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command.go
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command.go
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package compact
import (
"bufio"
"bytes"
"errors"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
"time"
"github.com/influxdata/influxdb/cmd/influx_tools/internal/errlist"
"github.com/influxdata/influxdb/cmd/influx_tools/internal/format/binary"
"github.com/influxdata/influxdb/cmd/influx_tools/internal/format/line"
"github.com/influxdata/influxdb/logger"
"github.com/influxdata/influxdb/pkg/limiter"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
"go.uber.org/zap"
)
var (
_ line.Writer
_ binary.Writer
)
// Command represents the program execution for "influx-tools compact".
type Command struct {
// Standard input/output, overridden for testing.
Stderr io.Writer
Stdout io.Writer
Logger *zap.Logger
path string
force bool
verbose bool
}
// NewCommand returns a new instance of the export Command.
func NewCommand() *Command {
return &Command{
Stderr: os.Stderr,
Stdout: os.Stdout,
}
}
// Run executes the export command using the specified args.
func (cmd *Command) Run(args []string) (err error) {
err = cmd.parseFlags(args)
if err != nil {
return err
}
var log = zap.NewNop()
if cmd.verbose {
cfg := logger.Config{Format: "logfmt"}
log, err = cfg.New(os.Stdout)
if err != nil {
return err
}
}
fmt.Fprintf(cmd.Stdout, "opening shard at path %q\n\n", cmd.path)
sc, err := newShardCompactor(cmd.path, log)
if err != nil {
return err
}
fmt.Fprintln(cmd.Stdout)
fmt.Fprintln(cmd.Stdout, "The following files will be compacted:")
fmt.Fprintln(cmd.Stdout)
fmt.Fprintln(cmd.Stdout, sc.String())
if !cmd.force {
fmt.Fprint(cmd.Stdout, "Proceed? [N] ")
scan := bufio.NewScanner(os.Stdin)
scan.Scan()
if scan.Err() != nil {
return fmt.Errorf("error reading STDIN: %v", scan.Err())
}
if strings.ToLower(scan.Text()) != "y" {
return nil
}
}
fmt.Fprintln(cmd.Stdout, "Compacting shard.")
err = sc.CompactShard()
if err != nil {
return fmt.Errorf("compaction failed: %v", err)
}
fmt.Fprintln(cmd.Stdout, "Compaction succeeded. New files:")
for _, f := range sc.newTSM {
fmt.Fprintf(cmd.Stdout, " %s\n", f)
}
return nil
}
func (cmd *Command) parseFlags(args []string) error {
fs := flag.NewFlagSet("compact-shard", flag.ContinueOnError)
fs.StringVar(&cmd.path, "path", "", "path of shard to be compacted")
fs.BoolVar(&cmd.force, "force", false, "Force compaction without prompting")
fs.BoolVar(&cmd.verbose, "verbose", false, "Enable verbose logging")
if err := fs.Parse(args); err != nil {
return err
}
if cmd.path == "" {
return errors.New("shard-path is required")
}
return nil
}
type shardCompactor struct {
logger *zap.Logger
path string
tsm []string
tombstone []string
readers []*tsm1.TSMReader
files map[string]*tsm1.TSMReader
newTSM []string
}
func newShardCompactor(path string, logger *zap.Logger) (sc *shardCompactor, err error) {
sc = &shardCompactor{
logger: logger,
path: path,
files: make(map[string]*tsm1.TSMReader),
}
sc.tsm, err = filepath.Glob(filepath.Join(path, fmt.Sprintf("*.%s", tsm1.TSMFileExtension)))
if err != nil {
return nil, fmt.Errorf("newFileStore: error reading tsm files at path %q: %v", path, err)
}
if len(sc.tsm) == 0 {
return nil, fmt.Errorf("newFileStore: no tsm files at path %q", path)
}
sort.Strings(sc.tsm)
sc.tombstone, err = filepath.Glob(filepath.Join(path, fmt.Sprintf("*.%s", "tombstone")))
if err != nil {
return nil, fmt.Errorf("error reading tombstone files: %v", err)
}
if err := sc.openFiles(); err != nil {
return nil, err
}
return sc, nil
}
func (sc *shardCompactor) openFiles() error {
sc.readers = make([]*tsm1.TSMReader, 0, len(sc.tsm))
// struct to hold the result of opening each reader in a goroutine
type res struct {
r *tsm1.TSMReader
err error
}
lim := limiter.NewFixed(runtime.GOMAXPROCS(0))
readerC := make(chan *res)
for i, fn := range sc.tsm {
file, err := os.OpenFile(fn, os.O_RDONLY, 0666)
if err != nil {
return fmt.Errorf("newFileStore: failed to open file %q: %v", fn, err)
}
go func(idx int, file *os.File) {
// Ensure a limited number of TSM files are loaded at once.
