perf(storagenode): check log level

This PR slightly improves the storage node's performance by checking the log level, making the
logger not make slices in advance.

internal/storagenode/logstream/committer.go

@@ -64,10 +64,12 @@ func (cm *committer) sendCommitWaitTask(_ context.Context, cwts *listQueue) (err
 		if err != nil {
 			inflight = atomic.AddInt64(&cm.inflightCommitWait, -int64(cnt))
 		}
-		cm.logger.Debug("send committer commit wait tasks",
-			zap.Int64("inflight", inflight),
-			zap.Error(err),
-		)
+		if ce := cm.logger.Check(zap.DebugLevel, "send committer commit wait tasks"); ce != nil {
+			ce.Write(
+				zap.Int64("inflight", inflight),
+				zap.Error(err),
+			)
+		}
 	}()
 
 	switch cm.lse.esm.load() {
@@ -143,17 +145,21 @@ func (cm *committer) commitLoopInternal(ctx context.Context, ct *commitTask) {
 	// TODO: Move these condition expressions to `internal/storagenode/logstream.(*committer).commit` method.
 	commitVersion, _, _, invalid := cm.lse.lsc.reportCommitBase()
 	if ct.stale(commitVersion) {
-		cm.logger.Debug("discard a stale commit message",
-			zap.Any("replica", commitVersion),
-			zap.Any("commit", ct.version),
-		)
+		if ce := cm.logger.Check(zap.DebugLevel, "discard a stale commit message"); ce != nil {
+			ce.Write(
+				zap.Any("replica", commitVersion),
+				zap.Any("commit", ct.version),
+			)
+		}
 		return
 	}
 	if invalid {
 		// Synchronization should fix this invalid replica status
 		// caused by the inconsistency between the commit context and
 		// the last log entry.
-		cm.logger.Debug("discard a commit message due to invalid replica status")
+		if ce := cm.logger.Check(zap.DebugLevel, "discard a commit message due to invalid replica status"); ce != nil {
+			ce.Write()
+		}
 		return
 	}
 
@@ -323,10 +329,12 @@ func (cm *committer) commitInternal(cc storage.CommitContext, requireCommitWaitT
 
 // drainCommitWaitQ drains the commit wait tasks in commitWaitQ.
 func (cm *committer) drainCommitWaitQ(cause error) {
-	cm.logger.Debug("draining commit wait tasks",
-		zap.Int64("inflight", atomic.LoadInt64(&cm.inflightCommitWait)),
-		zap.Error(cause),
-	)
+	if ce := cm.logger.Check(zap.DebugLevel, "draining commit wait tasks"); ce != nil {
+		ce.Write(
+			zap.Int64("inflight", atomic.LoadInt64(&cm.inflightCommitWait)),
+			zap.Error(cause),
+		)
+	}
 
 	for atomic.LoadInt64(&cm.inflightCommitWait) > 0 {
 		cwt := cm.commitWaitQ.pop()
@@ -336,7 +344,9 @@ func (cm *committer) drainCommitWaitQ(cause error) {
 		cwt.awg.commitDone(cause)
 		cwt.release()
 		inflight := atomic.AddInt64(&cm.inflightCommitWait, -1)
-		cm.logger.Debug("discard a commit wait task", zap.Int64("inflight", inflight))
+		if ce := cm.logger.Check(zap.DebugLevel, "discard a commit wait task"); ce != nil {
+			ce.Write(zap.Int64("inflight", inflight))
+		}
 	}
 }
 

internal/storagenode/logstream/executor.go

@@ -344,10 +344,12 @@ func (lse *Executor) Unseal(_ context.Context, replicas []varlogpb.LogStreamRepl
 }
 
 func (lse *Executor) resetInternalState(lastCommittedLLSN types.LLSN, discardCommitWaitTasks bool) {
-	lse.logger.Debug("resetting internal state",
-		zap.Int64("inflight", atomic.LoadInt64(&lse.inflight)),
-		zap.Int64("inflight_append", atomic.LoadInt64(&lse.inflightAppend)),
-	)
+	if ce := lse.logger.Check(zap.DebugLevel, "resetting internal state"); ce != nil {
+		ce.Write(
+			zap.Int64("inflight", atomic.LoadInt64(&lse.inflight)),
+			zap.Int64("inflight_append", atomic.LoadInt64(&lse.inflightAppend)),
+		)
+	}
 
 	// close replicClients in replica connector
 	lse.rcs.close()
@@ -406,7 +408,9 @@ func (lse *Executor) Report(_ context.Context) (report snpb.LogStreamUncommitRep
 	}
 	prevUncommittedLLSNEnd := lse.prevUncommittedLLSNEnd.Load()
 	if prevUncommittedLLSNEnd != uncommittedLLSNEnd {
-		lse.logger.Debug("log stream: report", zap.Any("report", report))
+		if ce := lse.logger.Check(zap.DebugLevel, "log stream: report"); ce != nil {
+			ce.Write(zap.Any("report", report))
+		}
 		lse.prevUncommittedLLSNEnd.Store(uncommittedLLSNEnd)
 	}
 
