25 @@ func getMaxCacheSize(curLimit, totalRAM uint64) (cacheSize uint64) {
return cacheSize
}
func setMaxMemory() error {
// GetMaxCacheSize returns maximum cache size based on current RAM size and memory limit.
func GetMaxCacheSize() (cacheSize uint64, err error) {
// Get max memory limit
_, maxLimit, err := sys.GetMaxMemoryLimit()
if err != nil {
return err
}
// Set max memory limit as current memory limit.
if err = sys.SetMaxMemoryLimit(maxLimit, maxLimit); err != nil {
return err
var curLimit uint64
if curLimit, _, err = sys.GetMaxMemoryLimit(); err != nil {
return cacheSize, err
}
// Get total RAM.
stats, err := sys.GetStats()
if err != nil {
return err
var stats sys.Stats
if stats, err = sys.GetStats(); err != nil {
return cacheSize, err
}
// In some OS like windows, maxLimit is zero. Set total RAM as maxLimit.
if maxLimit == 0 {
maxLimit = stats.TotalRAM
if curLimit == 0 {
curLimit = stats.TotalRAM
}
globalMaxCacheSize = getMaxCacheSize(maxLimit, stats.TotalRAM)
return nil
cacheSize = getMaxCacheSize(curLimit, stats.TotalRAM)
return cacheSize, err
}

4
cmd/test-utils_test.go
View File

@ -65,8 +65,8 @@ func init() {
// Disable printing console messages during tests.
color.Output = ioutil.Discard
// Enable caching.
setMaxMemory()
// Set system resources to maximum.
setMaxResources()
}
func prepareFS() (ObjectLayer, string, error) {

17
cmd/xl-v1.go
View File

@ -127,14 +127,23 @@ func newXLObjects(storageDisks []StorageAPI) (ObjectLayer, error) {
listPool: listPool,
}
// Object cache is enabled when _MINIO_CACHE env is missing.
// and cache size is > 0.
xl.objCacheEnabled = !objCacheDisabled && globalMaxCacheSize > 0
// Get cache size if _MINIO_CACHE environment variable is set.
var maxCacheSize uint64
if !objCacheDisabled {
maxCacheSize, err = GetMaxCacheSize()
errorIf(err, "Unable to get maximum cache size")
// Enable object cache if cache size is more than zero
xl.objCacheEnabled = maxCacheSize > 0
}
// Check if object cache is enabled.
if xl.objCacheEnabled {
// Initialize object cache.
objCache := objcache.New(globalMaxCacheSize, globalCacheExpiry)
objCache, err := objcache.New(maxCacheSize, objcache.DefaultExpiry)
if err != nil {
return nil, err
}
objCache.OnEviction = func(key string) {
debug.FreeOSMemory()
}

18
pkg/objcache/README.md
View File

@ -6,22 +6,24 @@ package objcache
Package objcache implements in memory caching methods.
CONSTANTS
const (
// NoExpiry represents caches to be permanent and can only be deleted.
NoExpiry = time.Duration(0)
// DefaultExpiry represents three days time duration when individual entries will be expired.
DefaultExpiry = time.Duration(3 * 24 * time.Hour)
)
VARIABLES
var DefaultExpiry = time.Duration(72 * time.Hour) // 72hrs.
DefaultExpiry represents default time duration value when individual
entries will be expired.
var ErrCacheFull = errors.New("Not enough space in cache")
ErrCacheFull - cache is full.
var ErrKeyNotFoundInCache = errors.New("Key not found in cache")
ErrKeyNotFoundInCache - key not found in cache.
var NoExpiry = time.Duration(0)
NoExpiry represents caches to be permanent and can only be deleted.
TYPES
type Cache struct {

