9b99e3dfe0
The Append / truncate operations were racy. When a datafile reaches 2Gb, a new file is needed. For this operation, we require a writelock, which is not needed in the 99.99% of all cases where the data does fit in the current head-file. This transition from readlock to writelock was incorrect, and as the readlock was released, a truncate operation could slip in between, and truncate the data. This would have been fine, however, the Append operation continued writing as if no truncation had occurred, e.g writing item 5 where item 0 should reside. This PR changes the behaviour, so that if when we run into the situation that a new file is needed, it aborts, and retries, this time with a writelock. The outcome of the situation described above, running on this PR, would instead be that the Append operation exits with a failure.
695 lines
18 KiB
Go
695 lines
18 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rawdb
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io/ioutil"
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"math/rand"
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"os"
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"path/filepath"
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"sync"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/metrics"
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)
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func init() {
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rand.Seed(time.Now().Unix())
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}
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// Gets a chunk of data, filled with 'b'
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func getChunk(size int, b int) []byte {
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data := make([]byte, size)
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for i := range data {
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data[i] = byte(b)
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}
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return data
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}
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// TestFreezerBasics test initializing a freezertable from scratch, writing to the table,
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// and reading it back.
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func TestFreezerBasics(t *testing.T) {
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t.Parallel()
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// set cutoff at 50 bytes
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f, err := newCustomTable(os.TempDir(),
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fmt.Sprintf("unittest-%d", rand.Uint64()),
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metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge(), 50, true)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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// Write 15 bytes 255 times, results in 85 files
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for x := 0; x < 255; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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//print(t, f, 0)
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//print(t, f, 1)
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//print(t, f, 2)
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//
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//db[0] = 000000000000000000000000000000
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//db[1] = 010101010101010101010101010101
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//db[2] = 020202020202020202020202020202
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for y := 0; y < 255; y++ {
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exp := getChunk(15, y)
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got, err := f.Retrieve(uint64(y))
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(got, exp) {
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t.Fatalf("test %d, got \n%x != \n%x", y, got, exp)
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}
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}
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// Check that we cannot read too far
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_, err = f.Retrieve(uint64(255))
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if err != errOutOfBounds {
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t.Fatal(err)
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}
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}
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// TestFreezerBasicsClosing tests same as TestFreezerBasics, but also closes and reopens the freezer between
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// every operation
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func TestFreezerBasicsClosing(t *testing.T) {
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t.Parallel()
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// set cutoff at 50 bytes
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var (
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fname = fmt.Sprintf("basics-close-%d", rand.Uint64())
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rm, wm, sg = metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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f *freezerTable
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err error
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)
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f, err = newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 255 times, results in 85 files
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for x := 0; x < 255; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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f.Close()
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f, err = newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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}
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defer f.Close()
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for y := 0; y < 255; y++ {
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exp := getChunk(15, y)
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got, err := f.Retrieve(uint64(y))
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(got, exp) {
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t.Fatalf("test %d, got \n%x != \n%x", y, got, exp)
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}
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f.Close()
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f, err = newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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}
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}
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// TestFreezerRepairDanglingHead tests that we can recover if index entries are removed
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func TestFreezerRepairDanglingHead(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("dangling_headtest-%d", rand.Uint64())
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{ // Fill table
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 255 times
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for x := 0; x < 255; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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// The last item should be there
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if _, err = f.Retrieve(0xfe); err != nil {
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t.Fatal(err)
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}
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f.Close()
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}
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// open the index
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idxFile, err := os.OpenFile(filepath.Join(os.TempDir(), fmt.Sprintf("%s.ridx", fname)), os.O_RDWR, 0644)
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if err != nil {
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t.Fatalf("Failed to open index file: %v", err)
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}
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// Remove 4 bytes
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stat, err := idxFile.Stat()
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if err != nil {
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t.Fatalf("Failed to stat index file: %v", err)
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}
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idxFile.Truncate(stat.Size() - 4)
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idxFile.Close()
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// Now open it again
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// The last item should be missing
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if _, err = f.Retrieve(0xff); err == nil {
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t.Errorf("Expected error for missing index entry")
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}
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// The one before should still be there
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if _, err = f.Retrieve(0xfd); err != nil {
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t.Fatalf("Expected no error, got %v", err)
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}
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}
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}
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// TestFreezerRepairDanglingHeadLarge tests that we can recover if very many index entries are removed
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func TestFreezerRepairDanglingHeadLarge(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("dangling_headtest-%d", rand.Uint64())
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{ // Fill a table and close it
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 255 times
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for x := 0; x < 0xff; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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// The last item should be there
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if _, err = f.Retrieve(f.items - 1); err != nil {
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t.Fatal(err)
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}
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f.Close()
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}
