Update writer.go

Author: Delta-Kronecker

src/writer.go

@@ -1867,11 +1867,11 @@ func countBatchFiles(dir string) int {
 }
 
 func min500(batchIdx, total int) int {
-	start := (batchIdx - 1) * 1000
+	start := (batchIdx - 1) * 333
 	if start >= total {
 		return 0
 	}
-	end := start + 1000
+	end := start + 333
 	if end > total {
 		return total - start
 	}