加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
克隆/下载
贡献代码
同步代码
取消
提示: 由于 Git 不支持空文件夾,创建文件夹后会生成空的 .keep 文件
Loading...
README
Apache-2.0
BFT-SMaRt v1.1-beta
----------

This package contains the BFT-SMaRt source code (src/), binary file (bin/), libraries needed (lib/), documentation (doc/), running scripts (runscripts/) and configuration files (config/).
BFT-SMaRt requires the Java Runtime Environment version 1.7 or later.

---------------- Important warning ------------------------

This beta version of BFT-SMaRt offers the most stable execution via the class bftsmart.tom.server.defaultservices.DefaultRecoverable under Byzantine faults. Applications can also be implemented using 'bftsmart.tom.server.defaultservices.DefaultSingleRecoverable' and 'bftsmart.tom.server.defaultservices.durability.DurabilityCoordinator', but they are not as stable as 'DefaultRecoverable'. In future versions these classes will be properly tested and fixed.

------------- How to run BFT-SMaRt -----------------------

To run any demonstration you first need to configure BFT-SMaRt to define the protocol behavior and the location of each replica.

1.) The servers must be specified in the configuration file (see 'config/hosts.config'). An example:

#server id, address and port (the ids from 0 to n-1 are the service replicas) 
0 127.0.0.1 11000
1 127.0.0.1 11010
2 127.0.0.1 11020
3 127.0.0.1 11030

Important tip #1: Always provide IP addresses instead of hostnames. If a machine running a replica is not correctly configured, BFT-SMaRt may fail to obtain the proper IP address and use the loopback address instead (127.0.0.1). This phenomenom may prevent clients and/or replicas from successfully establishing a connection among them.

Important tip #2: If some (or all) replicas are deployed/executed within the same machine (127.0.0.1), 'config/hosts.config' cannot have sequencial port numbers (e.g., 10000, 10001, 10002, 10003). This is because each replica binds two ports: one to receive messages from clients (that are configured in 'config/hosts.config', as shown above) and other to receive message from the other replicas (chosen by getting the next port number). More generally, if replica R is assigned port number P, it will try to bind ports P (to received client requests) and P+1 (to communicate with other replicas). If this guideline is not enforced, replicas may not be able to bind all ports that are needed.

Important tip #3: Clients requests should not be issued before all replicas have been properly initialized. Replicas are ready to process client requests when each one outputs '(DeliveryThread.run) canDeliver released.' in the console.

2.) The system configurations also have to be specified (see 'config/system.config'). Most of the parameters are self explanatory.

You can run the counter demonstration by executing the following commands, from within the main folder:

#Start the servers (4 replicas, to tolerate 1 fault)
./runscripts/smartrun.sh bftsmart.demo.counter.CounterServer 0
./runscripts/smartrun.sh bftsmart.demo.counter.CounterServer 1
./runscripts/smartrun.sh bftsmart.demo.counter.CounterServer 2
./runscripts/smartrun.sh bftsmart.demo.counter.CounterServer 3

Important tip #4: If you are getting timeout messages, it is possible that the application you are running takes too long to process the requests or the network delay is too high and PROPOSE messages from the leader don't arrive in time, so replicas may start the leader change protocol. To prevent that, try to increase the 'system.totalordermulticast.timeout' parameter in 'config/system.config'.

Important tip #5: Never forget to delete the 'config/currentView' file after you modify 'config/hosts.config' or 'config/system.config'. If 'config/currentView' exists, BFT-SMaRt always fetches the group configuration from this file first. Otherwise, BFT-SMaRt fetches information from the other files and creates 'config/currentView' from scratch. Note that 'config/currentView' only stores information related to the group of replicas. You do not need to delete this file if, for instance, you want to enable the debugger or change the value of the request timeout.

#Start a client

./runscripts/smartrun.sh bftsmart.demo.counter.CounterClient 1001 <increment> [<number of operations>]

If <increment> equals 0 the request will be read-only. Default <number of operations> equals 1000.

Important tip #6: always make sure that each client uses a unique ID. Otherwise, clients may not be able to complete their operations.

You can use the './runscripts/runsmart.bat'" script in Windows, and the './runscripts/runsmart.sh' script in Linux.
When running the script in Linux it is necessary to set the permissions to execute the script with the command 'chmod +x ./runscripts/runsmart.sh'.