@@ -433,7 +437,9 @@ func (lse *Executor) Commit(ctx context.Context, commitResult snpb.LogStreamComm
 	}
 
 	if types.Version(atomic.LoadUint64(&lse.prevCommitVersion)) != commitResult.Version {
-		lse.logger.Debug("commit", zap.String("commit_result", commitResult.String()))
+		if ce := lse.logger.Check(zap.DebugLevel, "commit"); ce != nil {
+			ce.Write(zap.String("commit_result", commitResult.String()))
+		}
 		atomic.StoreUint64(&lse.prevCommitVersion, uint64(commitResult.Version))
 	}
 

internal/storagenode/logstream/replicate_client.go

@@ -74,10 +74,12 @@ func (rc *replicateClient) send(ctx context.Context, rt *replicateTask) (err err
 		if err != nil {
 			inflight = atomic.AddInt64(&rc.inflight, -1)
 		}
-		rc.logger.Debug("sent replicate client a task",
-			zap.Int64("inflight", inflight),
-			zap.Error(err),
-		)
+		if ce := rc.logger.Check(zap.DebugLevel, "sent replicate client a task"); ce != nil {
+			ce.Write(
+				zap.Int64("inflight", inflight),
+				zap.Error(err),
+			)
+		}
 	}()
 
 	switch rc.lse.esm.load() {

internal/storagenode/logstream/sequencer.go

@@ -47,10 +47,12 @@ func (sq *sequencer) send(ctx context.Context, st *sequenceTask) (err error) {
 		if err != nil {
 			inflight = atomic.AddInt64(&sq.inflight, -1)
 		}
-		sq.logger.Debug("sent seqeuencer a task",
-			zap.Int64("inflight", inflight),
-			zap.Error(err),
-		)
+		if ce := sq.logger.Check(zap.DebugLevel, "sent seqeuencer a task"); ce != nil {
+			ce.Write(
+				zap.Int64("inflight", inflight),
+				zap.Error(err),
+			)
+		}
 	}()
 
 	switch sq.lse.esm.load() {
@@ -103,7 +105,9 @@ func (sq *sequencer) sequenceLoopInternal(ctx context.Context, st *sequenceTask)
 	for dataIdx := 0; dataIdx < len(st.awgs); dataIdx++ {
 		sq.llsn++
 		st.awgs[dataIdx].setLLSN(sq.llsn)
-		sq.logger.Debug("sequencer: issued llsn", zap.Uint64("llsn", uint64(sq.llsn)))
+		if ce := sq.logger.Check(zap.DebugLevel, "sequencer: issued llsn"); ce != nil {
+			ce.Write(zap.Uint64("llsn", uint64(sq.llsn)))
+		}
 		for replicaIdx := 0; replicaIdx < len(st.rts); replicaIdx++ {
 			// NOTE: Use "append" since the length of st.rts is not enough to use index. Its capacity is enough because it is created to be reused.
 			st.rts[replicaIdx].llsnList = append(st.rts[replicaIdx].llsnList, sq.llsn)
@@ -183,10 +187,12 @@ func (sq *sequencer) waitForDrainage(cause error, forceDrain bool) {
 	timer := time.NewTimer(tick)
 	defer timer.Stop()
 
-	sq.logger.Debug("draining sequencer tasks",
-		zap.Int64("inflight", atomic.LoadInt64(&sq.inflight)),
-		zap.Error(cause),
-	)
+	if ce := sq.logger.Check(zap.DebugLevel, "draining sequencer tasks"); ce != nil {
+		ce.Write(
+			zap.Int64("inflight", atomic.LoadInt64(&sq.inflight)),
+			zap.Error(cause),
+		)
+	}
 
 	for atomic.LoadInt64(&sq.inflight) > 0 {
 		if !forceDrain {

internal/storagenode/logstream/sync.go

@@ -504,7 +504,9 @@ func (lse *Executor) SyncReplicate(_ context.Context, srcReplica varlogpb.LogStr
 		if err != nil {
 			return err
 		}
-		lse.logger.Info("log stream: sync replicate: copy", zap.String("log entry", entry.String()))
+		if ce := lse.logger.Check(zap.DebugLevel, "log stream: sync replicate: copy"); ce != nil {
+			ce.Write(zap.String("log entry", entry.String()))
+		}
 		uncommittedLLSNBegin = entry.LLSN + 1
 		uncommittedGLSNBegin = entry.GLSN + 1
 		lem = &varlogpb.LogEntryMeta{
@@ -531,7 +533,9 @@ func (lse *Executor) SyncReplicate(_ context.Context, srcReplica varlogpb.LogStr
 		if err != nil {
 			return err
 		}
-		lse.logger.Info("log stream: sync replicate: copy", zap.String("commit context", cc.String()))
+		if ce := lse.logger.Check(zap.DebugLevel, "log stream: sync replicate: copy"); ce != nil {
+			ce.Write(zap.String("commit context", cc.String()))
+		}
 
 		ver = cc.Version
 		hwm = cc.HighWatermark

internal/storagenode/logstream/writer.go

@@ -42,10 +42,12 @@ func (w *writer) send(ctx context.Context, st *sequenceTask) (err error) {
 		if err != nil {
 			inflight = atomic.AddInt64(&w.inflight, -1)
 		}
-		w.logger.Debug("sent writer a task",
-			zap.Int64("inflight", inflight),
-			zap.Error(err),
-		)
+		if ce := w.logger.Check(zap.DebugLevel, "sent writer a task"); ce != nil {
+			ce.Write(
+				zap.Int64("inflight", inflight),
+				zap.Error(err),
+			)
+		}
 	}()
 
 	switch w.lse.esm.load() {
@@ -131,10 +133,12 @@ func (w *writer) waitForDrainage(cause error, forceDrain bool) {
 	timer := time.NewTimer(tick)
 	defer timer.Stop()
 
-	w.logger.Debug("draining writer tasks",
-		zap.Int64("inflight", atomic.LoadInt64(&w.inflight)),
-		zap.Error(cause),
-	)
+	if ce := w.logger.Check(zap.DebugLevel, "draining writer tasks"); ce != nil {
+		ce.Write(
+			zap.Int64("inflight", atomic.LoadInt64(&w.inflight)),
+			zap.Error(cause),
+		)
+	}
 
 	for atomic.LoadInt64(&w.inflight) > 0 {
 		if !forceDrain {