Init last commit cache

core/blockchain.go

@@ -65,6 +65,7 @@ const (
 	badBlockLimit       = 10
 	triesInMemory       = 128
 	shardCacheLimit     = 2
+	commitsCacheLimit   = 10
 	epochCacheLimit     = 10
 
 	// BlocksPerEpoch is the number of blocks in one epoch
@@ -168,6 +169,7 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 	futureBlocks, _ := lru.New(maxFutureBlocks)
 	badBlocks, _ := lru.New(badBlockLimit)
 	shardCache, _ := lru.New(shardCacheLimit)
+	commitsCache, _ := lru.New(commitsCacheLimit)
 	epochCache, _ := lru.New(epochCacheLimit)
 
 	bc := &BlockChain{
@@ -184,6 +186,7 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 		blockCache:       blockCache,
 		futureBlocks:     futureBlocks,
 		shardStateCache:  shardCache,
+		lastCommitsCache: commitsCache,
 		epochCache:       epochCache,
 		engine:           engine,
 		vmConfig:         vmConfig,