Обсуждение: why doesn't call XLogCheckInvalidPages during primary crash recovery?

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"王伟(学弈)"

Дата:

03 июля 2023 г., 13:11:51

Hi hackers,

Startup process will record not existed pages into hash table invalid_page_tab during replaying WAL.

And it would call XLogCheckInvalidPages after reaching consistent recovery state. Finally, it will

PANIC or WARNING based on parameter ignore_invalid_pages if where's any invalid pages.

Now I'm wondering why doesn't call XLogCheckInvalidPages during primary crash recovery?

When primary node crash recovery, the mini recovery point is InvalidXLogRecPtr, so it skips

consistent recovery state stage. Startup process get no chance to call XLogCheckInvalidPages

before exit.

In my opinion, invalid pages found in hash table invalid_page_tab means there's something

inconsistent between WAL and data. But why primary node can ignore it? Can anyone help

to answer?

Best regards,

rogers.ww