Patent AU-2019203865-A1 (AU)
Title: Consensus system downtime recovery
Inventor: YANG DAYI
IPC: G06F11/14
Filed: 2019-03-18
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) 
(19) World Intellectual Property 
(1) Organization11111111111111111111111I1111111111111i1111liiiii 
International Bureau (10) International Publication Number 
(43) International Publication Date W O 2019/101245 A2 
31 May 2019 (31.05.2019) W IPO I PCT 
(51) International Patent Classification: HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, 
Not classified KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, 
(21) International Application Number: MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, 
PCT/CN2019/078552 OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 
SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, 
(22) International Filing Date: TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.  
18 March 2019 (18.03.2019) (84) Designated States (unless otherwise indicated, for every 
(25) Filing Language: English kind of regional protection available): ARIPO (BW, GH, 
GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, 
(26)PublicationLanguage: English UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, 
(71) Applicant: ALIBABA GROUP HOLDING LIMITED TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 
[-/CN]; Fourth Floor, One Capital Place, P.O. BOX 847, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, 
George Town, Grand Cayman (KY). MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, 
(72) Inventor: YANG, Dayi; Alibaba Group Legal Department TR), OAPI (BF, BJ, , C , CGCM,GA,GN,GQGW, 
5/F, Building 3, No.969 West Wen Yi Road, YuHang Dis- RM,ML,MR,NE,SN,TD,TG).  
trict, Hangzhou, Zhejiang 311121 (CN). Published: 
(74) Agent: BEIJING BESTIPR INTELLECTUAL PROP- - upon request of the applicant, before the expiration of the 
ERTY LAW CORPORATION; Room 409, Tower B, Ka time limit referred to in Article 2](2)(a) 
Wah Building, No. 9 Shangdi 3rd Street, Haidian District, - without international search report and to be republished 
Beijing 100085 (CN). upon receipt ofthat report (Rule 48.2(g)) 
(81) Designated States (unless otherwise indicated, for every 
kind of national protection available): AE, AG, AL, AM, 
AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, 
CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, 
DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, 
(54) Title: CONSENSUS SYSTEM DOWNTIME RECOVERY 
(57) Abstract: Methods, systems, and apparatus, including comput
120 er programs encoded on computer storage media, for consensus sys
tem downtime recovery. One of the methods includes: obtaining a 
pre-prepare message from the primary node; multicasting a prepare 
User A User B message indicating an acceptance of the pre-prepare message to at 
least some of the primary node and the other (N-2) backup nodes; 
Off-blockchain obtaining (Q-1) or more prepare messages respectively from (Q-1) 
communication or more of the backup nodes; storing the pre-prepare message and 
the (Q-1) ormore prepare messages; multicastinga commitmessage 
N- e A Node B to at least some of the primary node and the other backup nodes, the 
commit message indicating that the one backup node agrees to the 
Nodes in a network system 112 (Q-1) or more prepare messages; and obtaining, respectively from 
Q or more nodes among the primary node and the backup nodes, 
Q or more commit messages each indicating that the corresponding 
node agrees to (Q-1) or more prepare messages.  
oI.0 
0 FIG. 1