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// open the index
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idxFile, err := os.OpenFile(filepath.Join(os.TempDir(), fmt.Sprintf("%s.ridx", fname)), os.O_RDWR, 0644)
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if err != nil {
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t.Fatalf("Failed to open index file: %v", err)
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}
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// Remove everything but the first item, and leave data unaligned
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// 0-indexEntry, 1-indexEntry, corrupt-indexEntry
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idxFile.Truncate(indexEntrySize + indexEntrySize + indexEntrySize/2)
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idxFile.Close()
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// Now open it again
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// The first item should be there
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if _, err = f.Retrieve(0); err != nil {
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t.Fatal(err)
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}
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// The second item should be missing
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if _, err = f.Retrieve(1); err == nil {
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t.Errorf("Expected error for missing index entry")
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}
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// We should now be able to store items again, from item = 1
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for x := 1; x < 0xff; x++ {
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data := getChunk(15, ^x)
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f.Append(uint64(x), data)
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}
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f.Close()
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}
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// And if we open it, we should now be able to read all of them (new values)
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{
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f, _ := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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for y := 1; y < 255; y++ {
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exp := getChunk(15, ^y)
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got, err := f.Retrieve(uint64(y))
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(got, exp) {
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t.Fatalf("test %d, got \n%x != \n%x", y, got, exp)
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}
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}
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}
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}
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// TestSnappyDetection tests that we fail to open a snappy database and vice versa
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func TestSnappyDetection(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("snappytest-%d", rand.Uint64())
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// Open with snappy
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 255 times
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for x := 0; x < 0xff; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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f.Close()
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}
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// Open without snappy
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, false)
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if err != nil {
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t.Fatal(err)
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}
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if _, err = f.Retrieve(0); err == nil {
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f.Close()
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t.Fatalf("expected empty table")
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}
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}
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// Open with snappy
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// There should be 255 items
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if _, err = f.Retrieve(0xfe); err != nil {
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f.Close()
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t.Fatalf("expected no error, got %v", err)
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}
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}
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}
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func assertFileSize(f string, size int64) error {
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stat, err := os.Stat(f)
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if err != nil {
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return err
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}
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if stat.Size() != size {
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return fmt.Errorf("error, expected size %d, got %d", size, stat.Size())
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}
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return nil
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}
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// TestFreezerRepairDanglingIndex checks that if the index has more entries than there are data,
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// the index is repaired
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func TestFreezerRepairDanglingIndex(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("dangling_indextest-%d", rand.Uint64())
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{ // Fill a table and close it
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 9 times : 150 bytes
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for x := 0; x < 9; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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// The last item should be there
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if _, err = f.Retrieve(f.items - 1); err != nil {
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f.Close()
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t.Fatal(err)
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}
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f.Close()
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// File sizes should be 45, 45, 45 : items[3, 3, 3)
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}
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// Crop third file
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fileToCrop := filepath.Join(os.TempDir(), fmt.Sprintf("%s.0002.rdat", fname))
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// Truncate third file: 45 ,45, 20
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{
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if err := assertFileSize(fileToCrop, 45); err != nil {
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t.Fatal(err)
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}
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file, err := os.OpenFile(fileToCrop, os.O_RDWR, 0644)
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if err != nil {
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t.Fatal(err)
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}
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file.Truncate(20)
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file.Close()
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}
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// Open db it again
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// It should restore the file(s) to
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// 45, 45, 15
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// with 3+3+1 items
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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if f.items != 7 {
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f.Close()
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t.Fatalf("expected %d items, got %d", 7, f.items)
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}
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if err := assertFileSize(fileToCrop, 15); err != nil {
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t.Fatal(err)
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}
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}
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}
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func TestFreezerTruncate(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("truncation-%d", rand.Uint64())
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{ // Fill table
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 30 times
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for x := 0; x < 30; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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// The last item should be there
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if _, err = f.Retrieve(f.items - 1); err != nil {
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t.Fatal(err)
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}
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f.Close()
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}
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// Reopen, truncate
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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f.truncate(10) // 150 bytes
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if f.items != 10 {
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t.Fatalf("expected %d items, got %d", 10, f.items)
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}
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// 45, 45, 45, 15 -- bytes should be 15
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if f.headBytes != 15 {
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t.Fatalf("expected %d bytes, got %d", 15, f.headBytes)
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}
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}
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}
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// TestFreezerRepairFirstFile tests a head file with the very first item only half-written.
