From 6fffb61bc183faa26a5357f352d11308f5691b16 Mon Sep 17 00:00:00 2001
From: Martin Holst Swende <martin@swende.se>
Date: Tue, 18 Jun 2019 13:55:35 +0200
Subject: [PATCH] miner: don't update pending state when no transactions are
 added

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

diff --git a/miner/worker.go b/miner/worker.go
index 64ac21ccd3..c4b5cbc625 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -463,8 +463,13 @@ func (w *worker) mainLoop() {
 					txs[acc] = append(txs[acc], tx)
 				}
 				txset := types.NewTransactionsByPriceAndNonce(w.current.signer, txs)
+				tcount := w.current.tcount
 				w.commitTransactions(txset, coinbase, nil)
-				w.updateSnapshot()
+				// Only update the snapshot if any new transactons were added
+				// to the pending block
+				if tcount != w.current.tcount {
+					w.updateSnapshot()
+				}
 			} else {
 				// If clique is running in dev mode(period is 0), disable
 				// advance sealing here.