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Merge pull request #733 from lilin90/release-201
releases: add the release notes for TiDB 2.0.1
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title: TiDB 2.0.1 release notes | ||
category: Releases | ||
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# TiDB 2.0.1 Release Notes | ||
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2018 年 5 月 16 日,TiDB 发布 2.0.1 版。该版本在 2.0.0 (GA) 版的基础上,对 MySQL 兼容性、系统稳定性做出了改进。 | ||
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## TiDB | ||
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- 实时更新 `Add Index` 的进度到 DDL 任务信息中 | ||
- 添加 Session 变量 `tidb_auto_analyze_ratio` 控制统计信息自动更新阈值 | ||
- 修复当事务提交失败时可能未清理所有的残留状态的问题 | ||
- 修复加索引在部分情况下的 Bug | ||
- 修复 DDL 修改表面操作在某些并发场景下的正确性问题 | ||
- 修复某些情况下 `LIMIT` 结果不正确的问题 | ||
- 修复 `ADMIN CHECK INDEX` 语句索引名字区分大小写问题 | ||
- 修复 `UNION` 语句的兼容性问题 | ||
- 修复插入 `TIME` 类型数据的兼容性问题 | ||
- 修复某些情况下 `copIteratorTaskSender` 导致的 goroutine 泄漏问题 | ||
- 增加一个选项,用于设置 TiDB 在写 Binlog 失败的情况下的行为 | ||
- 优化 Coprocessor 慢请求日志格式,区分处理时间长与排队时间长的任务 | ||
- MySQL 协议握手阶段发生错误不打印日志,避免 KeepAlive 造成大量日志 | ||
- 优化 `Out of range value for column` 的错误信息 | ||
- 修复 `Update` 语句中遇到子查询导致结果错误的问题 | ||
- 调整 TiDB 进程处理 `SIGTERM` 的行为,不等待正在执行的 Query 完成 | ||
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# PD | ||
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- 添加 `Scatter Range` 调度,调度指定 Key Range 包含的 Region | ||
- 优化 `Merge Region` 调度,使新分裂不久的 Region 不能被合并 | ||
- 添加 learner 相关的 metrics | ||
- 修复重启误删 scheduler 的问题 | ||
- 修复解析配置文件出错问题 | ||
- 修复 etcd leader 和 PD leader 不同步的问题 | ||
- 修复关闭 learner 情况下还有 learner 出现的问题 | ||
- 修复读取包过大造成 load Regions 失败的问题 | ||
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## TiKV | ||
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- 修复 `SELECT FOR UPDATE` 阻止其他人读的问题 | ||
- 优化慢查询的日志 | ||
- 减少 `thread_yield` 的调用次数 | ||
- 修复生成 snapshot 会意外阻塞 raftstore 的 bug | ||
- 修复特殊情况下开启 learner 无法选举成功的问题 | ||
- 修复极端情况下分裂可能导致的脏读问题 | ||
- 修正读线程池的配置默认值 | ||
- 修正删大数据表会影响写性能的问题 |
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