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tsdb: clean up Watcher debug messages

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Print lastSegment after it gets initialized.

Move variable declaration to first use.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-02-22 09:19:18 +00:00
parent 78f46bccca
commit a975a83079
1 changed files with 3 additions and 6 deletions
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9
tsdb/wlog/watcher.go
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@ -262,9 +262,6 @@ func (w *Watcher) loop() {
// Run the watcher, which will tail the WAL until the quit channel is closed
// or an error case is hit.
func (w *Watcher) Run() error {
var lastSegment int
var err error
// We want to ensure this is false across iterations since
// Run will be called again if there was a failure to read the WAL.
w.sendSamples = false
@ -289,19 +286,19 @@ func (w *Watcher) Run() error {
return err
}
level.Debug(w.logger).Log("msg", "Tailing WAL", "lastCheckpoint", lastCheckpoint, "checkpointIndex", checkpointIndex, "currentSegment", currentSegment, "lastSegment", lastSegment)
level.Debug(w.logger).Log("msg", "Tailing WAL", "lastCheckpoint", lastCheckpoint, "checkpointIndex", checkpointIndex, "currentSegment", currentSegment)
for !isClosed(w.quit) {
w.currentSegmentMetric.Set(float64(currentSegment))
level.Debug(w.logger).Log("msg", "Processing segment", "currentSegment", currentSegment)
// Reset the value of lastSegment each iteration, this is to avoid having to wait too long for
// between reads if we're reading a segment that is not the most recent segment after startup.
_, lastSegment, err = w.firstAndLast()
_, lastSegment, err := w.firstAndLast()
if err != nil {
return fmt.Errorf("wal.Segments: %w", err)
}
tail := currentSegment >= lastSegment
level.Debug(w.logger).Log("msg", "Processing segment", "currentSegment", currentSegment, "lastSegment", lastSegment)
// On start, after reading the existing WAL for series records, we have a pointer to what is the latest segment.
// On subsequent calls to this function, currentSegment will have been incremented and we should open that segment.
if err := w.watch(currentSegment, tail); err != nil && !errors.Is(err, ErrIgnorable) {