Percona XtraDB Cluster 5.6.20-25.7 发布

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发布于 2014年09月02日
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Percona XtraDB Cluster 5.6.20-25.7 发布,此版本现已提供下载,并提供在 software repositories

此版本是基于 Percona Server 5.6.20-68.0 并包括了其所有的 bug 修复;同时也基于 Galera Replicator 3.7Codership wsrep API 25.7。Percona XtraDB Cluster 5.6.20-25.7 是当前的 GA 版本。

新特性:

  • New session variable wsrep_sync_wait has been implemented to control causality check. The old session variable wsrep_causal_reads is deprecated but is kept for backward compatibility (#1277053).

  • systemd integration with RHEL/CentOS 7 is now available for Percona XtraDB Cluster from our testing repository (#1342223).

Bugs 修复:

  • Running START TRANSACTION WITH CONSISTENT SNAPSHOT, mysqldump with --single-transaction or mydumper with disabled binlog would lead to a server crash. Bug fixed #1353644.

  • percona-xtradb-cluster-garbd-3.x package was installed incorrectly on Debian/Ubuntu. Bug fixed #1360633.

  • Fixed netcat in SST script for CentOS 7 nmap-ncat. Bug fixed #1359767.

  • TO isolation was run even when wsrep plugin was not loaded. Bug fixed #1358681.

  • The error from net read was not handled in native MySQL mode. This would cause duplicate key error if there was unfinished transaction at the time of shutdown, because it would be committed during the startup recovery. Bug fixed #1358264.

  • The netcat in garbd init script has been replaced with nmap for compatibility in CentOS 7. Bug fixed #1349384.

  • SHOW STATUS was generating debug output in the error log. Bug fixed #1347818.

  • Incorrect source string length could lead to server crash. This fix allows maximum of 3500 bytes of key material to be populated, longer keys will be truncated. Bug fixed #1347768.

  • wsrep consistency check is now enabled for REPLACE ... SELECT as well. This was implemented because pt-table-checksum uses REPLACE .. SELECT during checksumming. Bug fixed #1343209.

  • Client connections were closed unconditionally before generating SST request. Fixed by avoiding closing connections when wsrep is initialized before storage engines. Bug fixed #1258658.

  • Session-level binlog_format change to STATEMENT is now allowed to support pt-table-checksum. A warning (to not use it otherwise) is also added to error log.

其他 bug 修复: #1280270.

更多内容请看online documentation

Percona XtraDB Cluster是针对MySQL用户的高可用性和扩展性解决方案,基于Percona Server 。其包括了Write Set REPlication补丁,使用Galera 2.0库,这是一个针对事务性应用程序的同步多主机复制插件。

Percona Server是MySQL的改进版本,使用 XtraDB 存储引擎,在功能和性能上较 MySQL 有着很显著的提升,如提升了在高负载情况下的 InnoDB 的性能,为 DBA 提供了一些非常有用的性能诊断工具,另外有更多的参数和命令来控制服务器行为。

Percona XtraDB Cluster提供了:

  • 同步复制,事务可以在所有节点上提交。

  • 多主机复制,你可以写到任何节点。

  • 从(slave)服务器上的并行应用事件,真正的“并行复制”。

  • 自动节点配置。

  • 数据一致性,不再有未同步的从服务器。

Percona XtraDB Cluster完全兼容MySQL或Percona Server,包括:

  • 数据兼容。Percona XtraDB Cluster可在由MySQL或Percona Server创建的数据库上使用。

  • 应用程序兼容。如果要使用Percona XtraDB Cluster,你的应用程序基本不需要作任何更改。

此次发布的Percona XtraDB Cluster为alpha版本,不建议在实际工作中使用,开发者可据此了解Percona XtraDB Cluster的特性和功能。


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