37
pkg/objcache/objcache.go
View File

@ -1,5 +1,5 @@
/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
* Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -27,18 +27,20 @@ import (
"time"
)
// NoExpiry represents caches to be permanent and can only be deleted.
var NoExpiry = time.Duration(0)
const (
// NoExpiry represents caches to be permanent and can only be deleted.
NoExpiry = time.Duration(0)
// DefaultExpiry represents default time duration value when individual entries will be expired.
var DefaultExpiry = time.Duration(72 * time.Hour) // 72hrs.
// DefaultExpiry represents three days time duration when individual entries will be expired.
DefaultExpiry = time.Duration(3 * 24 * time.Hour)
// DefaultBufferRatio represents default ratio used to calculate the
// individual cache entry buffer size.
var DefaultBufferRatio = uint64(10)
// defaultBufferRatio represents default ratio used to calculate the
// individual cache entry buffer size.
defaultBufferRatio = uint64(10)
// DefaultGCPercent represents default garbage collection target percentage.
var DefaultGCPercent = 20
// defaultGCPercent represents default garbage collection target percentage.
defaultGCPercent = 20
)
// buffer represents the in memory cache of a single entry.
// buffer carries value of the data and last accessed time.
@ -87,9 +89,10 @@ type Cache struct {
// duration. If the expiry duration is less than one
// (or NoExpiry), the items in the cache never expire
// (by default), and must be deleted manually.
func New(maxSize uint64, expiry time.Duration) *Cache {
func New(maxSize uint64, expiry time.Duration) (c *Cache, err error) {
if maxSize == 0 {
panic("objcache: setting maximum cache size to zero is forbidden.")
err = errors.New("invalid maximum cache size")
return c, err
}
// A garbage collection is triggered when the ratio
@ -106,20 +109,20 @@ func New(maxSize uint64, expiry time.Duration) *Cache {
// when we get to 8M.
//
// Set this value to 20% if caching is enabled.
debug.SetGCPercent(DefaultGCPercent)
debug.SetGCPercent(defaultGCPercent)
// Max cache entry size - indicates the
// maximum buffer per key that can be held in
// memory. Currently this value is 1/10th
// the size of requested cache size.
maxCacheEntrySize := func() uint64 {
i := maxSize / DefaultBufferRatio
i := maxSize / defaultBufferRatio
if i == 0 {
i = maxSize
}
return i
}()
c := &Cache{
c = &Cache{
onceGC: sync.Once{},
maxSize: maxSize,
maxCacheEntrySize: maxCacheEntrySize,
@ -134,7 +137,7 @@ func New(maxSize uint64, expiry time.Duration) *Cache {
// Start garbage collection routine to expire objects.
c.StartGC()
}
return c
return c, nil
}
// ErrKeyNotFoundInCache - key not found in cache.
@ -177,7 +180,7 @@ func (c *Cache) Create(key string, size int64) (w io.WriteCloser, err error) {
// Change GC percent if the current cache usage
// is already 75% of the maximum allowed usage.
if c.currentSize > (75 * c.maxSize / 100) {
c.onceGC.Do(func() { debug.SetGCPercent(DefaultGCPercent - 10) })
c.onceGC.Do(func() { debug.SetGCPercent(defaultGCPercent - 10) })
}
c.mutex.Unlock()

62
pkg/objcache/objcache_test.go
View File

@ -43,7 +43,11 @@ func TestObjExpiry(t *testing.T) {
// Test case 1 validates running of GC.
testCase := testCases[0]
cache := New(testCase.cacheSize, testCase.expiry)
cache, err := New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
cache.OnEviction = func(key string) {}
w, err := cache.Create("test", 1)
if err != nil {
@ -126,15 +130,23 @@ func TestObjCache(t *testing.T) {
// Test 1 validating Open failure.
testCase := testCases[0]
cache := New(testCase.cacheSize, testCase.expiry)
_, err := cache.Open("test", fakeObjModTime)
cache, err := New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
_, err = cache.Open("test", fakeObjModTime)
if testCase.err != err {
t.Errorf("Test case 2 expected to pass, failed instead %s", err)
}
// Test 2 validating Create failure.
testCase = testCases[1]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
_, err = cache.Create("test", 2)
if testCase.err != err {
t.Errorf("Test case 2 expected to pass, failed instead %s", err)
@ -144,7 +156,11 @@ func TestObjCache(t *testing.T) {
// Subsequently we Close() without writing any data, to receive
// `io.ErrShortBuffer`
testCase = testCases[2]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err := cache.Create("test", 1)
if testCase.err != err {
t.Errorf("Test case 3 expected to pass, failed instead %s", err)
@ -156,7 +172,11 @@ func TestObjCache(t *testing.T) {
// Test 4 validates Create and Close succeeds successfully caching
// the writes.
testCase = testCases[3]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err = cache.Create("test", 5)
if testCase.err != err {
t.Errorf("Test case 4 expected to pass, failed instead %s", err)
@ -184,7 +204,11 @@ func TestObjCache(t *testing.T) {
// Test 5 validates Delete succeeds and Open fails with err
testCase = testCases[4]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err = cache.Create("test", 5)
if err != nil {
t.Errorf("Test case 5 expected to pass, failed instead %s", err)
@ -204,7 +228,11 @@ func TestObjCache(t *testing.T) {
// Test 6 validates OnEviction being called upon Delete is being invoked.
testCase = testCases[5]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err = cache.Create("test", 5)
if err != nil {
t.Errorf("Test case 6 expected to pass, failed instead %s", err)
@ -227,7 +255,11 @@ func TestObjCache(t *testing.T) {
// Test 7 validates rejecting requests when excess data is being saved.
testCase = testCases[6]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err = cache.Create("test1", 5)
if err != nil {
t.Errorf("Test case 7 expected to pass, failed instead %s", err)
@ -245,7 +277,11 @@ func TestObjCache(t *testing.T) {
// Test 8 validates rejecting Writes which write excess data.
testCase = testCases[7]
cache = New(testCase.cacheSize, testCase.expiry)
cache, err = New(testCase.cacheSize, testCase.expiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err = cache.Create("test1", 5)
if err != nil {
t.Errorf("Test case 8 expected to pass, failed instead %s", err)
@ -267,7 +303,11 @@ func TestObjCache(t *testing.T) {
// TestStateEntryPurge - tests if objCache purges stale entry and returns ErrKeyNotFoundInCache.
func TestStaleEntryPurge(t *testing.T) {
cache := New(1024, NoExpiry)
cache, err := New(1024, NoExpiry)
if err != nil {
t.Fatalf("Unable to create new objcache")
}
w, err := cache.Create("test", 5)
if err != nil {
t.Errorf("Test case expected to pass, failed instead %s", err)