minio/cmd/endpoint-ellipses.go
Harshavardhana e9b2bf00ad Support MinIO to be deployed on more than 32 nodes (#8492)
This PR implements locking from a global entity into
a more localized set level entity, allowing for locks
to be held only on the resources which are writing
to a collection of disks rather than a global level.

In this process this PR also removes the top-level
limit of 32 nodes to an unlimited number of nodes. This
is a precursor change before bring in bucket expansion.
2019-11-13 12:17:45 -08:00

279 lines
7.9 KiB
Go

/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"fmt"
"strconv"
"strings"
"github.com/minio/minio-go/v6/pkg/set"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/pkg/ellipses"
"github.com/minio/minio/pkg/env"
)
// This file implements and supports ellipses pattern for
// `minio server` command line arguments.
// Endpoint set represents parsed ellipses values, also provides
// methods to get the sets of endpoints.
type endpointSet struct {
argPatterns []ellipses.ArgPattern
endpoints []string // Endpoints saved from previous GetEndpoints().
setIndexes [][]uint64 // All the sets.
}
// Supported set sizes this is used to find the optimal
// single set size.
var setSizes = []uint64{4, 6, 8, 10, 12, 14, 16}
// getDivisibleSize - returns a greatest common divisor of
// all the ellipses sizes.
func getDivisibleSize(totalSizes []uint64) (result uint64) {
gcd := func(x, y uint64) uint64 {
for y != 0 {
x, y = y, x%y
}
return x
}
result = totalSizes[0]
for i := 1; i < len(totalSizes); i++ {
result = gcd(result, totalSizes[i])
}
return result
}
// getSetIndexes returns list of indexes which provides the set size
// on each index, this function also determines the final set size
// The final set size has the affinity towards choosing smaller
// indexes (total sets)
func getSetIndexes(args []string, totalSizes []uint64) (setIndexes [][]uint64, err error) {
if len(totalSizes) == 0 || len(args) == 0 {
return nil, errInvalidArgument
}
// isValidSetSize - checks whether given count is a valid set size for erasure coding.
isValidSetSize := func(count uint64) bool {
return (count >= setSizes[0] && count <= setSizes[len(setSizes)-1] && count%2 == 0)
}
var customSetDriveCount uint64
if v := env.Get("MINIO_ERASURE_SET_DRIVE_COUNT", ""); v != "" {
customSetDriveCount, err = strconv.ParseUint(v, 10, 64)
if err != nil {
return nil, config.ErrInvalidErasureSetSize(err)
}
if !isValidSetSize(customSetDriveCount) {
return nil, config.ErrInvalidErasureSetSize(nil)
}
}
setIndexes = make([][]uint64, len(totalSizes))
for _, totalSize := range totalSizes {
// Check if totalSize has minimum range upto setSize
if totalSize < setSizes[0] || totalSize < customSetDriveCount {
return nil, config.ErrInvalidNumberOfErasureEndpoints(nil)
}
}
var setSize uint64
commonSize := getDivisibleSize(totalSizes)
if commonSize > setSizes[len(setSizes)-1] {
prevD := commonSize / setSizes[0]
for _, i := range setSizes {
if commonSize%i == 0 {
d := commonSize / i
if d <= prevD {
prevD = d
setSize = i
}
}
}
} else {
setSize = commonSize
}
possibleSetCounts := func(setSize uint64) (ss []uint64) {
for _, s := range setSizes {
if setSize%s == 0 {
ss = append(ss, s)
}
}
return ss
}
if customSetDriveCount > 0 {
msg := fmt.Sprintf("Invalid set drive count, leads to non-uniform distribution for the given number of disks. Possible values for custom set count are %d", possibleSetCounts(setSize))
if customSetDriveCount > setSize {
return nil, config.ErrInvalidErasureSetSize(nil).Msg(msg)
}
if setSize%customSetDriveCount != 0 {
return nil, config.ErrInvalidErasureSetSize(nil).Msg(msg)
}
setSize = customSetDriveCount
}
// Check whether setSize is with the supported range.
if !isValidSetSize(setSize) {
return nil, config.ErrInvalidNumberOfErasureEndpoints(nil)
}
for i := range totalSizes {
