After an abnormal crash, the TiFlash node appears normal but is inaccessible

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

Original topic: 异常宕机后tiflash节点显示正常，但无法访问

| username: 人如其名

【TiDB Environment】POC
【TiDB Version】6.3.0
【Encountered Issue】ERROR 9012 (HY000): TiFlash server timeout
【Problem Phenomenon and Impact】

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image1380×664 111 KB

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image1475×438 13.5 KB

tiflash.log (9.0 KB) tidb.log (46.5 KB)

There are outputs on the tidb and tiflash nodes during execution, but there are no outputs in tiflash_tikv.log and tiflash_err.log, so I won’t upload them here.
Before TiFlash became inaccessible, all my virtual machines crashed abnormally. I rebuilt the PD nodes (from 3 to 1), and both tidb and tikv are normal. TiFlash has been working fine before, and there haven’t been any data loading or insertion operations for a long time. Could you please help me figure out what caused this issue?

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| username: xfworld | Original post link

You can first cancel the synchronization operation of the related tables in TiFlash, then scale down TiFlash, scale it up again, and re-establish the synchronization relationship to see if it works.