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Merge pull request #1447 from karalabe/fix-database-metrics-race-3

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eth, ethdb: fix a data race during startup/shutdown
This commit is contained in:
Jeffrey Wilcke 2015-07-09 07:22:54 -07:00
commit cd6d703e94
2 changed files with 83 additions and 61 deletions
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28
eth/backend.go
View File

@ -41,7 +41,6 @@ import (
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/miner"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
@ -267,42 +266,21 @@ func New(config *Config) (*Ethereum, error) {
return nil, fmt.Errorf("blockchain db err: %v", err)
}
if db, ok := blockDb.(*ethdb.LDBDatabase); ok {
db.GetTimer = metrics.NewTimer("eth/db/block/user/gets")
db.PutTimer = metrics.NewTimer("eth/db/block/user/puts")
db.MissMeter = metrics.NewMeter("eth/db/block/user/misses")
db.ReadMeter = metrics.NewMeter("eth/db/block/user/reads")
db.WriteMeter = metrics.NewMeter("eth/db/block/user/writes")
db.CompTimeMeter = metrics.NewMeter("eth/db/block/compact/time")
db.CompReadMeter = metrics.NewMeter("eth/db/block/compact/input")
db.CompWriteMeter = metrics.NewMeter("eth/db/block/compact/output")
db.Meter("eth/db/block/")
}
stateDb, err := newdb(filepath.Join(config.DataDir, "state"))
if err != nil {
return nil, fmt.Errorf("state db err: %v", err)
}
if db, ok := stateDb.(*ethdb.LDBDatabase); ok {
db.GetTimer = metrics.NewTimer("eth/db/state/user/gets")
db.PutTimer = metrics.NewTimer("eth/db/state/user/puts")
db.MissMeter = metrics.NewMeter("eth/db/state/user/misses")
db.ReadMeter = metrics.NewMeter("eth/db/state/user/reads")
db.WriteMeter = metrics.NewMeter("eth/db/state/user/writes")
db.CompTimeMeter = metrics.NewMeter("eth/db/state/compact/time")
db.CompReadMeter = metrics.NewMeter("eth/db/state/compact/input")
db.CompWriteMeter = metrics.NewMeter("eth/db/state/compact/output")
db.Meter("eth/db/state/")
}
extraDb, err := newdb(filepath.Join(config.DataDir, "extra"))
if err != nil {
return nil, fmt.Errorf("extra db err: %v", err)
}
if db, ok := extraDb.(*ethdb.LDBDatabase); ok {
db.GetTimer = metrics.NewTimer("eth/db/extra/user/gets")
db.PutTimer = metrics.NewTimer("eth/db/extra/user/puts")
db.MissMeter = metrics.NewMeter("eth/db/extra/user/misses")
db.ReadMeter = metrics.NewMeter("eth/db/extra/user/reads")
db.WriteMeter = metrics.NewMeter("eth/db/extra/user/writes")
db.CompTimeMeter = metrics.NewMeter("eth/db/extra/compact/time")
db.CompReadMeter = metrics.NewMeter("eth/db/extra/compact/input")
db.CompWriteMeter = metrics.NewMeter("eth/db/extra/compact/output")
db.Meter("eth/db/extra/")
}
nodeDb := filepath.Join(config.DataDir, "nodes")

