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| --- | ||
| title: TiDB 8.5.6 Release Notes | ||
| summary: 了解 TiDB 8.5.6 版本的兼容性变更、改进提升，以及错误修复。 | ||
| --- | ||
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| # TiDB 8.5.6 Release Notes | ||
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| 发版日期：2026 年 x 月 x 日 | ||
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| TiDB 版本：8.5.6 | ||
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| 试用链接：[快速体验](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with-tidb) | [生产部署](https://docs.pingcap.com/zh/tidb/v8.5/production-deployment-using-tiup) | [下载离线包](https://pingkai.cn/download#tidb-community) | ||
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| ## 功能详情 | ||
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| ### 稳定性 | ||
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| - 支持为资源管控的后台任务设置资源上限成为正式功能 (GA) [#56019](https://github.com/pingcap/tidb/issues/56019) @[glorv](https://github.com/glorv) | ||
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| TiDB 资源管控能够识别并降低后台任务的运行优先级。在部分场景下，即使有空闲资源，用户也希望后台任务消耗能够控制在很低的水平。从 v8.4.0 开始，你可以使用参数 `UTILIZATION_LIMIT` 为资源管控的后台任务设置最大可以使用的资源百分比，每个节点把所有后台任务的使用量控制在这个百分比以下。该功能可以让你精细控制后台任务的资源占用，进一步提升集群稳定性。 | ||
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| 在 v8.5.6 中，该功能成为正式功能 (GA)。 | ||
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| 更多信息，请参考[用户文档](/tidb-resource-control-background-tasks.md)。 | ||
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| ### 数据迁移 | ||
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| - (dup): release-9.0.0.md > # 数据迁移 * 将 sync-diff-inspector 从 `pingcap/tidb-tools` 迁移至 `pingcap/tiflow` 代码仓库 [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) | ||
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| ## 兼容性变更 | ||
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| - note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| ## 改进提升 | ||
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| + TiDB | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiKV | ||
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| - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| - (dup): release-8.5.4.md > 改进提升> TiKV - 优化 gRPC 线程池线程数量默认值的计算方式，将原固定值调整为根据总的 CPU 配置动态计算，避免因 gRPC 线程数量过小导致的性能瓶颈 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) | ||
| - (dup): release-8.5.5.md > 改进提升> TiKV - 在 TiKV 内存占用高时，对 BR 的日志恢复请求进行限流，防止 TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) | ||
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| + PD | ||
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| - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| - (dup): release-8.5.5.md > 改进提升> PD - 优化了高基数指标，降低 PD 的内存占用和监控系统压力 [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) | ||
| - (dup): release-7.5.7.md > 改进提升> PD - 减少非必要的错误日志 [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) | ||
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| + TiFlash | ||
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| - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiCDC | ||
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| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiDB Data Migration (DM) | ||
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| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiDB Lightning | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + Dumpling | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiUP | ||
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| - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| ## 错误修复 | ||
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| + TiDB | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiKV | ||
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| - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| - (dup): release-5.1.4.md > Bug 修复> TiKV - 修复悲观事务中 prewrite 请求重试在极少数情况下影响数据一致性的风险 [#11187](https://github.com/tikv/tikv/issues/11187) | ||
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| + PD | ||
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hfxsd marked this conversation as resolved.
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| - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| - (dup): release-8.5.4.md > 错误修复> PD - 修复 Resource Manager 错误分配 token 导致查询卡住的问题 [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) | ||
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| + TiFlash | ||
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| - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| - (dup): release-8.5.5.md > 错误修复> Tools> Backup & Restore (BR) - 修复集群中存在大量 Region 时，开启日志备份导致内存占用过高的问题 [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) | ||
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| + TiCDC | ||
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| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + TiDB Data Migration (DM) | ||
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| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| + TiDB Lightning | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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| + Dumpling | ||
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| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
hfxsd marked this conversation as resolved.
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| + TiUP | ||
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| - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
| - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) | ||
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