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@ -1,6 +1,8 @@ |
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package ethdb |
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import ( |
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"strconv" |
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"strings" |
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"time" |
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"github.com/ethereum/go-ethereum/compression/rle" |
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@ -22,9 +24,12 @@ type LDBDatabase struct { |
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GetTimer metrics.Timer // Timer for measuring the database get request counts and latencies
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PutTimer metrics.Timer // Timer for measuring the database put request counts and latencies
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DelTimer metrics.Timer // Timer for measuring the database delete request counts and latencies
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MissMeter metrics.Meter // MEter for measuring the missed database get requests
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MissMeter metrics.Meter // Meter for measuring the missed database get requests
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ReadMeter metrics.Meter // Meter for measuring the database get request data usage
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WriteMeter metrics.Meter // Meter for measuring the database put request data usage
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CompTimeMeter metrics.Meter // Meter for measuring the total time spent in database compaction
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CompReadMeter metrics.Meter // Meter for measuring the data read during compaction
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CompWriteMeter metrics.Meter // Meter for measuring the data written during compaction
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} |
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// NewLDBDatabase returns a LevelDB wrapped object. LDBDatabase does not persist data by
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@ -45,6 +50,7 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) { |
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fn: file, |
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db: db, |
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} |
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go database.meter(3 * time.Second) |
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return database, nil |
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} |
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@ -53,8 +59,7 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) { |
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func (self *LDBDatabase) Put(key []byte, value []byte) error { |
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// Measure the database put latency, if requested
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if self.PutTimer != nil { |
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start := time.Now() |
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defer self.PutTimer.UpdateSince(start) |
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defer self.PutTimer.UpdateSince(time.Now()) |
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} |
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// Generate the data to write to disk, update the meter and write
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dat := rle.Compress(value) |
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@ -69,8 +74,7 @@ func (self *LDBDatabase) Put(key []byte, value []byte) error { |
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func (self *LDBDatabase) Get(key []byte) ([]byte, error) { |
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// Measure the database get latency, if requested
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if self.GetTimer != nil { |
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start := time.Now() |
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defer self.GetTimer.UpdateSince(start) |
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defer self.GetTimer.UpdateSince(time.Now()) |
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} |
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// Retrieve the key and increment the miss counter if not found
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dat, err := self.db.Get(key, nil) |
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@ -91,8 +95,7 @@ func (self *LDBDatabase) Get(key []byte) ([]byte, error) { |
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func (self *LDBDatabase) Delete(key []byte) error { |
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// Measure the database delete latency, if requested
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if self.DelTimer != nil { |
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start := time.Now() |
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defer self.DelTimer.UpdateSince(start) |
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defer self.DelTimer.UpdateSince(time.Now()) |
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} |
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// Execute the actual operation
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return self.db.Delete(key, nil) |
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@ -111,7 +114,6 @@ func (self *LDBDatabase) Close() { |
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if err := self.Flush(); err != nil { |
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glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err) |
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} |
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self.db.Close() |
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glog.V(logger.Error).Infoln("flushed and closed db:", self.fn) |
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} |
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@ -119,3 +121,72 @@ func (self *LDBDatabase) Close() { |
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func (self *LDBDatabase) LDB() *leveldb.DB { |
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return self.db |
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} |
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// meter periodically retrieves internal leveldb counters and reports them to
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// the metrics subsystem.
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//
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// This is how a stats table look like (currently):
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// Compactions
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// Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
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// -------+------------+---------------+---------------+---------------+---------------
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// 0 | 0 | 0.00000 | 1.27969 | 0.00000 | 12.31098
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// 1 | 85 | 109.27913 | 28.09293 | 213.92493 | 214.26294
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// 2 | 523 | 1000.37159 | 7.26059 | 66.86342 | 66.77884
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// 3 | 570 | 1113.18458 | 0.00000 | 0.00000 | 0.00000
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func (self *LDBDatabase) meter(refresh time.Duration) { |
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// Create the counters to store current and previous values
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counters := make([][]float64, 2) |
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for i := 0; i < 2; i++ { |
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counters[i] = make([]float64, 3) |
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} |
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// Iterate ad infinitum and collect the stats
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for i := 1; ; i++ { |
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// Retrieve the database stats
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stats, err := self.db.GetProperty("leveldb.stats") |
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if err != nil { |
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glog.V(logger.Error).Infof("failed to read database stats: %v", err) |
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return |
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} |
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// Find the compaction table, skip the header
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lines := strings.Split(stats, "\n") |
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for len(lines) > 0 && strings.TrimSpace(lines[0]) != "Compactions" { |
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lines = lines[1:] |
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} |
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if len(lines) <= 3 { |
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glog.V(logger.Error).Infof("compaction table not found") |
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return |
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} |
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lines = lines[3:] |
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// Iterate over all the table rows, and accumulate the entries
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for j := 0; j < len(counters[i%2]); j++ { |
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counters[i%2][j] = 0 |
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} |
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for _, line := range lines { |
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parts := strings.Split(line, "|") |
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if len(parts) != 6 { |
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break |
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} |
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for idx, counter := range parts[3:] { |
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if value, err := strconv.ParseFloat(strings.TrimSpace(counter), 64); err != nil { |
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glog.V(logger.Error).Infof("compaction entry parsing failed: %v", err) |
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return |
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} else { |
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counters[i%2][idx] += value |
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} |
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} |
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} |
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// Update all the requested meters
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if self.CompTimeMeter != nil { |
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self.CompTimeMeter.Mark(int64((counters[i%2][0] - counters[(i-1)%2][0]) * 1000 * 1000 * 1000)) |
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} |
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if self.CompReadMeter != nil { |
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self.CompReadMeter.Mark(int64((counters[i%2][1] - counters[(i-1)%2][1]) * 1024 * 1024)) |
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} |
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if self.CompWriteMeter != nil { |
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self.CompWriteMeter.Mark(int64((counters[i%2][2] - counters[(i-1)%2][2]) * 1024 * 1024)) |
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} |
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// Sleep a bit, then repeat the stats collection
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time.Sleep(refresh) |
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} |
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} |
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Jeffrey Wilcke
9 years ago