116
ethdb/database.go
View File

@ -19,16 +19,19 @@ package ethdb
import (
"strconv"
"strings"
"sync"
"time"
"github.com/ethereum/go-ethereum/compression/rle"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/rcrowley/go-metrics"
"github.com/ethereum/go-ethereum/metrics"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
gometrics "github.com/rcrowley/go-metrics"
)
var OpenFileLimit = 64
@ -37,15 +40,18 @@ type LDBDatabase struct {
fn string // filename for reporting
db *leveldb.DB // LevelDB instance
GetTimer metrics.Timer // Timer for measuring the database get request counts and latencies
PutTimer metrics.Timer // Timer for measuring the database put request counts and latencies
DelTimer metrics.Timer // Timer for measuring the database delete request counts and latencies
MissMeter metrics.Meter // Meter for measuring the missed database get requests
ReadMeter metrics.Meter // Meter for measuring the database get request data usage
WriteMeter metrics.Meter // Meter for measuring the database put request data usage
CompTimeMeter metrics.Meter // Meter for measuring the total time spent in database compaction
CompReadMeter metrics.Meter // Meter for measuring the data read during compaction
CompWriteMeter metrics.Meter // Meter for measuring the data written during compaction
getTimer gometrics.Timer // Timer for measuring the database get request counts and latencies
putTimer gometrics.Timer // Timer for measuring the database put request counts and latencies
delTimer gometrics.Timer // Timer for measuring the database delete request counts and latencies
missMeter gometrics.Meter // Meter for measuring the missed database get requests
readMeter gometrics.Meter // Meter for measuring the database get request data usage
writeMeter gometrics.Meter // Meter for measuring the database put request data usage
compTimeMeter gometrics.Meter // Meter for measuring the total time spent in database compaction
compReadMeter gometrics.Meter // Meter for measuring the data read during compaction
compWriteMeter gometrics.Meter // Meter for measuring the data written during compaction
quitLock sync.Mutex // Mutex protecting the quit channel access
quitChan chan chan error // Quit channel to stop the metrics collection before closing the database
}
// NewLDBDatabase returns a LevelDB wrapped object. LDBDatabase does not persist data by
@ -54,7 +60,7 @@ type LDBDatabase struct {
func NewLDBDatabase(file string) (*LDBDatabase, error) {
// Open the db
db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: OpenFileLimit})
// check for curruption and attempt to recover
// check for corruption and attempt to recover
if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
db, err = leveldb.RecoverFile(file, nil)
}
@ -62,26 +68,23 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) {
if err != nil {
return nil, err
}
database := &LDBDatabase{
return &LDBDatabase{
fn: file,
db: db,
}
go database.meter(3 * time.Second)
return database, nil
}, nil
}
// Put puts the given key / value to the queue
func (self *LDBDatabase) Put(key []byte, value []byte) error {
// Measure the database put latency, if requested
if self.PutTimer != nil {
defer self.PutTimer.UpdateSince(time.Now())
if self.putTimer != nil {
defer self.putTimer.UpdateSince(time.Now())
}
// Generate the data to write to disk, update the meter and write
dat := rle.Compress(value)
if self.WriteMeter != nil {
self.WriteMeter.Mark(int64(len(dat)))
if self.writeMeter != nil {
self.writeMeter.Mark(int64(len(dat)))
}
return self.db.Put(key, dat, nil)
}
@ -89,20 +92,20 @@ func (self *LDBDatabase) Put(key []byte, value []byte) error {
// Get returns the given key if it's present.
func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
// Measure the database get latency, if requested
if self.GetTimer != nil {
defer self.GetTimer.UpdateSince(time.Now())
if self.getTimer != nil {
defer self.getTimer.UpdateSince(time.Now())
}
// Retrieve the key and increment the miss counter if not found
dat, err := self.db.Get(key, nil)
if err != nil {
if self.MissMeter != nil {
self.MissMeter.Mark(1)
if self.missMeter != nil {
self.missMeter.Mark(1)
}
return nil, err
}
// Otherwise update the actually retrieved amount of data
if self.ReadMeter != nil {
self.ReadMeter.Mark(int64(len(dat)))
if self.readMeter != nil {
self.readMeter.Mark(int64(len(dat)))
}
return rle.Decompress(dat)
}
@ -110,8 +113,8 @@ func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
// Delete deletes the key from the queue and database
func (self *LDBDatabase) Delete(key []byte) error {
// Measure the database delete latency, if requested
if self.DelTimer != nil {
defer self.DelTimer.UpdateSince(time.Now())
if self.delTimer != nil {
defer self.delTimer.UpdateSince(time.Now())
}
// Execute the actual operation
return self.db.Delete(key, nil)
@ -127,8 +130,20 @@ func (self *LDBDatabase) Flush() error {
}
func (self *LDBDatabase) Close() {
// Stop the metrics collection to avoid internal database races
self.quitLock.Lock()
defer self.quitLock.Unlock()
if self.quitChan != nil {
errc := make(chan error)
self.quitChan <- errc
if err := <-errc; err != nil {
glog.V(logger.Error).Infof("metrics failure in '%s': %v\n", self.fn, err)
}
}
// Flush and close the database
if err := self.Flush(); err != nil {
glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err)
glog.V(logger.Error).Infof("flushing '%s' failed: %v\n", self.fn, err)
}
self.db.Close()
glog.V(logger.Error).Infoln("flushed and closed db:", self.fn)
@ -138,6 +153,27 @@ func (self *LDBDatabase) LDB() *leveldb.DB {
return self.db
}
// Meter configures the database metrics collectors and
func (self *LDBDatabase) Meter(prefix string) {
// Initialize all the metrics collector at the requested prefix
self.getTimer = metrics.NewTimer(prefix + "user/gets")
self.putTimer = metrics.NewTimer(prefix + "user/puts")
self.delTimer = metrics.NewTimer(prefix + "user/dels")
self.missMeter = metrics.NewMeter(prefix + "user/misses")
self.readMeter = metrics.NewMeter(prefix + "user/reads")
self.writeMeter = metrics.NewMeter(prefix + "user/writes")
self.compTimeMeter = metrics.NewMeter(prefix + "compact/time")
self.compReadMeter = metrics.NewMeter(prefix + "compact/input")
self.compWriteMeter = metrics.NewMeter(prefix + "compact/output")
// Create a quit channel for the periodic collector and run it
self.quitLock.Lock()
self.quitChan = make(chan chan error)
self.quitLock.Unlock()
go self.meter(3 * time.Second)
}
// meter periodically retrieves internal leveldb counters and reports them to
// the metrics subsystem.
//
@ -193,16 +229,24 @@ func (self *LDBDatabase) meter(refresh time.Duration) {
}
}
// Update all the requested meters
if self.CompTimeMeter != nil {
self.CompTimeMeter.Mark(int64((counters[i%2][0] - counters[(i-1)%2][0]) * 1000 * 1000 * 1000))
if self.compTimeMeter != nil {
self.compTimeMeter.Mark(int64((counters[i%2][0] - counters[(i-1)%2][0]) * 1000 * 1000 * 1000))
}
if self.CompReadMeter != nil {
self.CompReadMeter.Mark(int64((counters[i%2][1] - counters[(i-1)%2][1]) * 1024 * 1024))
if self.compReadMeter != nil {
self.compReadMeter.Mark(int64((counters[i%2][1] - counters[(i-1)%2][1]) * 1024 * 1024))
}
if self.CompWriteMeter != nil {
self.CompWriteMeter.Mark(int64((counters[i%2][2] - counters[(i-1)%2][2]) * 1024 * 1024))
if self.compWriteMeter != nil {
self.compWriteMeter.Mark(int64((counters[i%2][2] - counters[(i-1)%2][2]) * 1024 * 1024))
}
// Sleep a bit, then repeat the stats collection
time.Sleep(refresh)
select {
case errc := <-self.quitChan:
// Quit requesting, stop hammering the database
errc <- nil
return
case <-time.After(refresh):
// Timeout, gather a new set of stats
}
}
}