These scripts can easily be adapted to execute other demos, such as:

- Random. You can run it by using the 'RandomServer' and 'RandomClient' classes located in the package 'bftsmart.demo.random'.
- BFTMap. A Table of hash maps where tables can be created and key value pair added to it.
  The server is 'bftmap.demo.bftmap.BFTMapServer' and the clients are 'BFTMapClient' for incremental inserts or 'BFTMapInteractiveClient' for a command line client. Parameters to run the BFTMap demo are displayed when attempts to start the servers and clients are made without parameters.
- YCSB. You can run a Yahoo! Cloud Serving Benchmark with BFT-SMaRt by executing the './runscripts/startReplicaYCSB.sh' and './runscripts/ycsbClient.sh' scripts.
  
---------- State transfer protocol(s) --------------

BFT-SMaRt offers two state transfer protocols. The first is a basic protocol that can be used by extending the class 'bftsmart.tom.server.defaultservices.DefaultRecoverable' that logs requests into memory and periodically takes snapshots of the application state.

The second, more advanced protocol can be used by extending the class 'bftsmart.tom.server.defaultservices.durability.DurabilityCoordinator'. This protocol stores its logs to disk. To mitigate the latency of writing to disk, such tasks is done in batches and in parallel with the requests' execution. Additionally, the snapshots are taken at different points of the execution in different replicas.

Important tip #7: regardless of the chosen protocol, developers must avoid using Java API objects like 'HashSet' or 'HashMap', and use 'TreeSet' or 'TreeMap' instead. This is because serialization of Hash* objects is not deterministic, i.e, it generates different results for equal objects. This will lead to problems after more than 'f' replicas used the state transfer protocol to recover from failures.

----------- Group reconfiguration ------------------

The library also implements a reconfiguration protocol that can be used to add/remove replicas from the initial group. You can add/remove replicas on-the-fly by executing the following commands:

./runscripts/smartrun.sh bftsmart.reconfiguration.VMServices <smart id> <ip address> <port> (to add a replica to the group)
./runscripts/smartrun.sh bftsmart.reconfiguration.VMServices <smart id> (to remove a replica from the group)

Important tip #8: everytime you use the reconfiguration protocol, you must make sure that all replicas and the host where you invoke the above commands have the latest 'config/currentView' file. The current implementation of BFT-SMaRt does not provide any mechanism to distribute this file, so you will need to distribute it on your own (e.g., using the 'scp' command). You also need to make sure that any client that starts executing can read from the latest config/currentView file.

---------- BFT-SMaRt under crash faults ------------

You can run BFT-SMaRt in crash-faults only mode by setting the 'system.bft' parameter in the configuration file to 'false'. This mode requires less replicas to execute, but will not withstand full Byzantine behavior from compromised replicas.

------ Generating public/private key pairs ---------

If you need to generate public/private keys for more replicas or clients, you can use the following command:

./runscripts/smartrun.sh bftsmart.tom.util.RSAKeyPairGenerator <id> <key size>

Keys are stored in the 'config/keys' folder. The command above creates key pairs both for clients and replicas. Alternatively, you can set the 'system.communication.defaultkeys' to 'true' in the 'config/system.config' file to forces all processes to use the same public/private keys pair and secret key. This is useful when deploying experiments and benchmarks, because it enables the programmer to avoid generating keys for all principals involved in the system. However, this must not be used in a real deployment.

----- Additional information and publications ------

Finally, if you are interested in learning more about BFT-SMaRt, you can read:

- The technical report at the handler: http://hdl.handle.net/10451/14170
- The paper about its state machine protocol published in EDCC'12: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6214759
- The paper about its advanced state transfer protocol published in Usenix'13: https://www.usenix.org/conference/atc13/technical-sessions/presentation/bessani
- The tool description published in DSN'14: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6903593&tag=1

Feel free to contact us if you have any questions!
Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "{}" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright {yyyy} {name of copyright owner} Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

简介

京东区块链 JD Chain 项目的 BFT 共识算法的代码仓库,包括了 BFT 共识算法的完整实现,包括一致性、选举、视图管理、状态复制、通讯网络等,代码结构被设计为独立代码库。 展开 收起
Apache-2.0
取消

发行版

暂无发行版

贡献者

全部

近期动态

加载更多
不能加载更多了
马建仓 AI 助手
尝试更多
代码解读
代码找茬
代码优化