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Set result.not_modified_since as minimum of last_written_lsn and replay lsn

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Konstantin Knizhnik
2024-05-17 17:17:52 +03:00
parent a8e6d259cb
commit d72aac0ad8
1 changed files with 6 additions and 2 deletions
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8
pgxn/neon/pagestore_smgr.c
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@@ -1528,9 +1528,13 @@ neon_get_request_lsns(NRelFileInfo rinfo, ForkNumber forknum, BlockNumber blkno)
{
/* Request the page at the last replayed LSN. */
result.request_lsn = GetXLogReplayRecPtr(NULL);
result.not_modified_since = last_written_lsn;
result.effective_request_lsn = result.request_lsn;
Assert(last_written_lsn <= result.request_lsn);
/*
* lastReplayedEndRecPtr is advanced after applying WAL record while
* last written LSN can be advanced while applying WAL record this is why
* last_written_lsn can be larger than GetXLogReplayRecPtr(NULL).
*/
result.not_modified_since = Min(last_written_lsn, result.request_lsn);
neon_log(DEBUG1, "neon_get_request_lsns request lsn %X/%X, not_modified_since %X/%X",
LSN_FORMAT_ARGS(result.request_lsn), LSN_FORMAT_ARGS(result.not_modified_since));