for j := uint64(0); j < totalSizes[i]/setSize; j++ {
setIndexes[i] = append(setIndexes[i], setSize)
}
}
return setIndexes, nil
}
// Returns all the expanded endpoints, each argument is expanded separately.
func (s endpointSet) getEndpoints() (endpoints []string) {
if len(s.endpoints) != 0 {
return s.endpoints
}
for _, argPattern := range s.argPatterns {
for _, lbls := range argPattern.Expand() {
endpoints = append(endpoints, strings.Join(lbls, ""))
}
}
s.endpoints = endpoints
return endpoints
}
// Get returns the sets representation of the endpoints
// this function also intelligently decides on what will
// be the right set size etc.
func (s endpointSet) Get() (sets [][]string) {
var k = uint64(0)
endpoints := s.getEndpoints()
for i := range s.setIndexes {
for j := range s.setIndexes[i] {
sets = append(sets, endpoints[k:s.setIndexes[i][j]+k])
k = s.setIndexes[i][j] + k
}
}
return sets
}
// Return the total size for each argument patterns.
func getTotalSizes(argPatterns []ellipses.ArgPattern) []uint64 {
var totalSizes []uint64
for _, argPattern := range argPatterns {
var totalSize uint64 = 1
for _, p := range argPattern {
totalSize = totalSize * uint64(len(p.Seq))
}
totalSizes = append(totalSizes, totalSize)
}
return totalSizes
}
// Parses all arguments and returns an endpointSet which is a collection
// of endpoints following the ellipses pattern, this is what is used
// by the object layer for initializing itself.
func parseEndpointSet(args ...string) (ep endpointSet, err error) {
var argPatterns = make([]ellipses.ArgPattern, len(args))
for i, arg := range args {
patterns, perr := ellipses.FindEllipsesPatterns(arg)
if perr != nil {
return endpointSet{}, config.ErrInvalidErasureEndpoints(nil).Msg(perr.Error())
}
argPatterns[i] = patterns
}
ep.setIndexes, err = getSetIndexes(args, getTotalSizes(argPatterns))
if err != nil {
return endpointSet{}, config.ErrInvalidErasureEndpoints(nil).Msg(err.Error())
}
ep.argPatterns = argPatterns
return ep, nil
}
// GetAllSets - parses all ellipses input arguments, expands them into
// corresponding list of endpoints chunked evenly in accordance with a
// specific set size.
// For example: {1...64} is divided into 4 sets each of size 16.
// This applies to even distributed setup syntax as well.
func GetAllSets(args ...string) ([][]string, error) {
if len(args) == 0 {
return nil, errInvalidArgument
}
var setArgs [][]string
if !ellipses.HasEllipses(args...) {
var setIndexes [][]uint64
// Check if we have more one args.
if len(args) > 1 {
var err error
setIndexes, err = getSetIndexes(args, []uint64{uint64(len(args))})
if err != nil {
return nil, err
}
} else {
// We are in FS setup, proceed forward.
setIndexes = [][]uint64{{uint64(len(args))}}
}
s := endpointSet{
endpoints: args,
setIndexes: setIndexes,
}
setArgs = s.Get()
} else {
s, err := parseEndpointSet(args...)
if err != nil {
return nil, err
}
setArgs = s.Get()
}
uniqueArgs := set.NewStringSet()
for _, sargs := range setArgs {
for _, arg := range sargs {
if uniqueArgs.Contains(arg) {
return nil, config.ErrInvalidErasureEndpoints(nil).Msg(fmt.Sprintf("Input args (%s) has duplicate ellipses", args))
}
uniqueArgs.Add(arg)
}
}
return setArgs, nil
}
// CreateServerEndpoints - validates and creates new endpoints from input args, supports
// both ellipses and without ellipses transparently.
func createServerEndpoints(serverAddr string, args ...string) (string, EndpointList, SetupType, int, int, error) {
setArgs, err := GetAllSets(args...)
if err != nil {
return serverAddr, nil, -1, 0, 0, err
}
var endpoints EndpointList
var setupType SetupType
serverAddr, endpoints, setupType, err = CreateEndpoints(serverAddr, setArgs...)
if err != nil {
return serverAddr, nil, -1, 0, 0, err
}
return serverAddr, endpoints, setupType, len(setArgs), len(setArgs[0]), nil
}