3.Redis 6.0-rc3 更新日志
Dear users, this is a list of the major changes in this release, please check the list of commits for detail:
- Fix crash due to refactoring for SSL, for the connection code.
- Precise timeouts for blocking commands. Now the timeouts have HZ resolution regardless of the number of connected clinets. New timeouts are stored in a radix tree and sorted by expire time.
- Fix rare crash when resizing the event loop because of CONFIG maxclients.
- Fix systemd readiness after successful partial resync.
- Redis-cli ask password mode to be prompted at startup (for additional safety).
- Keyspace notifications added to MIGRATE / RESTORE.
- Threaded I/O bugs fixed.
- Implement new ACL style AUTH in Sentinel.
- Make 'requirepass' more backward compatible with Redis <= 5.
- ACL: Handle default user as disabled if it's off regardless of "nopass".
- Fix a potential inconsistency when upgrading an instance in Redis Cluster and restarting it. The instance will act as a replica but will actually be set as a master immediately. However the choice of what to do with already expired keys, on loading, was made from the POV of replicas.
- Abort transactions after -READONLY error.
- Many different fixes to module APIs.
- BITFIELD_RO added to call the command on read only replicas.
- PSYNC2: meaningful offset implementation. Allow the disconnected master that is still sending PINGs to replicas, to be able to successfully PSYNC incrementally to new slaves, discarding the last part of the replication backlog consisting only of PINGs.
- Fix pipelined MULTI/EXEC during Lua scripts are in BUSY state.
- Re-fix propagation API in modules, broken again after other changes.
这个版本主要是修复了一些 bug，如下列表所示：
- 修复了由于重构 SSL 而导致的连接代码崩溃。
- 用于阻止命令的精确超时。现在超时已达到 HZ 分辨率，无论连接的 clinet 数量如何。新超时存储在基数树中并按到期时间排序。
- 修复了由于 CONFIG maxclients 而调整事件循环大小时发生的罕见崩溃。
- 修正部分重新同步成功后的 systemd 准备情况。
- Redis-cli 询问密码模式将在启动时提示（以提高安全性）。
- 键空间通知已添加到 MIGRATE/RESTORE。
- 修复了线程 I/O 错误。
- 在 Sentinel 中实现新的 ACL 样式 AUTH。
- 使 'requirepass' 与 Redis<=5 更向后兼容。
- ACL：如果默认用户关闭，则将其视为禁用状态，而不管其是否为“ nopass”。
- 修复了在 Redis 群集中升级实例时可能出现的不一致问题
- -READONLY 错误后中止事务。
- 对模块 API 的许多不同修复。
- 添加了 BITFIELD_RO 以在只读副本上调用该命令。
- PSYNC2：有意义的偏移量实现。允许断开连接的主机仍在向副本发送 PING，以便能够成功 PSYNC 以增量方式传递给新的从站，从而丢弃了仅由 PING 组成的复制积压。
- 修正 Lua 脚本处于繁忙状态时流水线的 MULTI/EXEC。
- 重新修复模块中的传播 API，在其他更改后再次中断。
4.Redis 6.0-rc4 更新日志
Hi all, this the latest release candidate of Redis 6. This is likely to be very similar to what you'll see in Redis 6 GA. Please test it and report any issue :-)
Main changes in this release:
* Big INFO speedup when using a lot of of clients. * Big speedup on all the blocking commands: now blocking on the same key is O(1) instead of being O(N). * Stale replicas now allow MULTI/EXEC. * New command: LCS (Longest Common Subsequence). * Add a new configuration to make DEL like UNLINK. * RDB loading speedup. * Many bugs fixed (see the commit messages at the end of this node)
此版本主要新增的内容如下：
- 提高了大量客户端连接时使用 INFO 命令的查询速度。
- 在所有阻止命令上都大大加快了速度：现在可以阻止在同一键上是 O（1）而不是 O（N）。
- 陈旧的副本现在允许 MULTI/EXEC。
- 新命令：LCS（最长公共子序列）。
- 添加新配置以使 DEL 像 UNLINK。
- RDB 加载加速。
- 修复了许多错误。
5.Redis 6.0.0 GA 更新日志
Upgrade urgency CRITICAL: many bugs fixed compared to the last release candidate. Better to upgrade if you see things affecting your environment in the changelog.
Hi all, finally we have Redis 6.0.0 GA! Enjoy this new Redis release. Most of the documentation was updated today so that you can likely find what you are looking for about the new features at redis.io. This is the list of what changed compared to the previoius release candidate:
- XCLAIM AOF/replicas propagation fixed.
- Client side caching: new NOLOOP option to avoid getting notified about changes performed by ourselves.
- ACL GENPASS now uses HMAC-SHA256 and have an optional "bits" argument. It means you can use it as a general purpose "secure random strings" primitive!
- Cluster "SLOTS" subcommand memory optimization.
- The LCS command is now a subcommand of STRALGO.
- Meaningful offset for replicas as well. More successful partial resynchronizations.
- Optimize memory usage of deferred replies.
- Faster CRC64 algorithm for faster RDB loading.
- XINFO STREAM FULL, a new subcommand to get the whole stream state.
- CLIENT KILL USER.
- MIGRATE AUTH2 option, for ACL style authentication support.
- Other random bugfixes.
此日志更新的主要内容如下：
- XCLAIM AOF/replicas 传播已修复。
- 客户端缓存：新的 NOLOOP 选项以避免收到有关自己执行的更改。
- ACL GENPASS 现在使用 HMAC-SHA256，并具有一个可选的“位”参数。这意味着您可以将其用作通用的“安全随机字符串”原始！
- 群集“SLOTS”子命令的内存优化。
- LCS 命令现在是 STRALGO 的子命令。
- 副本的有意义的偏移量。更成功的部分重新同步。
- 优化延迟回复的内存使用。
- 更快的 CRC64 法可更快地加载 RDB。
- XINFO STREAM FULL，一个新的子命令，用于获取整个流状态。
- CLIENT KILL USER <用户名>。
- MIGRATE AUTH2 选项，用于 ACL 样式身份验证支持。
- 修正了一些其他错误。
Redis 6.0.1 正式版的下载地址为：https://redis.io/
官方的更新日志（英文）：https://raw.githubusercontent.com/antirez/redis/6.0/00-RELEASENOTES
总结
综合以上所有版本的更新日志，我们发现这次 Redis 6.0 带来的主要功能是：
- 提供了众多的新模块（modules）API
- 提供了客户端缓存功能
- 多线程 I/O 能力
- 提升了 RDB 日志的加载速度
- 修改了若干个 bug 和一些优化
其中多线程 I/O 是我们最关注的功能了，有人用它和单线程的版本做了一个性能测试，如下图所示：
从以上结果可以看到 GET/SET 命令在多线程版本中的性能相比单线程已经翻倍了。
总体来说，此次 Redis 6.0 带给我们的功能还是很多且比较实用的，只是版本改动很大，因此我们需要一定的时间和大量的测试验证之后才建议上线。
