mirror of
https://github.com/minio/minio
synced 2024-09-06 08:44:03 +00:00
![Harshavardhana](/assets/img/avatar_default.png)
- remove some duplicated code - reported a bug, separately fixed in #13664 - using strings.ReplaceAll() when needed - using filepath.ToSlash() use when needed - remove all non-Go style comments from the codebase Co-authored-by: Aditya Manthramurthy <donatello@users.noreply.github.com>
217 lines
8.7 KiB
Go
217 lines
8.7 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package cmd
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"os"
|
|
"reflect"
|
|
"sync"
|
|
|
|
"github.com/cespare/xxhash/v2"
|
|
"github.com/klauspost/reedsolomon"
|
|
"github.com/minio/minio/internal/logger"
|
|
)
|
|
|
|
// Erasure - erasure encoding details.
|
|
type Erasure struct {
|
|
encoder func() reedsolomon.Encoder
|
|
dataBlocks, parityBlocks int
|
|
blockSize int64
|
|
}
|
|
|
|
// NewErasure creates a new ErasureStorage.
|
|
func NewErasure(ctx context.Context, dataBlocks, parityBlocks int, blockSize int64) (e Erasure, err error) {
|
|
// Check the parameters for sanity now.
|
|
if dataBlocks <= 0 || parityBlocks <= 0 {
|
|
return e, reedsolomon.ErrInvShardNum
|
|
}
|
|
|
|
if dataBlocks+parityBlocks > 256 {
|
|
return e, reedsolomon.ErrMaxShardNum
|
|
}
|
|
|
|
e = Erasure{
|
|
dataBlocks: dataBlocks,
|
|
parityBlocks: parityBlocks,
|
|
blockSize: blockSize,
|
|
}
|
|
|
|
// Encoder when needed.
|
|
var enc reedsolomon.Encoder
|
|
var once sync.Once
|
|
e.encoder = func() reedsolomon.Encoder {
|
|
once.Do(func() {
|
|
e, err := reedsolomon.New(dataBlocks, parityBlocks, reedsolomon.WithAutoGoroutines(int(e.ShardSize())))
|
|
if err != nil {
|
|
// Error conditions should be checked above.
|
|
panic(err)
|
|
}
|
|
enc = e
|
|
})
|
|
return enc
|
|
}
|
|
return
|
|
}
|
|
|
|
// EncodeData encodes the given data and returns the erasure-coded data.
|
|
// It returns an error if the erasure coding failed.
|
|
func (e *Erasure) EncodeData(ctx context.Context, data []byte) ([][]byte, error) {
|
|
if len(data) == 0 {
|
|
return make([][]byte, e.dataBlocks+e.parityBlocks), nil
|
|
}
|
|
encoded, err := e.encoder().Split(data)
|
|
if err != nil {
|
|
logger.LogIf(ctx, err)
|
|
return nil, err
|
|
}
|
|
if err = e.encoder().Encode(encoded); err != nil {
|
|
logger.LogIf(ctx, err)
|
|
return nil, err
|
|
}
|
|
return encoded, nil
|
|
}
|
|
|
|
// DecodeDataBlocks decodes the given erasure-coded data.
|
|
// It only decodes the data blocks but does not verify them.
|
|
// It returns an error if the decoding failed.
|
|
func (e *Erasure) DecodeDataBlocks(data [][]byte) error {
|
|
var isZero = 0
|
|
for _, b := range data {
|
|
if len(b) == 0 {
|
|
isZero++
|
|
break
|
|
}
|
|
}
|
|
if isZero == 0 || isZero == len(data) {
|
|
// If all are zero, payload is 0 bytes.
|
|
return nil
|
|
}
|
|
return e.encoder().ReconstructData(data)
|
|
}
|
|
|
|
// DecodeDataAndParityBlocks decodes the given erasure-coded data and verifies it.
|
|
// It returns an error if the decoding failed.
|
|
func (e *Erasure) DecodeDataAndParityBlocks(ctx context.Context, data [][]byte) error {
|
|
if err := e.encoder().Reconstruct(data); err != nil {
|
|
logger.LogIf(ctx, err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ShardSize - returns actual shared size from erasure blockSize.
|
|
func (e *Erasure) ShardSize() int64 {
|
|
return ceilFrac(e.blockSize, int64(e.dataBlocks))
|
|
}
|
|
|
|
// ShardFileSize - returns final erasure size from original size.