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// That will rewind the index, and _should_ truncate the head file
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func TestFreezerRepairFirstFile(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("truncationfirst-%d", rand.Uint64())
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{ // Fill table
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 80 bytes, splitting out into two files
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f.Append(0, getChunk(40, 0xFF))
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f.Append(1, getChunk(40, 0xEE))
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// The last item should be there
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if _, err = f.Retrieve(f.items - 1); err != nil {
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t.Fatal(err)
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}
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f.Close()
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}
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// Truncate the file in half
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fileToCrop := filepath.Join(os.TempDir(), fmt.Sprintf("%s.0001.rdat", fname))
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{
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if err := assertFileSize(fileToCrop, 40); err != nil {
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t.Fatal(err)
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}
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file, err := os.OpenFile(fileToCrop, os.O_RDWR, 0644)
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if err != nil {
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t.Fatal(err)
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}
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file.Truncate(20)
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file.Close()
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}
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// Reopen
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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if f.items != 1 {
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f.Close()
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t.Fatalf("expected %d items, got %d", 0, f.items)
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}
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// Write 40 bytes
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f.Append(1, getChunk(40, 0xDD))
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f.Close()
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// Should have been truncated down to zero and then 40 written
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if err := assertFileSize(fileToCrop, 40); err != nil {
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t.Fatal(err)
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}
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}
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}
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// TestFreezerReadAndTruncate tests:
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// - we have a table open
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// - do some reads, so files are open in readonly
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// - truncate so those files are 'removed'
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// - check that we did not keep the rdonly file descriptors
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func TestFreezerReadAndTruncate(t *testing.T) {
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t.Parallel()
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rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
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fname := fmt.Sprintf("read_truncate-%d", rand.Uint64())
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{ // Fill table
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
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t.Fatal(err)
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}
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// Write 15 bytes 30 times
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for x := 0; x < 30; x++ {
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data := getChunk(15, x)
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f.Append(uint64(x), data)
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}
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// The last item should be there
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if _, err = f.Retrieve(f.items - 1); err != nil {
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t.Fatal(err)
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}
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f.Close()
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}
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// Reopen and read all files
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{
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f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 50, true)
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if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if f.items != 30 {
|
|
f.Close()
|
|
t.Fatalf("expected %d items, got %d", 0, f.items)
|
|
}
|
|
for y := byte(0); y < 30; y++ {
|
|
f.Retrieve(uint64(y))
|
|
}
|
|
// Now, truncate back to zero
|
|
f.truncate(0)
|
|
// Write the data again
|
|
for x := 0; x < 30; x++ {
|
|
data := getChunk(15, ^x)
|
|
if err := f.Append(uint64(x), data); err != nil {
|
|
t.Fatalf("error %v", err)
|
|
}
|
|
}
|
|
f.Close()
|
|
}
|
|
}
|
|
|
|
func TestOffset(t *testing.T) {
|
|
t.Parallel()
|
|
rm, wm, sg := metrics.NewMeter(), metrics.NewMeter(), metrics.NewGauge()
|
|
fname := fmt.Sprintf("offset-%d", rand.Uint64())
|
|
{ // Fill table
|
|
f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 40, true)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
// Write 6 x 20 bytes, splitting out into three files
|
|
f.Append(0, getChunk(20, 0xFF))
|
|
f.Append(1, getChunk(20, 0xEE))
|
|
|
|
f.Append(2, getChunk(20, 0xdd))
|
|
f.Append(3, getChunk(20, 0xcc))
|
|
|
|
f.Append(4, getChunk(20, 0xbb))
|
|
f.Append(5, getChunk(20, 0xaa))
|
|
f.DumpIndex(0, 100)
|
|
f.Close()
|
|
}
|
|
// Now crop it.
