flush implicit writes at the right time before starting compaction to avoid races

blockstore/splitstore/splitstore.go

@@ -879,7 +879,6 @@ func (s *SplitStore) compact(curTs *types.TipSet) {
 		log.Infow("current mark set size estimate", "size", s.markSetSize)
 	}
 
-	s.flushImplicitWrites(false)
 	start := time.Now()
 	err = s.doCompact(curTs)
 	took := time.Since(start).Milliseconds()
@@ -939,6 +938,8 @@ func (s *SplitStore) doCompact(curTs *types.TipSet) error {
 
 	defer s.debug.Flush()
 
+	s.flushImplicitWrites(false)
+
 	// 1. mark reachable objects by walking the chain from the current epoch to the boundary epoch
 	log.Infow("marking reachable blocks", "currentEpoch", currentEpoch, "boundaryEpoch", boundaryEpoch)
 	startMark := time.Now()