Encountering "table reader fetch next chunk failed" error in TiDB instance logs

This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: TIDB实例在日志中遇到table reader fetch next chunk failed报错

| username: 麻烦是朋友

[TiDB Usage Environment] Production Environment / Testing / Poc
[TiDB Version] V6.5.0
During routine system inspections, there is a “table reader fetch next chunk failed” error in the TIDB instance logs. The error details are as follows:
2024-03-19 09:53:36 (UTC+08:00) TiDB xxx.xx.xx.xxx:5003 [distsql.go:1331] [“table reader fetch next chunk failed”] [conn=3377941613086145857] [error=“loadRegion from PD failed, key: "748000000000004C0C5F72E9A7115E809C7944", err: rpc error: code = Canceled desc = context canceled”]
Should this error in the logs be a cause for concern?

| username: onlyacat | Original post link

It feels like an interaction timeout. How about checking the PD load during that time period or the network between TiDB and PD?

| username: GreenGuan | Original post link

Check the latency of PD and TiDB.

| username: TiDBer_rvITcue9 | Original post link

Check the network.

| username: xfworld | Original post link

It needs attention. It’s best to check which region this key’s data belongs to and see if there is any data loss in the region.

| username: buddyyuan | Original post link

I’ve encountered this error before; it usually occurs when the connection between the application and the database is interrupted.

| username: TiDBer_ok0VXN1s | Original post link

The latency between PD and TiDB has increased.