|
|
func (e *Erasure) ShardFileSize(totalLength int64) int64 {
|
|
if totalLength == 0 {
|
|
return 0
|
|
}
|
|
if totalLength == -1 {
|
|
return -1
|
|
}
|
|
numShards := totalLength / e.blockSize
|
|
lastBlockSize := totalLength % e.blockSize
|
|
lastShardSize := ceilFrac(lastBlockSize, int64(e.dataBlocks))
|
|
return numShards*e.ShardSize() + lastShardSize
|
|
}
|
|
|
|
// ShardFileOffset - returns the effective offset where erasure reading begins.
|
|
func (e *Erasure) ShardFileOffset(startOffset, length, totalLength int64) int64 {
|
|
shardSize := e.ShardSize()
|
|
shardFileSize := e.ShardFileSize(totalLength)
|
|
endShard := (startOffset + length) / e.blockSize
|
|
tillOffset := endShard*shardSize + shardSize
|
|
if tillOffset > shardFileSize {
|
|
tillOffset = shardFileSize
|
|
}
|
|
return tillOffset
|
|
}
|
|
|
|
// erasureSelfTest performs a self-test to ensure that erasure
|
|
// algorithms compute expected erasure codes. If any algorithm
|
|
// produces an incorrect value it fails with a hard error.
|
|
//
|
|
// erasureSelfTest tries to catch any issue in the erasure implementation
|
|
// early instead of silently corrupting data.
|
|
func erasureSelfTest() {
|
|
// Approx runtime ~1ms
|
|
var testConfigs [][2]uint8
|
|
for total := uint8(4); total < 16; total++ {
|
|
for data := total / 2; data < total; data++ {
|
|
parity := total - data
|
|
testConfigs = append(testConfigs, [2]uint8{data, parity})
|
|
}
|
|
}
|
|
got := make(map[[2]uint8]map[ErasureAlgo]uint64, len(testConfigs))
|
|
// Copied from output of fmt.Printf("%#v", got) at the end.
|
|
want := map[[2]uint8]map[ErasureAlgo]uint64{{0x2, 0x2}: {0x1: 0x23fb21be2496f5d3}, {0x2, 0x3}: {0x1: 0xa5cd5600ba0d8e7c}, {0x3, 0x1}: {0x1: 0x60ab052148b010b4}, {0x3, 0x2}: {0x1: 0xe64927daef76435a}, {0x3, 0x3}: {0x1: 0x672f6f242b227b21}, {0x3, 0x4}: {0x1: 0x571e41ba23a6dc6}, {0x4, 0x1}: {0x1: 0x524eaa814d5d86e2}, {0x4, 0x2}: {0x1: 0x62b9552945504fef}, {0x4, 0x3}: {0x1: 0xcbf9065ee053e518}, {0x4, 0x4}: {0x1: 0x9a07581dcd03da8}, {0x4, 0x5}: {0x1: 0xbf2d27b55370113f}, {0x5, 0x1}: {0x1: 0xf71031a01d70daf}, {0x5, 0x2}: {0x1: 0x8e5845859939d0f4}, {0x5, 0x3}: {0x1: 0x7ad9161acbb4c325}, {0x5, 0x4}: {0x1: 0xc446b88830b4f800}, {0x5, 0x5}: {0x1: 0xabf1573cc6f76165}, {0x5, 0x6}: {0x1: 0x7b5598a85045bfb8}, {0x6, 0x1}: {0x1: 0xe2fc1e677cc7d872}, {0x6, 0x2}: {0x1: 0x7ed133de5ca6a58e}, {0x6, 0x3}: {0x1: 0x39ef92d0a74cc3c0}, {0x6, 0x4}: {0x1: 0xcfc90052bc25d20}, {0x6, 0x5}: {0x1: 0x71c96f6baeef9c58}, {0x6, 0x6}: {0x1: 0x4b79056484883e4c}, {0x6, 0x7}: {0x1: 0xb1a0e2427ac2dc1a}, {0x7, 0x1}: {0x1: 0x937ba2b7af467a22}, {0x7, 0x2}: {0x1: 0x5fd13a734d27d37a}, {0x7, 0x3}: {0x1: 0x3be2722d9b66912f}, {0x7, 0x4}: {0x1: 0x14c628e59011be3d}, {0x7, 0x5}: {0x1: 0xcc3b39ad4c083b9f}, {0x7, 0x6}: {0x1: 