log on empty head compaction result (#8037)

Signed-off-by: frbimo <fr.bimo@gmail.com>
2020-10-14 21:29:59 +08:00 · 2020-10-14 21:29:59 +08:00 · 260cd84d8f
parent 73e2ce1bd6
commit 260cd84d8f
1 changed files with 6 additions and 0 deletions
--- a/tsdb/compact.go
+++ b/tsdb/compact.go
@ -488,6 +488,12 @@ func (c *LeveledCompactor) Write(dest string, b BlockReader, mint, maxt int64, p
 	}

 	if meta.Stats.NumSamples == 0 {
+		level.Info(c.logger).Log(
+			"msg", "write block resulted in empty block",
+			"mint", meta.MinTime,
+			"maxt", meta.MaxTime,
+			"duration", time.Since(start),
+		)
 		return ulid.ULID{}, nil
 	}