|
|
{
|
|
// delete files 0 and 1
|
|
for i := 0; i < 2; i++ {
|
|
p := filepath.Join(os.TempDir(), fmt.Sprintf("%v.%04d.rdat", fname, i))
|
|
if err := os.Remove(p); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
// Read the index file
|
|
p := filepath.Join(os.TempDir(), fmt.Sprintf("%v.ridx", fname))
|
|
indexFile, err := os.OpenFile(p, os.O_RDWR, 0644)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
indexBuf := make([]byte, 7*indexEntrySize)
|
|
indexFile.Read(indexBuf)
|
|
|
|
// Update the index file, so that we store
|
|
// [ file = 2, offset = 4 ] at index zero
|
|
|
|
tailId := uint32(2) // First file is 2
|
|
itemOffset := uint32(4) // We have removed four items
|
|
zeroIndex := indexEntry{
|
|
filenum: tailId,
|
|
offset: itemOffset,
|
|
}
|
|
buf := zeroIndex.marshallBinary()
|
|
// Overwrite index zero
|
|
copy(indexBuf, buf)
|
|
// Remove the four next indices by overwriting
|
|
copy(indexBuf[indexEntrySize:], indexBuf[indexEntrySize*5:])
|
|
indexFile.WriteAt(indexBuf, 0)
|
|
// Need to truncate the moved index items
|
|
indexFile.Truncate(indexEntrySize * (1 + 2))
|
|
indexFile.Close()
|
|
|
|
}
|
|
// Now open again
|
|
checkPresent := func(numDeleted uint64) {
|
|
f, err := newCustomTable(os.TempDir(), fname, rm, wm, sg, 40, true)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
f.DumpIndex(0, 100)
|
|
// It should allow writing item 6
|
|
f.Append(numDeleted+2, getChunk(20, 0x99))
|
|
|
|
// It should be fine to fetch 4,5,6
|
|
if got, err := f.Retrieve(numDeleted); err != nil {
|
|
t.Fatal(err)
|
|
} else if exp := getChunk(20, 0xbb); !bytes.Equal(got, exp) {
|
|
t.Fatalf("expected %x got %x", exp, got)
|
|
}
|
|
if got, err := f.Retrieve(numDeleted + 1); err != nil {
|
|
t.Fatal(err)
|
|
} else if exp := getChunk(20, 0xaa); !bytes.Equal(got, exp) {
|
|
t.Fatalf("expected %x got %x", exp, got)
|
|
}
|
|
if got, err := f.Retrieve(numDeleted + 2); err != nil {
|
|
t.Fatal(err)
|
|
} else if exp := getChunk(20, 0x99); !bytes.Equal(got, exp) {
|
|
t.Fatalf("expected %x got %x", exp, got)
|
|
}
|
|
|
|
// It should error at 0, 1,2,3
|
|
for i := numDeleted - 1; i > numDeleted-10; i-- {
|
|
if _, err := f.Retrieve(i); err == nil {
|
|
t.Fatal("expected err")
|
|
}
|
|
}
|
|
}
|
|
checkPresent(4)
|
|
// Now, let's pretend we have deleted 1M items
|
|
{
|
|
// Read the index file
|
|
p := filepath.Join(os.TempDir(), fmt.Sprintf("%v.ridx", fname))
|
|
indexFile, err := os.OpenFile(p, os.O_RDWR, 0644)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
indexBuf := make([]byte, 3*indexEntrySize)
|
|
indexFile.Read(indexBuf)
|
|
|
|
// Update the index file, so that we store
|
|
// [ file = 2, offset = 1M ] at index zero
|
|
|
|
tailId := uint32(2) // First file is 2
|
|
itemOffset := uint32(1000000) // We have removed 1M items
|
|
zeroIndex := indexEntry{
|
|
offset: itemOffset,
|
|
filenum: tailId,
|
|
}
|
|
buf := zeroIndex.marshallBinary()
|
|
// Overwrite index zero
|
|
copy(indexBuf, buf)
|
|
indexFile.WriteAt(indexBuf, 0)
|
|
indexFile.Close()
|
|
}
|
|
checkPresent(1000000)
|
|
}
|
|
|
|
// TODO (?)
|
|
// - test that if we remove several head-files, aswell as data last data-file,
|
|
// the index is truncated accordingly
|
|
// Right now, the freezer would fail on these conditions:
|
|
// 1. have data files d0, d1, d2, d3
|
|
// 2. remove d2,d3
|
|
//
|
|
// However, all 'normal' failure modes arising due to failing to sync() or save a file
|
|
// should be handled already, and the case described above can only (?) happen if an
|
|
// external process/user deletes files from the filesystem.
|
|
|
|
// TestAppendTruncateParallel is a test to check if the Append/truncate operations are
|
|
// racy.
|
|
//
|
|
// The reason why it's not a regular fuzzer, within tests/fuzzers, is that it is dependent
|
|
// on timing rather than 'clever' input -- there's no determinism.
|
|
func TestAppendTruncateParallel(t *testing.T) {
|
|
dir, err := ioutil.TempDir("", "freezer")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer os.RemoveAll(dir)
|
|
|
|
f, err := newCustomTable(dir, "tmp", metrics.NilMeter{}, metrics.NilMeter{}, metrics.NilGauge{}, 8, true)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
fill := func(mark uint64) []byte {
|
|
data := make([]byte, 8)
|
|
binary.LittleEndian.PutUint64(data, mark)
|
|
return data
|
|
}
|
|
|
|
for i := 0; i < 5000; i++ {
|
|
f.truncate(0)
|
|
data0 := fill(0)
|
|
f.Append(0, data0)
|
|
data1 := fill(1)
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(2)
|
|
go func() {
|
|
f.truncate(0)
|
|
wg.Done()
|
|
}()
|
|
go func() {
|
|
f.Append(1, data1)
|
|
wg.Done()
|
|
}()
|
|
wg.Wait()
|
|
|
|
if have, err := f.Retrieve(0); err == nil {
|
|
if !bytes.Equal(have, data0) {
|
|
t.Fatalf("have %x want %x", have, data0)
|
|
}
|
|
}
|
|
}
|
|
}
|