Reset lastOverflowedXid on standby when needed
Currently, lastOverflowedXid is never reset. It's just adjusted on new
transactions known to be overflowed. But if there are no overflowed
transactions for a long time, snapshots could be mistakenly marked as
suboverflowed due to wraparound.
This commit fixes this issue by resetting lastOverflowedXid when needed
altogether with KnownAssignedXids.
Backpatch to all supported versions.
Reported-by: Stan Hu
Discussion: https://postgr.es/m/CAMBWrQ%3DFp5UAsU_nATY7EMY7NHczG4-DTDU%3DmCvBQZAQ6wa2xQ%40mail.gmail.com
Author: Kyotaro Horiguchi, Alexander Korotkov
Reviewed-by: Stan Hu, Simon Riggs, Nikolay Samokhvalov, Andrey Borodin, Dmitry Dolgov
Branch
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REL9_6_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/7381b79ade479de5038ad924fbff1c584a0d6fee
Modified Files
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src/backend/storage/ipc/procarray.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)