hbase write flow(byte level)

  here is a byte flow of mutation

level	format	usage
top(abstract,user facing)	[Put,Put…]	HTable#put(list)
encapsulation	[HLogKey, WALEdit] WALEdit: kv1, kv2  ||  v [totallen,keylen,key,val]	HLog, WALEdit
even io	[Packet,Packet..] Packet:chunk1,chunk2..	DFSClient#DFSOutputStream
lowest(fs,wal)	[Block,Block..] Block:[byte,byte,…]	RandomAccessFile(‘rw’)