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If we set the all-visible flag after writing WAL record, and XLogInsert takes a full-page image of the page, the image would not include the flag. We will then proceed to set the VM bit, which would then be set without the corresponding all-visible flag on the heap page. Found by comparing page images on master and standby, after writing/replaying each WAL record. (There is still a discrepancy: the all-visible flag won't be set after replaying the HEAP_CLEAN record, even though it is set in the master. However, it will be set when replaying the HEAP2_VISIBLE record and setting the VM bit, so the all-visible flag and VM bit are always consistent on the standby, even though they are momentarily out-of-sync with master) Backpatch to 9.3 where this code was introduced. |
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