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README
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Kunlun-storage originated from percona-mysql-8.0.18-9, and it contains fixes to all known XA bugs in mysql-8.0.18-9. Without such fixes, Kunlun DDC will not be crash safe and may lose committed transactions or be harmed by other serious data consistency errors, in the event of various hardware/software/network failures.

Kunlun-storage also contains features required by the computing node program of Kunlun distributed DBMS, and thus Kunlun Distributed Database Cluster(DDC) requires the use of Kunlun-storage as meta data cluster and storage shards. Finally, we enhanced performance of XA transaction processing, and part of such enhancements are also in this open source edition.

To achieve all above, we modified percona-mysql extensively --- including innodb, binlog recovery, binlog format, etc. Consequently, kunlun-storage's innodb data file format and some binlog events format are different from community MySQL-8.0.x or percona-server-8.0.x, the data directory of kunlun-storage can not be used by community MySQL-8.0.x or percona-server-8.0.x, and vice versa. But percona xtrabackup can correctly backup a kunlun-storage data directory and restore it.

We also maintain an enterprise edition of Kunlun distributed DBMS, which contains exclusively all performance enhancements in kunlun-storage and kunlun computing node software. Kunlun enterprise edition has identical functionality as this open source version. And they share the same data file format, WAL(redo) log file format, binlog events format, general log format, slow query log format, mysqld log format, and config file content. They also share the same metadata table format in both kunlun-storage and kunlun computing node. Consequently, the data directory of kunlun open source edition and kunlun enterprise edition can be used interchangably.

To install Kunlun-storage database instances, see INSTALL.kunlun.md for instructions.


Percona Server 8.0
------------------

Percona Server is a branch of MySQL 8.0 bringing higher performance,
reliability and more features.

http://www.percona.com/software/percona-server/

Documentation: http://www.percona.com/doc/percona-server/8.0

Bug Tracker: https://jira.percona.com/projects/PS

Sources: https://github.com/percona/percona-server
Portions of this software contain modifications contributed by Venu Anuganti. These contributions are used with the following license: Copyright (c) 2010, Venu Anuganti, http://venublog.com/ All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the <ORGANIZATION> nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

简介

昆仑数据库的存储节点。基于percona-mysql-8.0.18-9 开发,修复了mysql-8.0 XA事务容灾的所有缺陷和漏洞,并且包含昆仑数据库计算节点所需要的功能。 昆仑数据库必须使用kunlun-storage作为存储节点。 展开 收起
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