From 48c7ddc2e9f07200af35fd9493d600f1b22aed46 Mon Sep 17 00:00:00 2001
From: manxiaqu <1847234666@qq.com>
Date: Thu, 13 Sep 2018 09:56:28 +0800
Subject: [PATCH] miner: diff log level for miner and normal node.

---
 miner/worker.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/miner/worker.go b/miner/worker.go
index 3500ca4c23..10aaa08a13 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -831,7 +831,12 @@ func (w *worker) commitNewWork(interrupt *int32, noempty bool, timestamp int64)
 		header.Coinbase = w.coinbase
 	}
 	if err := w.engine.Prepare(w.chain, header); err != nil {
-		log.Error("Failed to prepare header for mining", "err", err)
+		if w.isRunning() {
+			log.Error("Failed to prepare header for mining", "err", err)
+		} else {
+			log.Trace("Failed to prepare header for mining", "err", err)
+		}
+		
 		return
 	}
 	// If we are care about TheDAO hard-fork check whether to override the extra-data or not