0x45af361b7de7a4ff}, {0x7, 0x7}: {0x1: 0x456cc320cec8a6e6}, {0x7, 0x8}: {0x1: 0x1867a9f4db315b5c}, {0x8, 0x1}: {0x1: 0xbc5756b9a9ade030}, {0x8, 0x2}: {0x1: 0xdfd7d9d0b3e36503}, {0x8, 0x3}: {0x1: 0x72bb72c2cdbcf99d}, {0x8, 0x4}: {0x1: 0x3ba5e9b41bf07f0}, {0x8, 0x5}: {0x1: 0xd7dabc15800f9d41}, {0x8, 0x6}: {0x1: 0xb482a6169fd270f}, {0x8, 0x7}: {0x1: 0x50748e0099d657e8}, {0x9, 0x1}: {0x1: 0xc77ae0144fcaeb6e}, {0x9, 0x2}: {0x1: 0x8a86c7dbebf27b68}, {0x9, 0x3}: {0x1: 0xa64e3be6d6fe7e92}, {0x9, 0x4}: {0x1: 0x239b71c41745d207}, {0x9, 0x5}: {0x1: 0x2d0803094c5a86ce}, {0x9, 0x6}: {0x1: 0xa3c2539b3af84874}, {0xa, 0x1}: {0x1: 0x7d30d91b89fcec21}, {0xa, 0x2}: {0x1: 0xfa5af9aa9f1857a3}, {0xa, 0x3}: {0x1: 0x84bc4bda8af81f90}, {0xa, 0x4}: {0x1: 0x6c1cba8631de994a}, {0xa, 0x5}: {0x1: 0x4383e58a086cc1ac}, {0xb, 0x1}: {0x1: 0x4ed2929a2df690b}, {0xb, 0x2}: {0x1: 0xecd6f1b1399775c0}, {0xb, 0x3}: {0x1: 0xc78cfbfc0dc64d01}, {0xb, 0x4}: {0x1: 0xb2643390973702d6}, {0xc, 0x1}: {0x1: 0x3b2a88686122d082}, {0xc, 0x2}: {0x1: 0xfd2f30a48a8e2e9}, {0xc, 0x3}: {0x1: 0xd5ce58368ae90b13}, {0xd, 0x1}: {0x1: 0x9c88e2a9d1b8fff8}, {0xd, 0x2}: {0x1: 0xcb8460aa4cf6613}, {0xe, 0x1}: {0x1: 0x78a28bbaec57996e}}
|
|
var testData [256]byte
|
|
for i := range testData {
|
|
testData[i] = byte(i)
|
|
}
|
|
ok := true
|
|
for algo := invalidErasureAlgo + 1; algo < lastErasureAlgo; algo++ {
|
|
for _, conf := range testConfigs {
|
|
failOnErr := func(err error) {
|
|
if err != nil {
|
|
logger.Fatal(errSelfTestFailure, "%v: error on self-test [d:%d,p:%d]: %v. Unsafe to start server.\n", algo, conf[0], conf[1], err)
|
|
}
|
|
}
|
|
e, err := NewErasure(context.Background(), int(conf[0]), int(conf[1]), blockSizeV2)
|
|
failOnErr(err)
|
|
encoded, err := e.EncodeData(GlobalContext, testData[:])
|
|
failOnErr(err)
|
|
hash := xxhash.New()
|
|
for i, data := range encoded {
|
|
// Write index to keep track of sizes of each.
|
|
_, err = hash.Write([]byte{byte(i)})
|
|
failOnErr(err)
|
|
_, err = hash.Write(data)
|
|
failOnErr(err)
|
|
got[conf] = map[ErasureAlgo]uint64{algo: hash.Sum64()}
|
|
}
|
|
|
|
if a, b := want[conf], got[conf]; !reflect.DeepEqual(a, b) {
|
|
fmt.Fprintf(os.Stderr, "%v: error on self-test [d:%d,p:%d]: want %#v, got %#v\n", algo, conf[0], conf[1], a, b)
|
|
ok = false
|
|
continue
|
|
}
|
|
// Delete first shard and reconstruct...
|
|
first := encoded[0]
|
|
encoded[0] = nil
|
|
failOnErr(e.DecodeDataBlocks(encoded))
|
|
if a, b := first, encoded[0]; !bytes.Equal(a, b) {
|
|
fmt.Fprintf(os.Stderr, "%v: error on self-test [d:%d,p:%d]: want %#v, got %#v\n", algo, conf[0], conf[1], hex.EncodeToString(a), hex.EncodeToString(b))
|
|
ok = false
|
|
continue
|
|
}
|
|
|
|
}
|
|
}
|
|
if !ok {
|
|
logger.Fatal(errSelfTestFailure, "Erasure Coding self test failed")
|
|
}
|
|
}
|