// Systems which have very large datasets (1TB+) can have thousands
// of TSM files which can cause extremely long load times.
lim.Take()
defer lim.Release()
start := time.Now()
df, err := tsm1.NewTSMReader(file)
sc.logger.Info("Opened file",
zap.String("path", file.Name()),
zap.Int("id", idx),
zap.Duration("duration", time.Since(start)))
// If we are unable to read a TSM file then log the error, rename
// the file, and continue loading the shard without it.
if err != nil {
sc.logger.Error("Cannot read corrupt tsm file, renaming", zap.String("path", file.Name()), zap.Int("id", idx), zap.Error(err))
if e := os.Rename(file.Name(), file.Name()+"."+tsm1.BadTSMFileExtension); e != nil {
sc.logger.Error("Cannot rename corrupt tsm file", zap.String("path", file.Name()), zap.Int("id", idx), zap.Error(e))
readerC <- &res{r: df, err: fmt.Errorf("cannot rename corrupt file %s: %v", file.Name(), e)}
return
}
}
readerC <- &res{r: df}
}(i, file)
}
for range sc.tsm {
res := <-readerC
if res.err != nil {
return res.err
} else if res.r == nil {
continue
}
sc.readers = append(sc.readers, res.r)
sc.files[res.r.Path()] = res.r
}
close(readerC)
sort.Sort(tsmReaders(sc.readers))
return nil
}
func (sc *shardCompactor) CompactShard() (err error) {
c := tsm1.NewCompactor()
c.Dir = sc.path
c.Size = tsm1.DefaultSegmentSize
c.FileStore = sc
c.Open()
tsmFiles, err := c.CompactFull(sc.tsm)
if err == nil {
sc.newTSM, err = sc.replace(tsmFiles)
}
return err
}
// replace replaces the existing shard files with temporary tsmFiles
func (sc *shardCompactor) replace(tsmFiles []string) ([]string, error) {
// rename .tsm.tmp → .tsm
var newNames []string
for _, file := range tsmFiles {
var newName = file[:len(file)-4] // remove extension
if err := os.Rename(file, newName); err != nil {
return nil, err
}
newNames = append(newNames, newName)
}
var errs errlist.ErrorList
// close all readers
for _, r := range sc.readers {
r.Close()
}
sc.readers = nil
sc.files = nil
// remove existing .tsm and .tombstone
for _, file := range sc.tsm {
errs.Add(os.Remove(file))
}
for _, file := range sc.tombstone {
errs.Add(os.Remove(file))
}
return newNames, errs.Err()
}
func (sc *shardCompactor) NextGeneration() int {
panic("not implemented")
}
func (sc *shardCompactor) TSMReader(path string) *tsm1.TSMReader {
r := sc.files[path]
if r != nil {
r.Ref()
}
return r
}
func (sc *shardCompactor) String() string {
var sb bytes.Buffer
sb.WriteString("TSM:\n")
for _, f := range sc.tsm {
sb.WriteString(" ")
sb.WriteString(f)
sb.WriteByte('\n')
}
if len(sc.tombstone) > 0 {
sb.WriteString("\nTombstone:\n")
for _, f := range sc.tombstone {
sb.WriteString(" ")
sb.WriteString(f)
sb.WriteByte('\n')
}
}
return sb.String()
}
type tsmReaders []*tsm1.TSMReader
func (a tsmReaders) Len() int { return len(a) }
func (a tsmReaders) Less(i, j int) bool { return a[i].Path() < a[j].Path() }
func (a tsmReaders) Swap(i, j int) { a[i], a[j] = a[j], a[i] }