frequently due to the Congest error #11082 – Fix the issue that the Raft connection is broken when the channel is full #11047 – Fix the issue that batch messages are too large in Raft client implementation #9714 pressure is too high. Refer to the solution in TiKV_channel_full_total. 378 7.5.3.2.2 TiKV_channel_full_total • Alert rule: sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • Description: Raftstore is too high, and it might be stuck already. • Solution: Refer to the solution in TiKV_channel_full_total. 7.5.3.2.6 TiKV_async_request_write_duration_seconds • Alert rule: histogram_quantile(0

the pressure is too high. Refer to the solution in TiKV_channel_full_total. 7.5.3.2.2 TiKV_channel_full_total • Alert rule: sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • Description: Raftstore is too high, and it might be stuck already. • Solution: Refer to the solution in TiKV_channel_full_total. 7.5.3.2.6 TiKV_async_request_write_duration_seconds • Alert rule: histogram_quantile(0 write takes a long time. • Solution: 1. Check the pressure on Raftstore. See the solution in TiKV_channel_full_total. 2. Check the pressure on the apply worker thread. 348 7.5.3.2.7 TiKV_coprocessor_request_wait_seconds

pressure is too high. Refer to the solution in TiKV_channel_full_total. 361 7.5.3.2.2 TiKV_channel_full_total • Alert rule: sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • Description: Raftstore is too high, and it might be stuck already. • Solution: Refer to the solution in TiKV_channel_full_total. 7.5.3.2.6 TiKV_async_request_write_duration_seconds • Alert rule: histogram_quantile(0 write takes a long time. • Solution: 1. Check the pressure on Raftstore. See the solution in TiKV_channel_full_total. 2. Check the pressure on the apply worker thread. 7.5.3.2.7 TiKV_coprocessor_request_wait_seconds

UPDATE statement gets panic #28078 – Fix the issue that INDEX HASH JOIN returns the send on closed channel error #31129 • TiKV – Fix the issue that the MVCC deletion records are not cleared by GC #11217 the pressure is too high. Refer to the solution in TiKV_channel_full_total. 7.5.3.2.2 TiKV_channel_full_total • Alert rule: sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • Description: Raftstore is too high, and it might be stuck already. • Solution: Refer to the solution in TiKV_channel_full_total. 473 7.5.3.2.6 TiKV_async_request_write_duration_seconds • Alert rule: histogram_quantile(0

检查远端 TiKV 是否挂掉。 3. 如果远端 TiKV 没有挂掉，检查压力是否太大，参考TiKV_channel_full_total 处理方法。 263 7.5.3.2.2 TiKV_channel_full_total • 报警规则： sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • 规则描述： 该错误通常是因为 type="snapshot"}[1m]))by (le, instance, type))> 1 • 规则描述： 这个值偏大，表明 Raftstore 负载压力很大，可能已经卡住。 • 处理方法： 参考TiKV_channel_full_total 的处理方法。 7.5.3.2.6 TiKV_async_request_write_duration_seconds • 报警规则： histogram_quantile(0 (le, instance, type))> 1 • 规则描述： 这个值偏大，表明 Raft write 耗时很长。 • 处理方法： 1. 检查 Raftstore 上的压力，参考TiKV_channel_full_total 的处理方法。 2. 检查 apply worker 线程的压力。 7.5.3.2.7 TiKV_coprocessor_request_wait_seconds •

不可用的问题。用户可通过关闭调度并重启出问 题的 TiKV 来临时应对。#10909 – 修复因 Congest 错误而导致的 CDC 频繁增加 scan 重试的问题 #11082 – 修复因 channel 打满而导致的 Raft 断连情况 #11047 – 修复 Raft client 中 batch 消息过大的问题 #9714 – 修复 resolved_ts 中协程泄漏的问题 #10965 检查远端 TiKV 是否挂掉。 3. 如果远端 TiKV 没有挂掉，检查压力是否太大，参考TiKV_channel_full_total 处理方法。 276 7.5.3.2.2 TiKV_channel_full_total • 报警规则： sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • 规则描述： 该错误通常是因为 type="snapshot"}[1m]))by (le, instance, type))> 1 • 规则描述： 这个值偏大，表明 Raftstore 负载压力很大，可能已经卡住。 • 处理方法： 参考TiKV_channel_full_total 的处理方法。 7.5.3.2.6 TiKV_async_request_write_duration_seconds • 报警规则： histogram_quantile(0

2. 检查远端 TiKV 是否挂掉。 3. 如果远端 TiKV 没有挂掉，检查压力是否太大，参考TiKV_channel_full_total 处理方法。 7.5.3.2.2 TiKV_channel_full_total • 报警规则： sum(rate(tikv_channel_full_total[10m]))BY (type, instance)> 0 • 规则描述： 该错误通常是因为 type="snapshot"}[1m]))by (le, instance, type))> 1 • 规则描述： 这个值偏大，表明 Raftstore 负载压力很大，可能已经卡住。 • 处理方法： 参考TiKV_channel_full_total 的处理方法。 7.5.3.2.6 TiKV_async_request_write_duration_seconds • 报警规则： histogram_quantile(0 (le, instance, type))> 1 • 规则描述： 这个值偏大，表明 Raft write 耗时很长。 • 处理方法： 1. 检查 Raftstore 上的压力，参考TiKV_channel_full_total 的处理方法。 2. 检查 apply worker 线程的压力。 7.5.3.2.7 TiKV_coprocessor_request_wait_seconds •

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aware Agenda Part I - Latency in scheduler ● The client consists of a goroutine and a channel ○ The channel batch the request ○ A goroutine run read-send-recv loop Background Description ● When the

Aurora Compare / Contrast / Combine Ed Huang, CTO @ PingCAP h@pingcap.com TiDB Community Slack Channel https://pingcap.com/tidbslack/ Compare Why Aurora? ● Amazon Aurora is popular ● Amazon Aurora Conclusion Thank You ! GitHub:github.com/pingcap/tidb Email: info@pingcap.com TiDB Community Slack Channel https://pingcap.com/tidbslack/