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mvcc: add store revision metrics

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Add experimental metrics etcd_debugging_mvcc_current_revision and
etcd_debugging_mvcc_compact_revision.
This commit is contained in:
Jingyi Hu 2019-09-05 15:40:06 -07:00
parent e2035ba49a
commit 0f8c46a0f3
2 changed files with 65 additions and 13 deletions
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44
mvcc/kvstore.go
View File

@ -355,19 +355,7 @@ func (s *store) Restore(b backend.Backend) error {
}
func (s *store) restore() error {
b := s.b
reportDbTotalSizeInBytesMu.Lock()
reportDbTotalSizeInBytes = func() float64 { return float64(b.Size()) }
reportDbTotalSizeInBytesMu.Unlock()
reportDbTotalSizeInBytesDebugMu.Lock()
reportDbTotalSizeInBytesDebug = func() float64 { return float64(b.Size()) }
reportDbTotalSizeInBytesDebugMu.Unlock()
reportDbTotalSizeInUseInBytesMu.Lock()
reportDbTotalSizeInUseInBytes = func() float64 { return float64(b.SizeInUse()) }
reportDbTotalSizeInUseInBytesMu.Unlock()
reportDbOpenReadTxNMu.Lock()
reportDbOpenReadTxN = func() float64 { return float64(b.OpenReadTxN()) }
reportDbOpenReadTxNMu.Unlock()
s.setupMetricsReporter()
min, max := newRevBytes(), newRevBytes()
revToBytes(revision{main: 1}, min)
@ -579,6 +567,36 @@ func (s *store) ConsistentIndex() uint64 {
return v
}
func (s *store) setupMetricsReporter() {
b := s.b
reportDbTotalSizeInBytesMu.Lock()
reportDbTotalSizeInBytes = func() float64 { return float64(b.Size()) }
reportDbTotalSizeInBytesMu.Unlock()
reportDbTotalSizeInBytesDebugMu.Lock()
reportDbTotalSizeInBytesDebug = func() float64 { return float64(b.Size()) }
reportDbTotalSizeInBytesDebugMu.Unlock()
reportDbTotalSizeInUseInBytesMu.Lock()
reportDbTotalSizeInUseInBytes = func() float64 { return float64(b.SizeInUse()) }
reportDbTotalSizeInUseInBytesMu.Unlock()
reportDbOpenReadTxNMu.Lock()
reportDbOpenReadTxN = func() float64 { return float64(b.OpenReadTxN()) }
reportDbOpenReadTxNMu.Unlock()
reportCurrentRevMu.Lock()
reportCurrentRev = func() float64 {
s.revMu.RLock()
defer s.revMu.RUnlock()
return float64(s.currentRev)
}
reportCurrentRevMu.Unlock()
reportCompactRevMu.Lock()
reportCompactRev = func() float64 {
s.revMu.RLock()
defer s.revMu.RUnlock()
return float64(s.compactMainRev)
}
reportCompactRevMu.Unlock()
}
// appendMarkTombstone appends tombstone mark to normal revision bytes.
func appendMarkTombstone(lg *zap.Logger, b []byte) []byte {
if len(b) != revBytesLen {

34
mvcc/metrics.go
View File

@ -264,6 +264,38 @@ var (
// highest bucket start of 0.01 sec * 2^14 == 163.84 sec
Buckets: prometheus.ExponentialBuckets(.01, 2, 15),
})
currentRev = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "etcd_debugging",
Subsystem: "mvcc",
Name: "current_revision",
Help: "The current revision of store.",
},
func() float64 {
reportCurrentRevMu.RLock()
defer reportCurrentRevMu.RUnlock()
return reportCurrentRev()
},
)
// overridden by mvcc initialization
reportCurrentRevMu sync.RWMutex
reportCurrentRev = func() float64 { return 0 }
compactRev = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "etcd_debugging",
Subsystem: "mvcc",
Name: "compact_revision",
Help: "The revision of the last compaction in store.",
},
func() float64 {
reportCompactRevMu.RLock()
defer reportCompactRevMu.RUnlock()
return reportCompactRev()
},
)
// overridden by mvcc initialization
reportCompactRevMu sync.RWMutex
reportCompactRev = func() float64 { return 0 }
)
func init() {
@ -291,6 +323,8 @@ func init() {
prometheus.MustRegister(dbOpenReadTxN)
prometheus.MustRegister(hashSec)
prometheus.MustRegister(hashRevSec)
prometheus.MustRegister(currentRev)
prometheus.MustRegister(compactRev)
}
// ReportEventReceived reports that an event is received.