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add error log for open log file

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This commit is contained in:
Andy Xie 2017-01-06 10:52:03 +08:00
parent ba33b5a25b
commit 2c1d001857
1 changed files with 5 additions and 1 deletions
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6
utils/tail/tail.go
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@ -93,6 +93,7 @@ func (t *Tail) attemptOpen() error {
defer t.readerLock.Unlock() defer t.readerLock.Unlock()
t.readerErr = nil t.readerErr = nil
attempt := 0 attempt := 0
var lastErr error
for interval := defaultRetryInterval; ; interval *= 2 { for interval := defaultRetryInterval; ; interval *= 2 {
attempt++ attempt++
glog.V(4).Infof("Opening %s (attempt %d)", t.filename, attempt) glog.V(4).Infof("Opening %s (attempt %d)", t.filename, attempt)
@ -104,6 +105,9 @@ func (t *Tail) attemptOpen() error {
t.reader = bufio.NewReader(t.file) t.reader = bufio.NewReader(t.file)
return nil return nil
} }
lastErr = err
glog.V(4).Infof("open log file %s error: %v", t.filename, err)
if interval >= maxRetryInterval { if interval >= maxRetryInterval {
break break
} }
@ -114,7 +118,7 @@ func (t *Tail) attemptOpen() error {
return fmt.Errorf("watch was cancelled") return fmt.Errorf("watch was cancelled")
} }
} }
err := fmt.Errorf("can't open log file %s", t.filename) err := fmt.Errorf("can't open log file %s: %v", t.filename, lastErr)
t.readerErr = err t.readerErr = err
return err return err
} }