After successfully upgrading TiDB from v6.5.1 to v7.1.0 offline, the TiFlash service fails to start

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Original topic: Tidb v6.5.1 offline升级v7.1.0成功后,显示Tiflash服务无法启动

| username: cassblanca

[TiDB Usage Environment] Test
[TiDB Version] v6.5.1
[Reproduction Path] v6.5.1 offline upgrade to v7.1.0, upgrade successful.
[Encountered Issue: Problem Phenomenon and Impact] After the upgrade, when starting the cluster with tiup cluster start tidb-test, the Tiflash service failed to start during the process. However, display showed the service as normal, but subsequently, the alertmanager, grafana, and prometheus services did not start. During this period, the cluster was accessible, but Grafana could not be logged into. After checking the Tiflash error logs, no specific cause was found. Attempting to continue with an online upgrade tiup cluster upgrade tidb-test v7.1.1 resolved the issue, and all services could start normally.
[Resource Configuration] Navigate to TiDB Dashboard - Cluster Info - Hosts and take a screenshot of this page

[Attachments: Screenshots/Logs/Monitoring]

tiflash_error.log (57.9 KB)
tiup-cluster-debug-2023-07-29-13-18-16.log (44.5 KB)

| username: zhanggame1 | Original post link

There is indeed an issue with Tiflash starting up, but the logs are not very clear about what the problem is.

| username: Kongdom | Original post link

You can check the Linux logs, it should be in /var/log/message.

| username: redgame | Original post link

Check the path mentioned in the logs.

| username: system | Original post link

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